User:Anthony Salvagno/Notebook/Research/2010/08/24/What the $

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The new laser is pretty sweet. But before I get into the cool observations from today, I have one thing to share:

What the hell is going on here? This is the QPD signal of the beam after it goes through the AOM.


  • We found the beam waist to be 1.26mm at a distance of about 625mm away from the laser aperture.
  • We looked at the bare beam on the QPD and it looks really steady with a signal drift of less than 0.1V (meaning the fluctuations in the beam)
  • Pranav took pictures of the beam profile and got a nice profile.
  • I am going to email Gooch & Housego to see if there is anything they can do to explain why the laser behaves the way it does after the AOM.