Sadly, I don't have an LPM. At rough guess, I would say this is hitting about 50~60mW. I am driving at 600mA. The pump diode can go higher, I don't know how this will affect the lifespan though. I saw on LPF people pushing these to 1A but I don't know that I will get that high. The green is indistinguishable from 532nm DPSS. If these units work well, I will have my yellows and oranges back!
Another thing to note, the bare OPSL modules have a super thin beam at aperture with high divergence; 4+ mRad. These RGB modules look like they have either a telescope in front of the unit or some kind of grin assembly (see pic). Either way, the divergence is still not great but much better. Without doing any math, to my eye, it looks to be about 2 ~ 2.5 mRad. Very usable but since the assemblies are so small, there is no way to clean that up without affecting the other diode beams
Agreed. It was so touchy. I don't know a lot about OPSLs but I am pretty sure the heater is for the SHG crystal. The sensitivity seems to be limited to the crystal/heater though, not the ambient temp of the laser... e.g. placing my thumb on the top of the unit for a few minutes didn't affect the output. So, modulation might not be too bad although this is probably due to thermal lensing. I didn't think thermal lensing would be that extreme at these "lower" power levels, if that's what is happening.Interesting about the thermal sensitivity... Would not have guessed that!
I ordered 5 of the RGB units. I am going to get the red and blue working on this one and then I am going to get the others going. I am curious if they are all this picky or if I just managed to pick a winner!