Can I change resistance values in laser diode driver circuit to be able to use it with another laser diode? Answered
I have Laser survey units,tens of them, each has IR original laser diode with this specification
((Ith= 17mA, Iop= 31mA, 798nm, Im=1.26mA)).
This laser diode is not available any more, I used to use a Sanyo replacement for it DL3144-008S with
The driver of laser diode is attatched, Iused to change the value of series resistor with photo diode to adjust the output power and it works great.
Unfortunately the new LD is also not available now the available one for me is 9GAIA red LD(ADL-65o55TL) with ((Ith=18 to 25 mA,Iop=25 to 35mA,655nm,Im=0.12mA))
the beam is very dim even with current 35mA!!! does it have any relation with monitoring current which is very low in the new one and if it has, if someone can advise me how to change values of the resistance to let the driver work with the new monitoring current, and if it is something else kindly advise