Its about size of emitting point as well, Laser diodes have a very very small emitting point. Without taking other considerations (coherent etc) this is also the reason spot will be smaller when focused than with other light sources. You can't get so small emitter with that huge amount of...
Yes, ok, but these bluray diodes are multimode. Even if you get stable WL this is not a narrow band so I don't expect any coherent emission with SHG. Maybe 1-2mW of UV if lucky for a 1,5W 405nm? So if you need cooling control for just couple mW UV (or maybe nothing) I can't see the benefits for...
Why not 450nm for SHG? But I can't imagine how you could get SHG phase matching from a M2>5 MM blue TO Can diode. Moreover peak WL is going to change depending of current and temp, but also, from one diode to another.
It seems this divergence is measured after Gball lens. Otherwise have no sense for me.
It could be great to know divergence before Gball to compare with G84.
I purchased one G84 (dual beam) direct from mitsu to test, and divergence from each beam is worse than even NUBM44.
So maybe for pointer...
Yep, right. However dummy load is not exactly the same load than a Laser diode. So this is not 100% accurate, but yes, maybe the better approach. There are some drivers with current balance resistor on the output. On this drivers, Another way is to measure voltage falling across this resistor...