The polarization Sagnac interferometer as a candidate configuration for an advanced detector

Beyersdorf, Peter T.; Byer, R. L.; Fejer, M. M.
June 2000
AIP Conference Proceedings;2000, Vol. 523 Issue 1, p200
Academic Journal
We present a delay-line polarization Sagnac (1) interferometer that utilizes the increased laser power which will likely be available to future advanced detectors (2) to greatly simplify many laser and interferometer control requirement. We describe how the signal sidebands and the local oscillator are made common path by using a polarizing beamsplitter and controlling the circulating light’s polarization state. The common path nature of the interfering beams simplify alignment, reduce the interferometer control effort, and lower the laser amplitude and frequency stability requirements by 6 orders of magnitude over a frontally modulated Michelson interferometer. We present experimental verifications of the robustness of this configuration, which was implemented on a 2m tabletop interferometer © 2000 American Institute of Physics.


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