Sorry, I missed the #39 post. Just purely amazing that the 500mW diode could be pushed to 5 times the rated output. However, not very practical :-)
I don't understand what you mean by bubbles leading to lumia effects. Are you referring to my idea with the submersed fiber coupled diode? Exactly where would the lumia effect be introduced? Maybe I was not clear, but I meant submersing a sealed fiber coupled diode and just have wires and fiber exiting the tank. No direct light through the liquid.
I can't wait to see your setup with 2 beams and the PBS. Wonder what will vapor most LN2? The heat from outside or the energy from the diodes...
Btw. leave the red already and get going with the 445's :-D
Best regards
Jan Thogersen