635nm laser diode driver

[light quantum]

some 635nm diodes arrived today (7mW rated). Can I use the driver from 5mW laser modules (AixiZ/Sure) to power them at reasonable current?

 

[hugo999999]

yes you can, you may want to check that they don't output any more then 40ma though (with a load).

 

[light quantum]

thank you for the quick reply! I thought of driving it @ 45mA or so.
The driver seems to be PD feedback regulated, so I can´t check this with a dummy load.

 

[hugo999999]

45ma should be fine for those diodes, i think they have a max of 50 or so

 

[light quantum]

what about pinout? datasheet said like dvd-diodes with case negative, but I powered 2 diodes, first with 30mA then with 50mA according to this, but NOTHING happened. No LED, no Laser, not even a faint red led.

 

[light quantum]

anyone? an idea what i´m doing wrong?
Laser diode is DL 6353TL ;
datasheet:
http://www.laser66.com/html/DL-6353TL.pdf

 

[HIMNL9]

Your ones are TL or TR, as end of the part number ?

As you can see in the datasheet, they have the LD chip reversed, the TL is case positive, where the TR is case negative .....

 

[light quantum]

Seller claims it´s TL, but it obviously is not the "case" - thanx alot, I don´t have much time left today but I will try tomorrow and post the results.

 

[HIMNL9]

Just as suggestion, use one of these that you have already tried, and check with a DMM in diode or low ohm position, between pins 1 and 2 ..... at the right polarity, you must see some dim light, and in diode position, usually the current is not enough for damage the diode (if is not already dead, ofcourse)

 

[light quantum]

Ok, now I got some time to check those with a multimeter.
You are right: They are case positive! Now I got 2 635nm LEDs. Thank you very much.
At least there are still 4 untouched laser diodes...