J. Oberling, S. Doravari
With the HAM6 activity closing out, we took advantage of the window and tweaked another laser and swapped it into SR3. The SN of the new laser is 199. This was installed in the SR3 optical lever so we will have data for a direct comparison between the stabilized diode laser here at LHO and the fiber-coupled HeNe in use as the LLO SR3 optical lever. We will begin monitoring this laser tomorrow after it thermally stabilizes overnight so we can perform, if necessary, final tweaks to the laser power to finally stabilize the laser.
Just attaching images associated with this work.
1) SR3 Oplev laser currently installed is Sl. No. 199
2) The binary switch state for setting gain and whitening. Currently there is just 3dB of gain and no whitening
3) power spectra of adc noise floor and sum signal to show that the signal is atleast ten times larger than the noise floor at all frequencies of interest
It seems there is a discrepancy between the SR3 pitch slider and the SR3 oplev motion. I move the pitch slider by what I think is 0.5 µrad, and the oplev reports that SR3 moves by 0.2 µrad. Not sure about yaw.