Recent content by Lee55555

My son has just suggested an experiment to distinguish the 2 possibilities without dismantling the laser. Since the red goes straight through the glasses but the green is blocked, you put the glasses just in front of the laser and shine it straight through them just in front of a screen. If the...

Well thank you all for your opinions. I guess it is either (or both) fluorescence from the glasses themselves (which I must admit I suspect) or the pump diode having a broad bandwidth emission that has some component in the visible even though the peak is in the infrta-red. Unless someone can...

I just love the idea of the single malt experiment (let's see if it's reproducible, we'd better driink that one and refill it and try again. Well we need to see a result at least three times to believe it is consistent. Better drink that one etc. etc. etc.)! But sereiously, if whatever the beam...

Sure but the goggles are only filtering wavelengths out, not changing wavelengths. If they have an O.D. of 2 for the 532nm wavelength, then only 1% of that light will get through, but it will still be green! They won't change the wavelength of that 1% to red. The filter subtracts something from...

Just wondered if anyone can explain this. if I point a 100mW green DPSS laser at a surface and view the reflected spot with green laser safety glasses (i.e. ones that block the 532nm beam) I see a red spot, fairly bright in a darkened room, certainly comparable with a low power presentation...

Can anyone advise me where to pick up an i-red filter for a handheld green DPSS laser in the UK at a reasonable price? I have a nice 100mW laser which is very bright, but it is unfiltered and that makes me a little jittery about using it indoors (yes I have safety specs but they are not dual...