To prototype sample mounting and imaging, I need to have very close access to the Raspberry Pi camera sensor. This involved a bit of custom modifications, as I explain in my latest blog post:

http://kmdouglass.github.io/posts/accessing-the-raspberry-pi-camera-image-sensor.html 

I have also finished the laser diode driver circuit with ON/OFF switching controlled by the Pi; I only need a few cables to test it. Once I do, I will post the final design of the driver circuit.