Laser Diode Pinout. 4 pins??!!

Hi, I got a DVD Player at an auction, in fully working condition, for $10. So, since I already had one, I decided to remove the insides, and extract the laser diode within. I did so, expecting to have just a normal 50-200mw 3-pin red diode. Instead, I have a 4-pin diode, of unknown wavelength, color, and power. Would anyone happen to have a pinout for it? The pins are arranged as below in the picture.

Picture of Laser Diode Pinout. 4 pins??!!
Go to this web site:

Enter DL-3100 in the search.

Download the datasheet.

The pin out will match with the laser lenses. 

Astinsan6 years ago has a pinout. It also includes the driver circuit plans. may be the same