Today tried to take our first cavity scan. We unplugged the 55MHz sideband input from the RF combiner on the PSL table, and connected a network analyser instead. Using the network analyzer we injected a 12dBm signal (swept from 32MHz to 45MHz) through the RF combiner into the EOM to create our swept sidebands. We measured the MC cavity response by looking at the signal comming out of the RF photodiode on the MC2 table. I replaced the BNC cable connected to the RF PD with a longer BNC cable that could reach our network analyzer next to the PSL table. Riju will post a diagram of our setup.
We didn't see the expected carrier resonances when we performed a cavity scan. The light incident on the RF PD is around 0.7micro Watts and we are still thinking about whether this is strong enough to see our signal above the noise. We also want to work out what the strength of our swept sidebands is. We will attempt to do a 'real' cavity scan tomorrow.