Laser Pointer Forums - Discuss Laser Pointers | High Power Lasers

Hi everyone, I have a laser diode from a DVD player but I don't know how to connect it. The diode has four pins and I'd like to know the function of each of this pins. I've attached an image, as you can see there are three pins with black base and the other whit yellow base, maybe it would help.

Thanks for your help

CU

PD: Congratulations for this forum and sorry for my English.