One of the things I've come to enjoy in these videos is the struggle to stay serious at the end when talking about how fun and cool the stuff is ! Awesome videos through and through
17:20 Oww fantastic video, even though I've discovered this 4 years after its making, I have learnt a fair bit. I'm aware we have 7w 450nm laser diodes readily available now, but that diode certainly took some amps. If your ever in the UK, give me a shout.
This is beautiful demonstration of the progress in the field of GaN diodes and your abilities to perform interesting tests with simple inexpensive materials and tools.
Not sure if you planned to have the colors of the meters to be different, but it helped me keep track of which meter was reporting what. Thanks for sharing this one with us. Very comprehensive test. :)
I like the contrast between having you tell in some other video to use safety goggles and other tricks not to have to watch directly a laser beam and you just casually putting a metalic ruler in a 4W beam to measure it without even using goggles :P (and lets not even mention the whole "sending that 4w laser beam accross the room at eye level")
Thanks! And yes, you do! Have no misconceptions about our workload here. We fit all of this into already busy schedules. Our motivation for this channel's growth is to allow us to shift our priorities somewhat.
is this the defective diode test..as i found your post. The bad news is the video I did was with a bad diode. The good news is the diode he sent performs as I had hoped and like most of the other testers have measured. At 600mA, I was already getting 600mW. By 1,100mA, I saw 1,500mW. At 2,000mA, the diode was producing 3,200mW. The maximum power was 7,100mW at 5,100mA. After this, the power began to drop with additional current. The beam was better as well. With a 5x cylinder pair the beam at 30cm from the collimator was 7mm high and 3mm wide and at 14M the beam was 16mm high and 6mm wide.
When I saw the metal ruler nearing the laser beam I instinctively narrowed my eyes. My reptilian brain is so cute when it wants to protect me from things it doesn't understand.
I have an older CO2 Metal Tube Laser and have a couple of questions. Great videos by the way, thanks. 1. Is there an economical way to determine the actual output of the laser with instruments found around a hobbyist garage \ shop? The laser is marked as a 75 Watt. I just do NOT know how "used up" the laser tube actually is. My yellow focusing lens appears scarred. 2. Who would you recommend purchasing quality lenses from or am I somewhat safe to just purchase the least expensive one I can find? 3. How do I go about determining its specifications and if there is any changes that can be made to enhance its power output?
There is an easy way. Basically, you need to insulate a small quantity of water with some way to measure it's tempreture. 10.6um CO2 laser light is absorbed by water. Defocus the beam so that you don't get a tiny boiling spot, expose the water for a fixed time and measure the temp rise. 4.2J/cc/C.
Have you ever heard of a Laser Power Supply from Spectra Physics called Silent Light? My father designed that. He's also responsible for making it obsolete with his design while working at Coherent.
I love the guys from SP ! Back in the 80's my first Laser (a 100cm HeNe tube) was broken and these guys helped me for free to fix it ! These times this Laser was round about 10.000$ ! Good old times Hope your dad is still alive and well !
not complaining, but you might want to consider a mic, i got a 99 cent mic online and was blown away at how much it helped eliminate the background hiss and noise
so the divergence of a larger beam cross section is better than a smaller one right,,or did you say you managed to improve div without changing the beam size??
Could you grind glass to correct the aberration? I’m sure you can but is there a formula for using the geometry of the spot it makes to come up with a shape that will make it a perfect dot?
People have to earn a sub from me these days, subbed I'm stupid in comparison to you but your brain is very interesting, your a smart man. And just by watching I am getting slightly smarter, although I don't understand some of what you do, I love learning things and you explain things really well. I'm guessing your a science lecturer. Keep up the good work!..
Any chance you could build and demonstrate a homemade Raman Mass spectrometer? I’ve seen a few DIY videos on CZcams, but I’m convinced you guys could do a much better job. One of the videos shows a paper written by a Brazilian scientist regarding how to do it.
but the mirrors you are using i assume are not perfect laser grated and will reflect the beam with a percentage of expansion or diffraction with some losses due to absorption and scattering not to mention the angle they are set might also change the cross section shape ,,it depends i guess what you are doing
I can tell that this is what you did for a living. My brother briefly worked with lasers for bausch and lomb designing some type of mammography device.
@Eddie Hitler still i believe the angling of the mirrors if done improperly will distort the cross section changing the axis waist but i think because the lasing medium is so small in diodes this is the reason they produce poor emitted beams if not properly fixed by collimation , i still never understood why the size of the medium would play such a negative roll though ,they say the bigger or longer the better the output beam quality
How did you arrive at comparing watts to amps? You could look for a flattening in the response of watts vs.amps, but you refer to a crossover which implies a direct comparison of amps to watts. Somewhere there must be 1 volt in the calculations.
Because these are current limited devices, the driver supplies "suffecient" voltage to drive the selected current. Voltage times current can be used to determine power used and from that a relative effeciency vs laser power can be calculated. But, the current is the primary reference that is often quoted when evaluating the capacity of a diode laser.
Seeing the laser frequency change made me wonder again if beat frequencies apply to light the way they do for sound. In other words, if you had two lasers tuned 300KHz differently, could you listen to them interfere on AM radio?
@@TechIngredients nice... I’ve been watching a lot of your videos and learning a lot from you. I love rocketry but I haven’t gotten into the composite rocketry just black powder.
I think the phaser locks are too small and should use a letter "C" drill bit to enlarge them, along with boosting the wattage by circumventing the impulse buffer?
Interesting. Are you using the diodes in laser projectors for light shows? Had the privilege last summer to work with an outfit out of Seattle to put on an independance day show in Longview WA. The company builds their own laser projectors and combines beams to build projectors with 15, 20, and 25 Watts of optical power of combined RGB light.
i am looking to build a simple tungsten halogen lamp pumped cw laser,,very little info on this but it has been done,wondering if this would be a good challenge build for you and i would like a visible beam so def use of a ktp or sgh would be nice,,i am wondering if there is a simpler way of using some kind of dye or liquid medium instead of multiple crystals and optics that would lase visibly being matched to the absorption emission of the TH lamp or perhaps another solid state matter not yet tried?,,what do you think of a cooper plating solution(green emission) or lead for red emission as a laser medium perhaps pumped by electrolysis or some kind of liquid or gel medium that can be directly pumped by RF or discharge would this be electrochemiluminescent ?
this material might actually be what im looking for to make a simple laser,there seems to be advances made on something called SFD (self frequency doubling) crystal www.sciencedirect.com/science/article/pii/S235284781500091X
Tungsten lamps are not as effective as arc lamps for generating the near IR light that neodinum needs for pumping. It's possible, but it will be a struggle to get significant power output.
@@TechIngredients it can get suitable results for me,be it 10's mW or a few Watts,,i already built the pumping array using 4x500w th lamps and it is more effective for me because there is no expensive and complicated lamps and trigger circuits or driver ,this is the crudeness i like to be able to build a laser as simple as possible ,it will be a beast to operate usinfg forced air or water cooling,,,problem is getting the rod and shg crystal and mirrors cheaply and built on an optical train,,if its possible to pump only one medium and get a visible beam with my lamps then id prefer that ,,right now id love to see someone making a video of such a simple th lamp pumped nd:yag or nd:glass--> freq doubled laser ,ive seen non out there aside from little reading articles,,would be an awesome achievement for someone like you with the means to build one as an example for me to follow and get ideas from,it has been my childhood dream to build a working laser but i do not have the confidence unless it is porven and is a simpl,e design before i go out ordering parts not found in stores,so if its possible to make this thing as simple as possible with substitute parts if possible then id love to see it ,,i would think for someone like you it would be a very interesting challenge to create a laser beam pumped by a crude tungsten hallogen lamp
i wonder if we have an ionic copper solution we might possibly be able to lase it via flash or arc lamp? or direct discharge,,perhaps if the ions are suspended in solution of alcohol or distilled water where only the ions will act as a carrier,perhaps copper vapor can be trapped in the solution or other metals that can lase or combination
The divergence has me hoping blu ray disk don't go the way go the dinosaur in favor of static/chip memory too soon. I would like to see a true 2w 405nm single mode at bargain prices via mass production so that I can knife edge and stack a gaggle of em.
if i bought a good diode,,what is the simplest crudest driver i can put together juts to make it run ,forget about regulation or power variable etc ,something like a battery and resistor or 12vac-->dc?and of course a heat sink and fan but so long as it runs safely,,can ya help?
At 4 watts you're in the instantly vaporized retina territory. Even the scatter from the beam hitting objects in the room is dangerous at this point. This is incredibly dangerous to do without eye protection.
U cant just parallel up some drivers , u need to current share , also pwm ing the diode in this arrangment is not a good idea because the peak current might destroy the diode
Yeah, you’ll be able to buy a 10 watt blue for 40$ on eBay, it’ll ship with junk batteries, but for the first 20 seconds you’ll have a hand held retina-sketch
Watch out, some manufacturers actually tell you the electrical power instead of optical power. 15W 450nm is very unlikely optical power, unless the module combines multiple diodes, which is not cheap at all.
@@WoodenWeaponry The puzzling thing is that there are 5W lasers and 7.5W lasers (optical power). Yet, I did not see anywhere that one of 7.5W to buy separately. They have beam combiner with polarizing prism, but then two 5W lasers can give only 10W optical power out. I am not fan of engraving or cutting with blue lasers... good old CO2 lasers gives me enough power for what I need. Yet, blue lasers are intriguing at least.
Physically impossible. You can't limit the light path without an obstruction. It feels more like having a bolt of infinite light in your hands. Pretty cool though.
@@AtmelKiller That is not true. You could in theory make a limited length laser beam by overlapping multiple laser frequencies using furrier transformation. You would need a lot of different frequencies though, to get near to 0 laser strength beyond the termination distance. The termination is achieved by destructive interference of the different frequencies beyond the termination distance. We can already do similar stuff with sound, where it's much easier to generate difference frequencies. Not sure if we actually could do that with lasers using current technology, but it should be possible in theory.
I was wondering if the laser burns, your reaction when the beam hit your hand says enough... you're gambling with your eye sight not wearing any goggles man!!
Dumb question, even when using adequate cooling I find diodes simply can't be left on for extended periods without burning out...any ideas? I'm coming from helium neon lasers that can be left on all day but have much lower power outputs...
Diode lasers can operate for thousands of hours. The heat removal from such a very small source can be difficult and often is not done well. I recommend indium metal foil as a thermal interface material. It never drys out and has an order of magnitude better thermal transfer from the start. Large passive heat sinks that don't depend on fans (which break) is another long term investment.
They were produced with a video camera, a nice one but with an integral mic. When we started this channel, the purpose was to produce a few laser related videos to support discussions on a couple of laser forums. We didn't give production quality as much attention as we do now.
So for what its worth there is a surprising amount of difference in the performance of different CPU coolers. I don't know why, it shouldn't be the case, but it does seem to be so. Also a good fan should produce a similar level of cooling but far less noise, with the better fans running $10-15. But that said if you are able to then multiple cheap CPU heatsinks will likely be more bang for your buck at a cost of complexity, noise, and size. Unfortunately that isn't possible for CPUs, though they do offer what amounts to twin heatsinks with two fans like the Noctua NH-D15 I'm currently running. Honestly though I regret it a little, it works great but its far more than I need and it took hours to gut my computer and replace fans so I could simply fit the large heatsink at all, but for a laser it would be a great (albeit pricey) solution and comes with decent quality fans. Not my favorite, but among the leading edge and certainly the favorite fans of a lot of people.
Soon, we will be posting a video on a very efficient solid state refrigerator using some of these higher performance peltier devices. You might find it interesting.
Ever heard of blue light damage, to your eyes? It's like becoming permanently blind but only on parts of your retina. If you make a few more videos like this, you might not be able to see well enough to make more.
It's so simple, it's not worth a full video. Aluminum foil of any thickness within the walls, ceiling and floor will completely block microwave transmission. Glass with a clear, electrically conductive coating will block transmission through the windows. The individuals will loose wireless connectivity from outside the building, but this is easily solved with wireless transmission from repeaters within the building. This last solution can also help with security from hacking.
I actually went to college with this guy. In fact... I have a video of our final/dissertation, which we worked on together. It was a laser... check it out: czcams.com/video/0ds0wYpc1eM/video.html
The copper mount you put the diode in, is it oxygen free copper? I used to make mounts for nasa that went in satelites positioning systems and they always had to be made from oxygen free copper bullet due to its thermal dynamics and that it would be used in vacuumed containers as well. We also used the same copper in partical accelerator componants. Even a single fingerprint took days to Gas off in a vacuum but I remember it also had thermal properties.
I'm a bit curious why you are not wearing eye safety or perhaps shades resistant to the laser. More of a question about the need for them than questioning your judgement. Most interesting project.
Hard to say because there are so many kinds of lasers such as high average power, peak power, coherence length, wavelength, divergence etc. But, why compete it's all good.
@@TechIngredients he also showed q switch , and air blasting Ruby laser . By the way .....there is already on going competition between Other big channels to prove each other wrong or right like contents of veritasium on two parallel cable , funny fight between electroboom great Scott and Steve etc it's so funny 😀
I fail to understand how safety glasses are safe when you're working with lasers than can burn and they block the light so you literally cannot see a shred of what is being emitted.
@@timramich Hmm. I would be surprised if you couldn't see anything from a laser at that level of power, but I don't know. I have a pair of cheap laser goggles, but have not actually used (or more to the point) tested them. I could be wrong, but it seems like a step in the right direction to me.
He discussed safety in another video, and showed two pairs of goggles, number 6 and number 9. The number 6 reduce the laser frequency light by 10^6 power, and the number 9 reduce by 10^9 power. He was not able to see the beam with the goggles, and discussed the problem. My bad!
i thought it was rated at 7w? if you look at this vid he drives it up to 6.5w czcams.com/video/jyHxzgl8j9M/video.html can you please give details about this diode and what is found inside? is there sgh or opo crystal or just a diode producing blue instead of red?
@Eddie Hitler i remember when they said how hard it was making other colors like green because it needs crystals but i bet if they can make straight blue then they can find materials to produce all the colors in a simple diode, i always figured they can make blue simply using the pump diode directly onto the ktp crystal
One of the things I've come to enjoy in these videos is the struggle to stay serious at the end when talking about how fun and cool the stuff is ! Awesome videos through and through
Another great video. Thanks for the time and effort you put into these videos to share with us.
I love this channel. Thank you for all the great knowledge!
17:20 Oww fantastic video, even though I've discovered this 4 years after its making, I have learnt a fair bit. I'm aware we have 7w 450nm laser diodes readily available now, but that diode certainly took some amps. If your ever in the UK, give me a shout.
This is beautiful demonstration of the progress in the field of GaN diodes and your abilities to perform interesting tests with simple inexpensive materials and tools.
amazing as always.. keep posting these vids and give us tips and tricks on everything about lasers! thanks
Just recently found this channel. Keep it up! I find all this content very interesting.
Not sure if you planned to have the colors of the meters to be different, but it helped me keep track of which meter was reporting what. Thanks for sharing this one with us. Very comprehensive test. :)
I like the contrast between having you tell in some other video to use safety goggles and other tricks not to have to watch directly a laser beam and you just casually putting a metalic ruler in a 4W beam to measure it without even using goggles :P (and lets not even mention the whole "sending that 4w laser beam accross the room at eye level")
That's a good point. I stand chastised.
Their just eye balls, you cant possible need both of them.
Practice what you teach!
Just remember, don't look into the beam with remaining good eye.
pcrengnr1 Pew di pie made me cringe when he ordered a blue laser pen off the web and was playing around with it....
Very interesting as usual ! Thanks
Highly usefull and very informative.. definately learning a lot.. thanks..
I love this guy!!! I wish I had the time to tinker like this!
Thanks! And yes, you do!
Have no misconceptions about our workload here. We fit all of this into already busy schedules. Our motivation for this channel's growth is to allow us to shift our priorities somewhat.
This is not 'tinkering'. The science behind every action is well thought out! The results are predictable!
Great analysis, thank you.
Looks like you haven't posted much recently. I hope you are well!
is this the defective diode test..as i found your post.
The bad news is the video I did was with a bad diode. The good news is the diode he sent performs as I had hoped and like most of the other testers have measured. At 600mA, I was already getting 600mW. By 1,100mA, I saw 1,500mW. At 2,000mA, the diode was producing 3,200mW. The maximum power was 7,100mW at 5,100mA. After this, the power began to drop with additional current.
The beam was better as well. With a 5x cylinder pair the beam at 30cm from the collimator was 7mm high and 3mm wide and at 14M the beam was 16mm high and 6mm wide.
I feel as though I’m standing in a pit and everything you’ve shown is just going over my head. A truly humbling experience.
That's weird... I understood everything he said.
jjhack3r I guess that some people are much smarter than others.
@@pierdolio I wouldn't consider it to be intelligence.
jjhack3r I guess you’re right. Maybe it’s just stupidity.
@@pierdolio thats not what I meant, but ok.
4Watts.. interesting... Diode might be deffective.. can't wait for more info if that is the case here.
I love your videos planters, very informative.
Excellent presentation.
GENIUS!!!
When I saw the metal ruler nearing the laser beam I instinctively narrowed my eyes. My reptilian brain is so cute when it wants to protect me from things it doesn't understand.
Nah man, you just have good survival instincts. 4 watts of 450nm will fry your retinas in a millisecond...
I was scared too! Then I remembered
thank you. Very interest.
I have questions. This is awesome!
I have an older CO2 Metal Tube Laser and have a couple of questions.
Great videos by the way, thanks.
1. Is there an economical way to determine the actual output of the laser with instruments found around a hobbyist garage \ shop? The laser is marked as a 75 Watt. I just do NOT know how "used up" the laser tube actually is.
My yellow focusing lens appears scarred.
2. Who would you recommend purchasing quality lenses from or am I somewhat safe to just purchase the least expensive one I can find?
3. How do I go about determining its specifications and if there is any changes that can be made to enhance its power output?
There is an easy way. Basically, you need to insulate a small quantity of water with some way to measure it's tempreture. 10.6um CO2 laser light is absorbed by water. Defocus the beam so that you don't get a tiny boiling spot, expose the water for a fixed time and measure the temp rise. 4.2J/cc/C.
There is a new type of ceramic heat sink developed in Japan that you might want
to check out. Keep the videos coming.
Have you ever heard of a Laser Power Supply from Spectra Physics called Silent Light? My father designed that. He's also responsible for making it obsolete with his design while working at Coherent.
I had not, interesting.
I love the guys from SP !
Back in the 80's my first Laser (a 100cm HeNe tube) was broken and these guys helped me for free to fix it !
These times this Laser was round about 10.000$ !
Good old times
Hope your dad is still alive and well !
Check out styropyro’s new video, he jams a 100 watt blue diode laser into an old cop speed gun to produce an incredibly powerful hand held laser.
Always great content
not complaining, but you might want to consider a mic, i got a 99 cent mic online and was blown away at how much it helped eliminate the background hiss and noise
This was one of our early videos. Our mic and our cameras have come a long way since the.
so the divergence of a larger beam cross section is better than a smaller one right,,or did you say you managed to improve div without changing the beam size??
I really like the new 488nm Diodes from Sharp, although they are rather low in power. But the quality and visibility is excellent.
Awesome a Modest Mouse fan!
cool lab i wish i had one
Could you grind glass to correct the aberration? I’m sure you can but is there a formula for using the geometry of the spot it makes to come up with a shape that will make it a perfect dot?
Yes you can and as long as the aberration is relatively simple, this will work.
keep seeing this diode running hand held lasers at 7w and even 15w for module engravers
Intro makes me want to float on.
The brain in this man's head is....astounding!
People have to earn a sub from me these days, subbed I'm stupid in comparison to you but your brain is very interesting, your a smart man.
And just by watching I am getting slightly smarter, although I don't understand some of what you do, I love learning things and you explain things really well.
I'm guessing your a science lecturer.
Keep up the good work!..
what about the NICHIA NUBM34 455nm 115W Multiple Blue Laser Diode Chip Array ?
Any chance you could build and demonstrate a homemade Raman Mass spectrometer? I’ve seen a few DIY videos on CZcams, but I’m convinced you guys could do a much better job. One of the videos shows a paper written by a Brazilian scientist regarding how to do it.
to prevent laser reflecting to itself, make its out optics a prism, it will bend it 90 degrees but will solve that issue.
Wouldn't a reflection make the same 90 degree bend back into the laser?
One of these things might protect your diode: en.wikipedia.org/wiki/Optical_isolator
...and some diamond heat sink compound.
but the mirrors you are using i assume are not perfect laser grated and will reflect the beam with a percentage of expansion or diffraction with some losses due to absorption and scattering not to mention the angle they are set might also change the cross section shape ,,it depends i guess what you are doing
Very knowledgeable man. No question. Safety is not top priority ! SAFETY SMAFTEY ! Pffftt
Pretty cool, but styropyro would have set all kinds of stuff on fire with it.
I can tell that this is what you did for a living. My brother briefly worked with lasers for bausch and lomb designing some type of mammography device.
Actually, it isn't. But I've enjoyed working with them for many years.
@@TechIngredients What was your career?
i assume the spot got bigger over such a short distance due to the mirrors at an angle playing with the beam cross section shape as well
@Eddie Hitler still i believe the angling of the mirrors if done improperly will distort the cross section changing the axis waist but i think because the lasing medium is so small in diodes this is the reason they produce poor emitted beams if not properly fixed by collimation , i still never understood why the size of the medium would play such a negative roll though ,they say the bigger or longer the better the output beam quality
How did you arrive at comparing watts to amps? You could look for a flattening in the response of watts vs.amps, but you refer to a crossover which implies a direct comparison of amps to watts. Somewhere there must be 1 volt in the calculations.
Because these are current limited devices, the driver supplies "suffecient" voltage to drive the selected current. Voltage times current can be used to determine power used and from that a relative effeciency vs laser power can be calculated. But, the current is the primary reference that is often quoted when evaluating the capacity of a diode laser.
IPG photonics sells 100W fiber coupled diodes but they're IR
5 year old video pal
@@ASCENDANTGAMERSAGE5 year old video ntsc
your power meter is set to 650nm ?
Seeing the laser frequency change made me wonder again if beat frequencies apply to light the way they do for sound. In other words, if you had two lasers tuned 300KHz differently, could you listen to them interfere on AM radio?
You could.
This is one of the more flexible methods for generating terahertz radiation and it's widly used.
Modest mouse intro, cool!
Heard of the Liquid Metal Battery?
Raman spectrometer, please!! :-)
Would it be possible to add a Wireless Mike to your equipment? It will help the low audio in your videos greatly.
We started to do that about two years ago. This is an older video.
I learned something new
sooooooooooooooo WHERE ARE YOUR GLASSES??????????????????
On his face duh, :p though I don't think they would attenuate the beam at all
Serious question: what did/do you do for a living? I'm genuinely curious
Retired MIT professor, I think.
@@Vir9il Professor of what? He's got too much of both depth and breadth, I can't put him in a pigeonhole. Experimental physics?
On the other hand, he thinks in inches and then converts. Probably engineering rather than physics.
Final thought: it was ambitious eager assholes like this that landed a man on the Moon. Really cool channel.
@@Vir9il Alan Guth? en.wikipedia.org/wiki/Alan_Guth
i had to adjust all my mirrors in my laser cutter and i almost lost my mind.
Modest Mouse for the lead-up music hahaha
Could you build a mini v1 buzz bomb. That would be cool to see a pulsating engine in action in a small model.
We have one. It isn't really very mini. 😙 We'll demonstrate it when the weather improves.
@@TechIngredients nice... I’ve been watching a lot of your videos and learning a lot from you. I love rocketry but I haven’t gotten into the composite rocketry just black powder.
I wonder if you measured the efficiency of the diode.
He's not held back by annoying props such as safety glasses.
I think the phaser locks are too small and should use a letter "C" drill bit to enlarge them, along with boosting the wattage by circumventing the impulse buffer?
Interesting. Are you using the diodes in laser projectors for light shows? Had the privilege last summer to work with an outfit out of Seattle to put on an independance day show in Longview WA. The company builds their own laser projectors and combines beams to build projectors with 15, 20, and 25 Watts of optical power of combined RGB light.
Absolutely.
Have you checked out our earlier videos on high-performance, powerful laser projectors?
i am looking to build a simple tungsten halogen lamp pumped cw laser,,very little info on this but it has been done,wondering if this would be a good challenge build for you and i would like a visible beam so def use of a ktp or sgh would be nice,,i am wondering if there is a simpler way of using some kind of dye or liquid medium instead of multiple crystals and optics that would lase visibly being matched to the absorption emission of the TH lamp or perhaps another solid state matter not yet tried?,,what do you think of a cooper plating solution(green emission) or lead for red emission as a laser medium perhaps pumped by electrolysis or some kind of liquid or gel medium that can be directly pumped by RF or discharge would this be electrochemiluminescent ?
this material might actually be what im looking for to make a simple laser,there seems to be advances made on something called SFD (self frequency doubling) crystal www.sciencedirect.com/science/article/pii/S235284781500091X
Tungsten lamps are not as effective as arc lamps for generating the near IR light that neodinum needs for pumping. It's possible, but it will be a struggle to get significant power output.
@@TechIngredients it can get suitable results for me,be it 10's mW or a few Watts,,i already built the pumping array using 4x500w th lamps and it is more effective for me because there is no expensive and complicated lamps and trigger circuits or driver ,this is the crudeness i like to be able to build a laser as simple as possible ,it will be a beast to operate usinfg forced air or water cooling,,,problem is getting the rod and shg crystal and mirrors cheaply and built on an optical train,,if its possible to pump only one medium and get a visible beam with my lamps then id prefer that ,,right now id love to see someone making a video of such a simple th lamp pumped nd:yag or nd:glass--> freq doubled laser ,ive seen non out there aside from little reading articles,,would be an awesome achievement for someone like you with the means to build one as an example for me to follow and get ideas from,it has been my childhood dream to build a working laser but i do not have the confidence unless it is porven and is a simpl,e design before i go out ordering parts not found in stores,so if its possible to make this thing as simple as possible with substitute parts if possible then id love to see it ,,i would think for someone like you it would be a very interesting challenge to create a laser beam pumped by a crude tungsten hallogen lamp
@@TechIngredients then perhaps another medium that is more suited to the emissions of the th lamp? there are countless out there other than nd:XX
i wonder if we have an ionic copper solution we might possibly be able to lase it via flash or arc lamp? or direct discharge,,perhaps if the ions are suspended in solution of alcohol or distilled water where only the ions will act as a carrier,perhaps copper vapor can be trapped in the solution or other metals that can lase or combination
Would this blue light be any good for growing
It would, but the output per dollar is substantially lower than a standard LED with a red and blue optimized spectrum.
But will it shoot down a ICBM?
We haven't tried.
The divergence has me hoping blu ray disk don't go the way go the dinosaur in favor of static/chip memory too soon. I would like to see a true 2w 405nm single mode at bargain prices via mass production so that I can knife edge and stack a gaggle of em.
if i bought a good diode,,what is the simplest crudest driver i can put together juts to make it run ,forget about regulation or power variable etc ,something like a battery and resistor or 12vac-->dc?and of course a heat sink and fan but so long as it runs safely,,can ya help?
@Eddie Hitler ok ty
Wear some damn Goggles Man.
At 4 watts you're in the instantly vaporized retina territory. Even the scatter from the beam hitting objects in the room is dangerous at this point. This is incredibly dangerous to do without eye protection.
@@killrb13 LED laser scattered reflection is not considered harmful.
@@BigMac2222
Dude, wtf?!
@@BigMac2222 Wrong in so many ways.
onehit pick you can literally look it up
badass haventseenapeltiercooler in a while
True, but current work on quantum dot lasers may use them for temperature control. We'll see.
That song in the beginning was awesome. What was the band, dashboard?
I believe it's Float On by Modest Mouse.
U cant just parallel up some drivers , u need to current share , also pwm ing the diode in this arrangment is not a good idea because the peak current might destroy the diode
this
WOW, five years later, and I have small, 5 W blue laser. And, I have plan to buy 15W 450 nm one. What will be in next 5 years?
Yeah, you’ll be able to buy a 10 watt blue for 40$ on eBay, it’ll ship with junk batteries, but for the first 20 seconds you’ll have a hand held retina-sketch
Watch out, some manufacturers actually tell you the electrical power instead of optical power. 15W 450nm is very unlikely optical power, unless the module combines multiple diodes, which is not cheap at all.
@@WoodenWeaponry The puzzling thing is that there are 5W lasers and 7.5W lasers (optical power). Yet, I did not see anywhere that one of 7.5W to buy separately. They have beam combiner with polarizing prism, but then two 5W lasers can give only 10W optical power out. I am not fan of engraving or cutting with blue lasers... good old CO2 lasers gives me enough power for what I need. Yet, blue lasers are intriguing at least.
Is it almost possible to get a working Luke sky walker laser sword? I've wanted once since childhood.
Physically impossible. You can't limit the light path without an obstruction. It feels more like having a bolt of infinite light in your hands. Pretty cool though.
I know, I was kidding but a man can dream. They also said it would be impossible to go to the moon.
Maybe one day! Lol
@@AtmelKiller That is not true. You could in theory make a limited length laser beam by overlapping multiple laser frequencies using furrier transformation. You would need a lot of different frequencies though, to get near to 0 laser strength beyond the termination distance. The termination is achieved by destructive interference of the different frequencies beyond the termination distance. We can already do similar stuff with sound, where it's much easier to generate difference frequencies.
Not sure if we actually could do that with lasers using current technology, but it should be possible in theory.
So you can see the beam OWW
I was wondering if the laser burns, your reaction when the beam hit your hand says enough... you're gambling with your eye sight not wearing any goggles man!!
he knows what he is doing with lasers
Dumb question, even when using adequate cooling I find diodes simply can't be left on for extended periods without burning out...any ideas? I'm coming from helium neon lasers that can be left on all day but have much lower power outputs...
Diode lasers can operate for thousands of hours. The heat removal from such a very small source can be difficult and often is not done well. I recommend indium metal foil as a thermal interface material. It never drys out and has an order of magnitude better thermal transfer from the start. Large passive heat sinks that don't depend on fans (which break) is another long term investment.
@@TechIngredients perfect, thank you for the thorough reply!
hes brave not wearing goggles
Would be cool if I could actually hear anything in this video.
8:10 4.20 folks. Pause the video and meet me out back...
What can you use a laser like this for?
These are primarily for display systems.
@@TechIngredients Thanks!
What’s about the sound on these old videos?
They were produced with a video camera, a nice one but with an integral mic. When we started this channel, the purpose was to produce a few laser related videos to support discussions on a couple of laser forums. We didn't give production quality as much attention as we do now.
Noise level ‼️💢
Modest mouse. 🎶
put it under a vacuum and extend the copper down to l nitrogen
Perhaps you can fix the audio.
5 year old video pal
Sage King yeah but perhaps an updated video would be good. Love the content
It's an excimer!
Optically pumped diodes will produce tens of watts without breaking a sweat. Theoretically hundreds of watts under lab conditions.
So for what its worth there is a surprising amount of difference in the performance of different CPU coolers. I don't know why, it shouldn't be the case, but it does seem to be so. Also a good fan should produce a similar level of cooling but far less noise, with the better fans running $10-15. But that said if you are able to then multiple cheap CPU heatsinks will likely be more bang for your buck at a cost of complexity, noise, and size. Unfortunately that isn't possible for CPUs, though they do offer what amounts to twin heatsinks with two fans like the Noctua NH-D15 I'm currently running. Honestly though I regret it a little, it works great but its far more than I need and it took hours to gut my computer and replace fans so I could simply fit the large heatsink at all, but for a laser it would be a great (albeit pricey) solution and comes with decent quality fans. Not my favorite, but among the leading edge and certainly the favorite fans of a lot of people.
Soon, we will be posting a video on a very efficient solid state refrigerator using some of these higher performance peltier devices. You might find it interesting.
Ever heard of blue light damage, to your eyes? It's like becoming permanently blind but only on parts of your retina. If you make a few more videos like this, you might not be able to see well enough to make more.
CC helps...
Design something to protect diplomats from the microwave attacks, at least a warning device.
It's so simple, it's not worth a full video. Aluminum foil of any thickness within the walls, ceiling and floor will completely block microwave transmission. Glass with a clear, electrically conductive coating will block transmission through the windows. The individuals will loose wireless connectivity from outside the building, but this is easily solved with wireless transmission from repeaters within the building. This last solution can also help with security from hacking.
@@TechIngredients So a Radom type badge is not feasible, that would the mv.
Think of microwaves like light, you can't block it with an incomplete barrier.
Do you watch StyroPyro?
Oh, sure.
I actually went to college with this guy. In fact... I have a video of our final/dissertation, which we worked on together. It was a laser... check it out:
czcams.com/video/0ds0wYpc1eM/video.html
The copper mount you put the diode in, is it oxygen free copper? I used to make mounts for nasa that went in satelites positioning systems and they always had to be made from oxygen free copper bullet due to its thermal dynamics and that it would be used in vacuumed containers as well. We also used the same copper in partical accelerator componants. Even a single fingerprint took days to Gas off in a vacuum but I remember it also had thermal properties.
Oxygen free copper has higher thermal conductivity. A lot of very high power diores are now moving to CVD diamond heat spreaders.
I respect your knowledge but playing with class 4 laser without proper eye protection???
I'm a bit curious why you are not wearing eye safety or perhaps shades resistant to the laser. More of a question about the need for them than questioning your judgement. Most interesting project.
Can you beat styropyro in laser 😄
Hard to say because there are so many kinds of lasers such as high average power, peak power, coherence length, wavelength, divergence etc.
But, why compete it's all good.
@@TechIngredients he also showed q switch , and air blasting Ruby laser .
By the way .....there is already on going competition between Other big channels to prove each other wrong or right like contents of veritasium on two parallel cable , funny fight between electroboom great Scott and Steve etc it's so funny 😀
Nice videos, would have preferred metric values though.
grab a calculator..
I fail to understand how safety glasses are safe when you're working with lasers than can burn and they block the light so you literally cannot see a shred of what is being emitted.
Yellow laser goggles block the blue light effectively. They are not just dark glasses.
@@firstmkb I know they are not dark glasses. But from what I understand, you cannot see ANYTHING the laser emits.
@@timramich Hmm. I would be surprised if you couldn't see anything from a laser at that level of power, but I don't know. I have a pair of cheap laser goggles, but have not actually used (or more to the point) tested them. I could be wrong, but it seems like a step in the right direction to me.
He discussed safety in another video, and showed two pairs of goggles, number 6 and number 9. The number 6 reduce the laser frequency light by 10^6 power, and the number 9 reduce by 10^9 power. He was not able to see the beam with the goggles, and discussed the problem. My bad!
i thought it was rated at 7w? if you look at this vid he drives it up to 6.5w czcams.com/video/jyHxzgl8j9M/video.html
can you please give details about this diode and what is found inside? is there sgh or opo crystal or just a diode producing blue instead of red?
@Eddie Hitler i remember when they said how hard it was making other colors like green because it needs crystals but i bet if they can make straight blue then they can find materials to produce all the colors in a simple diode, i always figured they can make blue simply using the pump diode directly onto the ktp crystal