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20mW DPSS produces around 1W of heat. if it's older unit based not on KTP then cooling them down indeed increases efficiency of frequency doubling

Also most commercially available system have lock-in builtin and work on simple IR led. much simpler, more robust and harder to spoof

This things are most often implemented with blinking light source and lock-in detection on photo sensitive element. Otherwise just flashlight can spoof your "security". That being said if you want it to be slightly more secure I'd suggest buying 808nm low power laser diode. This will be almost...

for high power blue search NUBM on known chinese sellers or ebay

First picture is diffraction grating in littrow configuration in my dye laser setup. Because it's blazed diffraction grating enough light gets reflected back to resonator support lasing even at the edges of gain of dye. To get sharper tuning and narrower line sometimes light is sent twice...

look into external cavity or tunable laser diodes. Basically you put diffraction grating in littrow configuration to reflect light back into grating.

To be fair 50W 808nm laser diode array pop on ebay ~100$ so it's worth looking into instead of flashlight. Sure it's a bit more expensive but 10khz rep rate instead of few hz is just so much better on eyes

Can we pin it for all people that want to buy high power lasers without goggles and training?

So the problem really comes from diode pumped lasers. If you have single mode laser you can focus it and way you want and you want cavity mode (that is where the light is in laser resonator) to overlap as well as possible with pump mode (where pumping laser hits the crystal). With your...

Ok then longer rod than tube makes no sense and just complicates alignment. (except if you want Q switching then longer rod may help a bit with thermal lensing).

If I can ask where are you located?

ok 60$. I'll send you message with all shipping details and please send me payment data.

Com'on don't disassembly it for parts in head. If you sell it on ebay you'll probably be able to afford more parts. It's probably very scaled OPSL or DPSS, either way there will be thermally stabilized LBO crystal, well cooled laser medium and pump diodes. I don't think you can use IR pump...

Poland. Yes, I expect them to be in series from error message but you never know for sure with this things.

or if your pump has big mode it can improve power. How are you planning to pump it?

Yes, I'm aware, I'll either use them as frequency selective elements in resonator or as reflective filters with mounts painted black. Do you have more precise specs of the dichroics? Also after further consideration I'd change it to 2 dichroics, 6 FS mirrors and 12 mounts. Would you be fine...

And if you insist on switching DPSS laser I suggest either thermally stabilizing crystal or externally gating laser

how much for 808nm fiber coupled? And what fiber is it?

I'd take 4pcs FS mirrors, 4 pcs of dichroics and 12 mounts 55$ + shipping?

in case you'd be throwing it out I'm ready to buy it! On more serious note if you disassembly unit you should be able to find connector that's in series with a switch, that should be interlock.