THE ISSUE WITH GREEN LASER POINTERS
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- čas přidán 4. 08. 2018
- Some green laser pointers not only emit a bright green beam but also invisible radiation at a hazardous level!
How do we make invisible radiation visible and how do you test your laser for this? Let's find out!
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Hi! Thanks for all the questions on this video. Here's the follow-up video czcams.com/video/r3V5PzTDP7E/video.html where I answer some of your questions:
- Is it really invisible, when the 808 nm is so visible to the camera?
- Is the infrared a problem, if I just avoid the green beam hiding the infrared?
- Will safety glasses protect against the infrared beam?
you're music is awesome!
so can you give us links to some cheaper but with IR light filter lasers or can we just tape one on laser itself
I was thinking that might be a way to deal with some lighting effect projectors that have green lasers in them that may or may not be safe..
XM360 sent me here ... and now you have a new sub :-)
Er du fra Danmark. Det lyder sådan på din accent
I have a spot on my retina of my right eye (not central to my vision thank god, it’s off in my peripheral vision) from one of these cheap green lasers.
It was rated at 10mW, but it was actually 330mW (measured at a laser lab a friend had access to) and it emitted most of that in the IR spectrum. It burned my retina through green laser safety goggles faster than I could blink, and was only partially reflected off a glass cup.
Heed this man’s warnings, buy only quality lasers and eye protection, and don’t play around with them, I learned my lesson the hard way.
Good to know it wasn't in the center of your retina, but still a clear example of the seriousness of this issue. Thanks for sharing your story.
My "
soupisgdfood:
I recall popular CZcamsr "PHOTONICINDUCTION" was playing with lasers and accidentally burned his camera's image sensor. So lucky it wasn't his mate's eye. A classic reminder of this accident is his MANY subsequent videos in which WE SEE DEAD SPOTS IN THE IMAGE! The guy is a pro, but one moment in time is all it takes, as you discovered. Thanks for sharing. Maybe I'll buy the expensive eye protection if my neighbors kids show up with lasers.
Also the crystals used in 532nm lasers lose their properties at low temperatures.
0°C is enough to make the laser appear as if it's not working any more, but it actually still works and emits only IR.
This is very dangerous because people will sometimes try to confirm that the laser is not working by looking directly into it.
More people should know about this, would be nice if you made a video about this effect.
+Francois Deshue how are you typing?
The scariest part is buying something dangerous, and receiving something that's even more dangerous and mislabeled. IT's like buying a poisonous pie but it's actually a landmine. rip.
ok mr krabs
These pies arent homemade. They were made in a factory.
A bomb factory.
They're B O M B S
This cave is not a natural formation
well said
Alucard Pawpad 🤣🤣genius example with the landmine. gg
8:46 When your laser pointer is so powerful it needs a fan.
This is dangerous not funny
@@lightbulb8888 Lighten up maybe?
@@astrick1768 AHAHAH
Guys, I'll take the opportunity and make a request. As a professional pilot, i'm willing to talk about the danger of trying to point lasers to airplanes. People have the tendency to think that "they are soo far, there is no problem". But the issue is that, during the take off and landing, if a laser hits the pilot eye, even for just a brief moment, he can lose his sense of depth. In the cockpit, we follow the rule of "dark and quiet". It's the same thing when someone uses the camera flash when you are in a dark room. Please, can you add some note about it someday?
Thank you guys Very Much
Sorry about my english, i'm still having problems to express what i'm thinking.
another problem is with focal length. Lasers usually aren't perfectly 100% uniform, it's just their focal length is so far that it usually looks uniform to people relatively close to it's emission. This means that, say, over a few hundred or thousand meters, what looks like a thin beam to you can actually be a wide cone of laser radiation that can also cause severe glare on the plane windshield in addition to the normal laser damage
This was the very first thing my brother warned me about. I had a cheap red laser and was playing with it and he said don't ever point it at a plane. I didn't know the reason why, but I knew to not do it.
old gregg "most aircraft simply think they're being targeted by missiles" What? That's just ridiculous. Pilots are not afraid of missiles because 99.9999% will never encounter them.
"I find it hard to believe that a common low power red laser pointer (almost the only kind you'll see the idiots that point it at planes own), can actually cause you to lose your depth perception." Ah yes, the argument from personal incredulity. I've known many pilots who have experienced encounters with lasers at night, and I trust their experienced testimony over your armchair speculation. Did you even read the comments above? It seems to me that a pilot flying at night is an entirely different situation from "a child walking through school."
old gregg I'm not really sure what you're on about. If this is some kind of exercise in absurdist humor for your own gratification, then be my guest and continue to make the meta-modernists proud.
No, small aircraft aren't generally equipped with warning systems for targeting lasers. Such a system would also be quite useless for visible lasers because the pilot would know immediately that they were being pointed at with one.
"a high powered laser would probably make a cessna crash if you pointed it at them long enough" The duration should not affect probability of a crash, as the pilot would immediately avert their eyes as soon as they realized they were being flashed. The temporary blindness would then prevent them from flying properly, as they could no longer see the instruments or the outside. This should wear off in at most a few minutes as long as their eyes weren't permanently damaged, but in the meantime the pilots might make some critical error due to an inability to properly fly the aircraft.
@@OlGregge hi man. Look, i will post a link to a video that The Wall Street Journal did. About the laser danger. And while a simple red laser isn't that dangerous, people use most the green ones.
czcams.com/video/aoIbrav0b6Q/video.html
Another important note regarding cheap unfiltered green lasers: Sometimes you may drop one and suddenly it no longer outputs green light. However, you notice that it produces a faint red glow when you push the button. As tempted as you may be, DO NOT look into the laser to see the red light more closely, as this could mean the crystals that produce the green light have been knocked out of alignment and it is now outputting pure IR.
Oh, i did exactly that
My cheap green laser did this to me when i dropped it. speck of white powder came out the lens and noticed it still melted electrical tape without the visible beam. As much as I love stealthy, invisible things, this was clearly way too dangerous to keep. Disassembled and recycled. Please people do not try to save a buck, go with a different color or go with a higher grade!
I ended up doing this as a kid. Now several years later I've known why.. and I kick myself every time I see talk of it.
wow! do you have any noticeable eye damage? that horrible
Chris Perry Just hit it with a sledgehammer
The beam may be invisible, but thanks for showing us the light!
Aaron Greenfield I see what you did there
Aaron Greenfield well played
Aaron Greenfield *clap clap* well done sir well done
I did not realise the seriousness of these green laser pens(as none of them that people have will be correctly filtered due to cost of a legitimate one) , next time I see people playing with them by pointing them at cars (like mine) , screw the delivery I am on, the police are going to be there before I leave to make sure they are arrested (guess this is why aeroplane pilot get blinded by them and get permanent eye damage, its not the green light that's the issue it's the light you can't see)
@@seanclements6206 Or did you?
Jesus, a 2500mW green laser. Just looking at that thing scares me.
It is not a 2.5 watt green laser. The diode is 2.5 watt, but by time it exits as a filtered 532NM green laser, it is below .5 watt peak output.
Stare at it long enough, and it wont LOOK scary at all
Just take care that the laser doesn't look back at you.
You’ve obviously hav never heard of styropyro, he made a 5000 mW blue lazer
I dont remember what color it was but styropyro built A 100 WATT HANDHELD LASER
JESUS
20000x more powerful than safety limit of 5 milliwatts
Thanks for opening my eyes to how dangerous cheap lasers are. Good job 👍
Doing science the proper way, sweet, thanks Brainiac
Hey, noscope, isn't it funny the retards claim that gender is a social construct and shouldn't dictate how they behave, THEN THEY GO ON TO INVENT 32230402 GENDERS THAT DICTATE HOW YOU SHOULD BEHAVE
"Doing science the proper way". Yeah my ass
Been screaming about this ever since they hit the Chinese market back in 2004. So many kids have messed up their sight or someone else's because no one understands the dangers of unregulated DPSS lasers, especially with no IR filter.
Thank you for such an enlightening video!
For those who wish to dispute MPE (Maximum Permissable Exposure) vs power and wavelength, simply check the graphs here and then start arguing.
en.wikipedia.org/wiki/Laser_safety
thankfully this fad fell off rather quickly. it's been years since i saw a laser
Damn i think i mightve messed my eyesight from these things, where i went on holidays as a kid sold these green lasers and i had one for like 2 years was powerful as fuck and im sure the beam entered my eye a few times. I figured since they were sold on the street they were safe
Rob Spagrenetti damn
Yo Day its not that bad or anything i can still see pretty well its just now that i think about it before i got that lazer i had almost perfect vision and then after i would have to squint to see the writing on the blackboard in school
oh ,Fair enough then . I hope that you got yourself checked from the doctor.
Around 4:10 you can see the card lighting up even though the laser pointer isn't pointing to it. This presents another serious risk of IR lasers, not only can you not see the beam, it's very hard to keep track of reflections.
Once a beam reflects it usually disperses (especially on rough surfaces), which immediately reduces it's intensity. A way of looking at it is that it goes from a narrow beam to more of a wide flash of light, but it's still monochromatic (a single color or wavelength). But... if your starting beam is VERY strong, like something approaching a watt, you must be careful. Even a weakened reflection from that kind of laser can still do damage.
Naruto saves goku in big time regular...
There are also the side-lobes caused by diffraction.
I really appreciate your in-depth explanation, easy to duplicate experiments, and high quality video. This video was refreshing to watch among the thousands of other videos that I have to search through to get to something like this. New subscriber!
It doesn't matter how nerdy the subject is, you're never boring.
That's right. Nerdy ≠ boring.
Wow.. I never knew that.. Thank you for bringing this to my attention.. I still think lasers should come with a label stating
"WARNING.. DO NOT LOOK INTO LASER WITH REMAINING EYE"..
Nah, if you're that stupid that you look straight into a laser you probably deserve what's coming for you.
The bigger issue is that you could still get blasted by IR even if it's not been directly pointed at you (house windows with reflective heat coating) as you don't know you have to assume all green lasers are unsafe unless tested (as markings on them are meaningless) and if they are cheap
Yea, but children aren't even supposed to have lasers, simple as that. No parent should allow a child to even own something remotely close to a laser, it's literally asking for trouble if that's the case.
Avana Stupid people deserve to go blind? I don't know about you, but I'd rather society have to deal with a stupid person who can see and maybe work a menial job than a stupid person who can't see and requires lifelong financial assistance from the government.
Darwinism, natural selection.
Stupid people do stupid things and get what's coming to them. If that causes their death or permanent incapacitation, that just means less stupid people.
Having said that, though, I don't agree that naive children should be penalised for being just that - naive. They don't know the risks of playing with such an item so the responsibility shouldn't be theirs. Parents shouldn't allow children to use lasers, simple as that. Just the same reason you wouldn't trust a baby to hold a live firearm.
Wow I bought a couple of cheap green lasers online and this has scared the crap outta me I'm not using those lasers ever again, you might have just saved my eyesight thank you very much I'm safely discarding the lasers away immediately.
dude its ok to use just don't point at your or anyone eye.
Just buy an IR filter and attach it to the front of the laser. Problem solved.
alex, dont listen to these guys ^ . you had the right idea throwing them away.
The only added danger is that the laser glasses designed to block these lasers wouldn't block the infrared. So if you intended to use them without an expensive pair of safety glasses, there's literally no difference in danger.
You can throw them away to my address if you like? Lol
IR cut filter is actually dichroic mirror, it does not block but reflect infrared back
Oh well, thanks for that information! That would make this even more dangerous, as you might not really expect that (if not mentioned by the seller or where ever). :-/
@@Reaper035 Hey, this is one of the most important threads, it's so underrated. I swear this would have found me too. Imagine shining the laser at it while standing behind expecting IR to be blocked. Woah!
Holy crap my 14 year old brother just got a green laser sold to him at a festival and has been haphazardly shining it in my face to annoy me. I‘m totally showing him this.
Be honest, is the possibility of hurting you really going to dissuade him?
You need to beat his arse and destroy his laser.
That's not good sea turtle
@tinylilmatt I agree with ya man. All these people hurumph hurumphing over the danger of a green laser when a crazy person can buy a hand gun, don't see anybody hurumphing over something that can put a hole through someone's head. But ya kids shouldn't be able to have lasers. I remember shining a red laser pointer into my eye a couple times as a dumbshit kid like 18 or 19 years ago, luckily I didn't do any damage (if I did I'm sure my eye doctor would have told me whilst looking at my retina during one of my many eye exams since I wear contacts.
@@EddyA1337 A "crazy person" literally cannot buy a handgun
As a laser hobbyist thank you for doing this video. I have two pairs of professional grade laser safety glasses that cover most wavelengths that cost me about $125US each after a group buy discount. Expensive yes, but last I knew I couldn't order a new eye from Amazon even with Prime. A word of warning unless they've changed the glasses Wicked Lasers included with their 445nm (and likely others) were a joke and offered next to no protection. One of my "5mw" green pens is like the first two you tested and metered 50mw on my LPM but when I filtered out the 532nm I found that ~35mw of it was IR which didn't surprise me one bit. Also not surprised your units from Laserglow are properly filtered. They're a quality company with quality products and the prices reflect that. This video reminds me I need to get my argon-ions out and give them a workout soon but it's been miserably hot here lately.
LtKernelPanic hey I've been looking everywhere for advice on my laser, it's a 405 1000mh I think and I reversed the polarity on it first day because I'm an amateur, what would I need to repair it? Or do you think I should just buy a new one?
Thank you for spreading awareness of this!
Recently I'm clicking videos of specific things that interest me and it just so happens to almost always be this channel! Subscribed and thank you for good content. Your approach is refreshing and original.
Warning: Do not look directly into laser beam with remaining eye.
Seriously, these readily available unchecked green laser pointers are nothing but trouble. Especially seeing as how they usually end up in the hands of people who should not be handling them at all. (I don't mean you, obviously.)
These really cheap green laser pointer usually ends up in a child hand they can make everyone blind
Yup. I use lasers of the IR variety for my day job, and we treat them as weapons, same as anything else. It's frightening how many times I've seen morons play with them like lightsabers until they were literally tackled.
I tell people that aren't generally around them that if they wouldn't point a machine gun being shot at their friends, they probably shouldn't point the laser that will melt their eyes at them, either.
But they are so fun to point at planes flying overhead. I'm joking but I have actually seen lasers hitting the belly of an airline plane coming in for a landing before a fireworks show near an airport.
I wore my laser safety glasses before watching the video, thanks for the heads up!
Does the laser beam hurt your eyes through the computer screen?
@@lifeseries7944 no
@@lifeseries7944 the laser can't go through a screen, same as how radiation can't go through a screen, the laser just looks like a green beam
What a great high quality content (once again)! I'd never think of that. Thank you so much!
I appreciate the focus on safety. There's another science channel I've watched that actively tells its audience to do stupid things, so I think this is a great change from that garbage.
Which one
So, which channel tell the people to do garbage
Yknow telling people the name of that channel could prevent alot of harm
Can we get the cannels name?
The channel in question name is Fnoigy user/spiderplant
Sometimes you’ll see brake discs glowing purple in video footage, such as pit stops, it’s the camera picking up the near infrared.
Sometimes you see brake discs glowing yellow with your bare eyes.
Sebas Eu that's why you use IR diodes when using those cameras. For humans it's dark but for camera it's brighter than day
isn't heat IR?
EXcentriX it’s complicated. It can be.
@@Sypaka IR is a way of transmitting heat. Heat has conduction. Convection and radiation, IR would be the heat radiating from the source.
The apocalypse happens:
Person 1: "Good you've got flashlights! We'll need those."
Brainiac: "Actually.... They just laser pointers..."
good for blinding your enemies
Great video as always, it goes to show that with a little bit of equipment you can discover something quite shocking. Also great to hear you have set up a Patreon you have lots of veiwers who would love to support you!!
Wow - i did not know green cheap lasers leek IR, now I do. Thanks Brian !
By the way - what about doing a video about laser safety glasses - a top 5 endorsed by Brainiac75 ?
Yeah, that's the problem. How are people supposed to know that a cheap green laser pointer with the 'right' eye-safe rated sticker on it can be a serious eye-hazard? This is my attempt at informing as many people as possible about it.
I don't own enough safety glasses to make that review/endorsement. But if they are from a reputable brand, feels overly expensive and has the OD printed on the glasses it's probably a good set of glasses ;) Thanks for watching!
I also did not know about the leakage of IR.
A good video on safety would be a very good idea. Who know about the quality coming from some of the Ebay sellers.
Thank You for this video and keep the cool and important things comming.
Thank You
@brainiac75 I would guess a good welding helmet would be able to do the same? since they are made to 100% block IR and UV light... and if a speed glass helmet is used it will also dampen the brightness factor... but generally they should block all UV and IR light with or without a battery in them...
@4rgondo I have no experience with welding helmets so I can't vouch for them. I know there are different types. Some are not suitable for watching a solar eclipse, while others are. But if you know exactly what wavelengths your welding helmet is blocking 100% it may be an alternative for laser safety glasses. Definitely better than sunglasses, which are absolutely useless ;)
My hood is solar safe but do to it also being an auto hood laser use would not be as safe. You would have to get a glass filter that is not the auto type and then find out if it's is 100% UV blocking. What you posted in the video would explain why pilots get a bad eye injury from being flashed by some fool on the ground.
I am glad you expressed fear, respect yet demonstrated caution, when it comes to usng powerful invisible laser beams. I like you, don't think many understand the seriousness of the dangers... when in use... I went through an experience of my retinas, almost becoming badly burned, in my teens...
Love the effort you put into these videos man
Great work! I love that u added KSP background music
Hmm, I have a couple of cheap green laser pointers that I got as freebies from a company. They are ridiculously bright and I am already a bit reluctant on using them. Better not use those things anymore I guess.
Just destroy the damn thing and don't even think about using it as a laser pointer for presentations. The power label is most likely wrong.
Use a hammer
One thing I love about your channel is you explain things simply and clearly and at a nice even pace. Looking forward to more of your stuff.
This is a fantastically important subject and video. You do a perfect job explaining the tech and how to test and stay safe. Thank you. Guaranteed you have saved someone's vision.
I'm really loving your videos!
Thank you :D
You've done more for my science safety than 16 years of school!
The Schwag true
Damn right.
Yep.
I've had a green argon laser shot in to my left eye twice in the last two months, but it wasn't an accident: I had a torn retina that needed repairs to prevent retinal detachment. It wouldn't be surprised if there was a lot of IR coming out of that one, since the surgeon described what she did as "spot-welding"!
Oh wow, how did it go?
OK, I suppose. The first time they did quite a lot (~ 600 pulses, they said), and my eye looked horrible for weeks - all red. The second time was much shorter, patching up some areas they missed the first time round. That was two weeks ago: it's going to take some time for the "floaters" to clear.
PS edit: as for why it happened, it's a known risk in people like me who are very myopic (short-sighted) - so I need to watch my other eye for problems too.
+Brian T Good to hear that! It's better to fix the problem before it's late.
lol "floaters" never go away dude. There is a surgery for that but its somewhat risky. Ive had floaters for at least 15 years, and they are never getting better.
+Andrew I’ve had some floaters for years too, but because of what happened they’re much worse than normal. I have been told that most will go away. I don’t want a vitrectomy if that’s what you mean: everything I’ve heard about that sucks horribly for weeks, and then you’re pretty much guaranteed to get a cataract in a few years. Nope.
Even if I couldn't see your videos, Mr. Brainiac, I'd still listen to them! :D
This was highly informative. I appreciate the information on the various lasers, the filters, and the detectors. Thanks!
Any chance of a comprehensible little tutorial on the different types of lasers and common parts they (should) have? You mentioned a lot of terms and types of lasers, including some common parts you expected them to have like IR filters. Please thank you
I'm not planning to, but we never know what the future might bring :) Besides infrared lasers, the infrared part is only a problem in DPSS-lasers as mentioned. Typically 473, 532, 589 and 593.5 nm laser pointers. The DPSS-lasers other than 532 nm are however much harder to make and are most likely equipped with an IR-filter, since they cannot be build for cheap anyway. But I would test them for IR-leakage too if I was rich enough to own one... Thanks for watching!
Great video, as always. I love your sense of humour even when you are talking about serious security issues.
Thank you for the information, it is very appreciated.
I had no idea. THANK YOU for the education!
Your videos are always great.
I enjoyed this video immensely. Please keep making them
I’m glad I came across this video. I recently found a green laser pointer laying around in the grass at a park and just brought it home. It looks identical to the first couple green lasers you used, except this one says the maximum output power is < 20000mW.
This video is a lifesaver
Finder's keepers, don't lose your peepers!
😁😁😁
Oh my god! Thank you for this video. I was just messing around with a cheap green laser pointer without any awareness of damaging my eyes. But now I know what it might lead to. Thank you so much!
in mexico you ca buy these at some street corners from street vendors tha show how powerfull they are by shining them up but some times to the cars. I got hit in one eye and got burned, fortunately it went away by it self, but since then I get really nervous when I see these vendors and try to look away. I also get nervous when I go to a meeting and the presenter is using one of these lasers, I really miss the long pointer sticks.
Dork
+Anthony Z get a life dork.
If you were hit by a stick pointer it would be worse.
Ayeeee here's one Heckler!! Fkn Dork #2
hen your balls drop come back and join us adults online.. k pumpkin? bubuy now
great video as always brainiac
I love this video! You are so good at explaining this to newbies
I don't know how I found this video. but I found it fascinating and I will be sure to check out more of your videos when I get a chance.
Interesting video. I own a laser pointer that looks exactly like the smaller cheap ones, so that's a nice heads up for those things.
[Cheap] green lasers aren't so good with focus due to the frequency multiplier crystal heating and deforming in shape. The beam pattern changes upon starting it up. I took mine apart and refocused it for higher power but burnt my finger with the 1064 nm laser while doing so!
Jim Griffiths shifts in modes are the essence of dpss on warmup even on higher end lab units. That's odd you burnt yourself with "1064" the deeper IRS tend to go deep unlike the opposite end of the spectrum in the high visible 532 or even lower 450, and 405nm.
Nice video, crystal clear content, pacing is terrific!
I like and appreciate all your content thank you for producing this for us all. Cheers
Nice description of the danger associated to a cheap DPSS laser. First time I see a clear video on that subject: many thanks...
I thing it could be worth to add something about IR light dispersion too: green light is usually well focused (even on a small DPSS), but the refraction index of the lens is very different considering IR (@808 & 1064 nm). So, targeting slightly off the direct line of sight of the beam to some animal or somebody could even remain dangerous at short range...
I did some measurements using a Coherent power meter (using IR filter) and found that sometime a cheap laser could provide 2 to 5x more IR than green light power!
I love your videos & your voice. Thanks for your work!
This is a very informative and clear video, i loved it!
Most excellent set up and explanation. Thank you for your scientific approach and talking slow enough that your accent wasn't an issue in understanding.
Excellent video!! Thanks!
A very good scientific experiment, I learn a lot, thanks~
Thank you for the information. I have several Green Lasers and had assumed the wavelength was pure as you said a lot of people do. I was unaware of this phase shifting technique in use with green lasers. I will be discontinuing using my green ones unless I can afford a higher end.
Very cool, had no idea the risk they carried. Thank you for educating me. :)
Great work!!
Ya but can someone translate this to english what is an IR filter
In most cases the fast divergence and minimal residual NIR, the density is low and would take a direct hit and or specular reflection to inflict damage. I did several measurements years back and typically saw less than 5mW of 808/1064nm combined. In units utilizing a class 4 pump diode they usually ship with a filter. Though be careful none the less...
Thanks for the info! That may explain why, despite taking precautions, I noticed some "eyestrain" after using a green laser through a glass window. Although the visible light always went through another pane from the one I looked through, who knows how the IR light might have reflected...
Excellent, excellent video. Practical education at its finest.
Super interesting video as always! Since school is starting up soon, I’ll have to recommend your channel to my science teacher! These videos are much more interesting than the text books!
They're so pointy I love it
craig mk3
Don’t be so highly technical!
That was very informative and helpful. Thank you.
What a great, professional video. Thanks.
Danish Man is Miffed Over Cheap Lasers
(That summary[?] over, this was a very informative video - I may never cross the path of a green laser, but at least I'll be prepared for if I do.)
Thanks Brainiac for another superb video! Noticed in the comments that some people didn't understand what is the danger of the leaked IR, so can be interesting if you can do a follow-up video or a top comment of your own video explaining the severe risks. Thanks again!
wow, i had no idea! i had a cheapo green a while back, had no idea, glad i never hit my eye, what a wonderful, educational video you put out thank you!
Thank you ever so much for this test.
>5mW laser pointers are treated like guns and other weapons in Australia since 2011. We had a spate of idiots shining cheap green lasers at aircraft and dazzling pilots.
Same in (kinda) all Scandinavian countries, but there's not a huge crackdown on the lasers, cinse I can get them easily through customs
Australia is a shitshow so this isn't much of a surprise.
It's very distracting i have copped 2 at the same time while driving. From a long distance the laser dot is the size of a dinner plate on the car. I'm not surprised they are banned from being imported.
@@jaqq333
Portugal is a shithole compared to Australia. So many Porkandcheese people coming back here after moving back there because of the sinking economy. I can insult Portugal because I am of Portuguese heritage. Foda se
What a cool video! I am glad to know about infrared contamination in such lasers.. the infrared lasers came with keys? haha, they must be very high power
Very informative thank you, something to look out for in the future.
Thanks very much for this detailed demonstration and explanation
I've never actually seen an inverse-Stokes fluorescence upconversion phosphor! I've only ever seen the normal visible light charged ones that are pushed out of their metastable state by the IR. Apparently the very first visible leds weren't red gallium arsenide phosphide but just the original infrared GaAs diodes with a dab of this green upconversion phosphor on it! Barely visible though for obvious reasons of abysmal efficiency. I would love to see a video explaining the difference in types of "light upconversion" from metastable phosphor excitation, to second harmonic frequency generation, to true phosphor upconversion (whose actual physical mechanism I can't remember right now!). I don't think anyone else has done a video on that yet.
Yes, it is quite nice. Fluorescence is not limited to the usual UV-->VIS conversion. I don't know enough about it (yet) to make a video, but I'm interested in it and may look further into it. All I know right now is, that the phosphor on the green card is an 'yttrium-ytterbium-erbium compound'. Thanks for watching!
Really? You mean all three of the elements that came out of the Ytterby mine? What a coincidence!
Eric Lloyd All three? I'm pretty sure (but not absolutely certain) that the first half dozen or so lanthanides came from that mine
Sam Musson I misspoke - I meant the three that were *named* for the Ytterby mine. I stand corrected.
Big words
I did damage to my right eye with a laser pointer when i was 9 years old, im 24 now and i still have a black spot in the lower right of my FOV
How?
@Tt Miller Unless we get tech to heal eyes! And we're getting much closer
This is a great informational demo video. Worth taking note.
This is a great video explaining the risks of cheap lasers and infra-red. Thank you! :)
Thank you for this video. I'm sure you saved someone's sight.
Nice choice of glasses, good investment. Invisible light will damage your eyes is no joke. For everyone looking at glasses don’t cheap out and spend the extra money, you get what you pay for. Good thing you had them on because that clear IR filter glass has an anti-reflective coating on it (blue tint was a give away) and I’m almost sure the IR was reflecting back at you. Not sure if they should be called filters, since technically filters defuse the substance not just block and reflect it. Still it severed your purpose and you had good glasses. I never trust Ebay or Amazon Descriptions when it comes to your eyes and glasses, I tested a few fake glasses over the years sold online, a lot of them with fake certifications.
I use these same IR blocking anti-reflective lenses in LED flashlights to increase the light intensity.
Gadget Review Videos - wait, how does an IR filter increase the intensity of a LED flashlight? I was totally with you up to that part.
good stuff mate well composited
Very methodical. Nicely done.
So interesting!
AHHH MY EYES! THE SAFETY GOOGLES DO NOTHING!
I'm glad I get this reference.
-Safety Googles-
Regular sun glasses**
I enjoyed your channel and descriptive language you used :) subbed, very nice braniac
Fantastic accurate testing!
Wow that was awesome and I am actually scared for your safety now please be careful , and keep making this amazing videos dud , this is going to be fun topic to discuss with my friends , thank you for your hard work , as always sorry for grammatical errors , and greetings from Iran 🌷💓
Ah, you know me Abteen. I always minimize the risks to make it somewhat safe. Though, not handling this stuff would be safest :) Greetings back from Denmark.
Brainiac75 And those laser glasses are really expensive!
Greetings to both of you from a Zoarastrian from India 🙏🏽
*@Charged Supercap* Yep, I thought twice before purchasing them... But when handling infrared lasers I have no choice but to buy proper safety glasses. Thanks for watching!
Patreon? IM IN!
This was very entertaining, I love laser's. Also not to sound weird, but I like the way you talk...
Thanks for the information. Good video!!!😎
8:37 Idk why, but I love how he said that.
I clicked like... now go smile.
Interesting video though. I learnt something new today.
I clicked Subscribe too :)
Really cool and interesting. I had no clue about this.