Some interesting effects observed in 5 watt 445 nm blue laser pointer.

5 watt Endurance laser pointer.
Exploring 445 nm multimode NUBM44/47 (LD) NICHIA laser beam.
Some interesting effects.
Longitudinal laser beam interference
Observe a central mode
The laser beam can disappear completely, and then reappear after a few meters
The interference pattern in the air is very unstable and constantly «breathing», but it is still clearly visible.

Interestingly, when the laser beam passes through the smoke of a fire, it is clearly seen that the laser beam interacts with the smoke only in a certain place, and then continues on its way, and the brightness does not visually change much.
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