I THINK what has happened here, is the diode in wuestion may be lasing at a higher threshold than some others...a typical beam spec like that is created when there is not enough juice running into the diode for the entire emitter to activate...I hope that makes sense ? Since the emitter is amost microscopic, and going through high powered optics at close range - it dramatically magnifies the end result....
I think you're onto something here, see photographs. The line comes from the diode, not the aixisz lens, as it doesn't rotate with the lens.
Just above threshold, 40 mA, you can clearly see the line. At higher power it's still there, but the dot gets so bright it's hard to spot a 120 mA and near invisible beyond. I've also indicating the resulting voltage across the diode at various currents, this goes up to about 2.75 volts at 160 mA.
I have the same "saturn" pattern on my GB diode at low power (on both i've tried so far), I think they're all like that. Anyway, i've been trying to burn matches and i can't get them to ignite. I focused the aixiz module properly and i went up to 180mA current. Maybe I need to point it more carefully so it's on the same spot for a couple of seconds... i don't know. What do you guys think? i'll try to put it into a better housing (flashlight or whatever) so i can aim better.