David Notebook: Difference between revisions

 

'''9/2014''' When trying to set up the 1555 amplifier after a couple months of inactivity, everything was not surprisingly pretty misaligned. I was getting only about 2 mW to the amplifier, and so sometimes the power would drop too low to properly seed it when I would adjust the grating. Eventually I re-aligned everything including the isolator and the EOM. For the EOM I just maximized the power through it, and checked with a photodiode and RF analyzer that I was still getting a signal at 20 MHz (the beat frequency between the original and shifted beam). I'm getting closer to 3 mW now at the amplifier, but this is still less than I remember it being when Josh and I were working with it a few months ago. I'm only seeing about 13 mW right after the grating. Could there be a problem with the diode? Is the feedback just very off?

 

==Long-Term Ideas==