In learning more about this topic I came across a laser safety glasses video on YouTube: https://www.youtube.com/watch?v=WnDjIDhxnMs
The message is a little long - don’t buy eBay uncertified rubbish - but there’s a salient point that I had not heard before.
There is the potential for other wavelengths to be created by cheap lasers. In the video, there’s discussion around infrared laser light also being generated in addition to the light that’s specified by the laser, in our case 450nm (for a SM2), 405nm (for SM Original) and 445nm (for the SM Original High Power module).
The video makes the case that you need to take this into consideration for some lasers.
Is there anyone who has measured the actual output of the SM2 laser?
The Wavelength for Infrared is 800nm to 1mm, which is a wide range.
Anyone?