In the recent SRY length measurements, the intensity noise of the main laser observed with the OMC REFL PD has been limiting the improvement of the SNR.

I came up with an idea to lock the OMC to the main laser during the measurement.
With this configuration, the main laser, which is the source of the intensity noise, will be transmitted through the OMC, while the auxiliary laser, whose frequency is shifted from the main laser, will be reflected by the OMC. Therefore, this method may improve the SNR.

I would like to discuss this method at tomorrow morning' meeting.