Status report of Polarization RSE

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Presentation transcript:

Status report of Polarization RSE Peter Beyersdorf National Astronomical Observatory of Japan AIC working group G030113-00-Z

Outline Review of polarization RSE. Technologies being tested. Current status.

Polarization RSE Polarization RSE is an RSE interferometer design that uses the control scheme of non-RSE interferometers. Polarizing optics allow the signal and power cavities to use the same recycling mirror. Polarization sensitive optics in the recycling cavity set the finesse and detuning of the power and signal cavities independently.

Polarization RSE l/2 VWP PBS (1) (3) (4) I dL+ Q (2) dL- 3wrf dl+ dl-

Relevant technologies Use of an orthogonally polarized local oscillator Controlling a Michelson without asymmetry Phase shifting the resonance condition for orthogonal polarization states in a cavity Creating polarization sensitive finesse for a linear cavity. Generating the appropriate input light spectrum Managing seismic “roll noise” from birefringent optics

Use of an orthogonally polarized local oscillator 2EsigElo cos(fsig-flo) Esig-Elo Esig+Elo Polarizing beam splitter

Control of a Michelson without asymmetry VWP PBS (1) (3) (4) I dL+ Q (2) dL- 3wrf dl+ dl-

Differential tuning of a birefringent cavity As the birefringence of this waveplate is varied, the transmission spectra for the two polarization states become detuned VWP l/2 PBS power polarization signal polarization Transmission spectrum of recycling cavity showing both polarization states

Creating polarization sensitive finesse for a linear cavity. A non-normal incident window provides different coupling for the s and p polairzation into the recycling cavity

Elimination of 3rd order sidebands fx3 + G transmission line resonance

Current Status Interferometer is fully built All 4 degrees of freedom have been locked Robust locking has not yet been achieved – there are still noise and stability issues with the electronics l- and l+ control scheme has been validated L- and L+ control scheme has not yet been validated (currently using arm pickoffs rather than bright port signals for arm control)