After a few setbacks, I finally have the experiment hardware set up with the SLM in place, although its not attached to my PC yet. Basically, I had to add another beam splitter and 2 new lenses to accommodate another actuator, and for some reason this really magnified intensity distortion in the laser spot. The result was that the classical AO controller wasn't able to handle more than 2 or 3 modes before the sensor started returning bad data. To fix this I changed laser (which meant changing the focusing optics), and after days and days of tinkering, I finally have it working pretty well.
Another note is that almost all of the beam reflected off of the DM must hit the sensor. Anything else and things go to hell for some reason.
Right now the SLM is just there passively as I run through all my control code to test for goodness, but over the next few days I'd like to get it attached to my computer and taking commands from matlab. This requires a PCI card that I have to find, so it could take some time. There's some question about whether this SLM works, but I'm open to using another DM if I have to, although that would take months to order.
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On the edge of incompetence
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