David Notebook: Difference between revisions

'''6/9/14'''

We realized just before DAMOP that we were getting feedback to the 780 laser. A lot of it seems to be coming from the cavity mirror, since the frequency/mode of the 780 seed changes when adjusting the cavity piezo. After retuning the isolators, the seed laser appears stable both on the OSA and wavemeter when adjusting the cavity piezo. We noticed there is still some change in signal on the photodiode when adjusting the piezo, and this occurs even with the 1064 off, so it seems there are still small back reflections affecting the 780. This is a much smaller effect than previously though, and since it isn't causing the laser to jump frequencies, we think it shouldn't be a problem.

 

The 633 light was much weaker today than when we were working on it before the conference. It was still visible through the prism, although dimmer, and it was unclear whether it could be seen through the fiber.