Some questions about your kit:
1. Is the laser diode output circular rather then oblong when viewed defocussed onto a surface?
2. How linear is the power output with reference to the PWM percentage and is it repeatable from one diode to another? Can you show us some linearity curves?
3. At what PWM percentage do the diodes start to lase?
Mike
Hello, sorry for late reply. We are quite busy here
1. Beam shape depands on the focus distance. For short focus distance around 20-30mm the beam spot is around 0,1mm and it is round. Power is a little smaller because the lens are not catching whole light. At longer distance the beam is a stripe but properly set it can be used as a nice squre. We are working on our software and it will allow to engrave pictures with big pixels square sized in high speed. We did testing and made a 100x100 mm^2 picture in like 15 minutes only.
2. We do not have any graphs but the idea is that PWM is switching the dioe to full power. The only condition is that the PWM should be higher frequency, for example 5-10kHz. This way the signal is averaged and power output is very linear. I mena if you use 1% fill you should obtain 1% power. This is happening thanhs to our high speed driver which is able to work with 50-100kHz signal easily. We will be doing testings soon after we end our docking station, then some graphs should show up
3. It will lase instantlly. 1% ~ 1% power. If you speak about analog input then situation is a little different. You need around 0,3-0,4V to start lasing action. It is connected with diode threshold current.
