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Just like marcuspeh said, these crystals change the wavelength of the light passing through them. Most common are frequency doublers, which take 1064 down to 532. I'm pretty sure you can make some of the yellow wavelengths through solid state laser pumping if you have the right crystal. If you...

It was a 700 mW 405 nm laser. I didn't notice any heating of the laser head. The head was put into an LED heatsink big enough to dissipate just about all the heat coming off from the laser head, so it wasn't something I was really worried about.

I had a laser once that would start blinking after a few seconds because the driver would get too hot. I filled most of the module up with thermal paste and that seemed to solve the problem of the driver overheating. I wasn't too worried about damaging that laser, but if you're worried about...

Hi everyone! So I'm thinking about making my own laser engraver to etch wood, leather, etc. I imagine at least a few people on the forum have built one at some point and I was hoping to get ideas and tips before I start. I am planning to use a 3.5 to 5 W diode, and yes I wear my safety glasses.

It's connected to a variable power supply, and a pretty reliable one at that. I started by connecting to the 5 volt fixed outlet with a max current output of 3 Amps. I switched to the variable ports though so I could watch how the current fluctuates when it starts blinking.

I don't know. I bought it off of DTR's Laser Shop. I chose the diode and the current I wanted out and that's it. That one chip producing the heat should just be the voltage regulator, right? So if I stick a small heatsink on that, given that I don't short anything, It'll give me a longer...

It looks to be soldered on firmly. I soldered the wires connecting the power supply to the driver to give it a solid connection. If I were to attach a small heatsink to the driver in addition to the fan, would that at least increase the duty cycle?

I was connecting the power supply to the driver circuit using alligator clips.

I'm using alligator clips

It starts slow, but gets faster as it gets hotter. I put a processor cooling fan behind it and that gave me a longer duty cycle, but it still blinks after a while.

So I bought a BDR-209 16x 405nm laser diode with a 700ma driver attached from DTR's laser shop. I hooked the driver up to a 5 volt power supply, but after about 30 seconds it starts blinking. I imagine it is doing this because of the thermal shutdown that is sometimes on driver circuits. I...