David Notebook: Difference between revisions

 

 

The camera was extremely temperamental. The XP computer in the other lab room would recognize it and work, but the laptop would not. I re-installed the software/drivers, which didn't fix it right away, but eventually I got it working. I couldn't say what I did. The upper USB port on the right side of the laptop worked for it though--some of them seem to give better luck than others. With the TA all the way up, the beam is way too strong for the camera to properly image, but I don't want to turn down the power in case it affects the beam size. I put in a 780 notch filter, which always it to be imaged without overloading at the shortest shutter speed and low sensitivity. I don't think the notch filter should affect the shape much, especially since the beam has already been filtered by the fiber and should be almost all at 780 nm. I turned the chopper off since it runs at a similar frequency to some of the shutter speed options and was interfering. The beam looks very Gaussian as expected.