Dan,
That little thing is a heater. Here is my guess on what is happening.
You fire up the pump diode it warms the silicon plate that it is sitting on, you get a little green. When you cool the assembly down you are changing the pump wavelength slightly and your power goes up. then as it cools more you pass the wavelength match for the pump and dbr crystal then you loose lasing.
I would attach the module to a heat sink so it can get rid of the pump heat. Then apply some power to the heater wires and slowly increase current until you get lasing back. Unless you have a good thermal controller for your tec it will just make things harder. I think that module is rated for about 60 or 70 mw so that is your goal.
The way the pico projector handles this is they turn on the pump diode and set the heater some ware close then they use the photodiode that is mounted on the sled to look at green power and peak it from there. I think.
When I looked at things on the scope they PWM modulate the heater current and you can see it PID hunt for the best light output.
Congrats! As far as I know you are the first to get green out of one of those. I have one sitting here I just have been so busy that I have not had time to muck with it. But thanks you have confirmed the pin out conclusion that I came up with.
*edit, if you look at the pic from "impulse" you can see the resistive element through the crystal. "The "M" looking thing.
chad
Last edited by chad; 11-20-2011 at 11:54.
When the going gets weird, the weird turn pro.