Arm locking with Doppler estimation errors

Details Arm locking with Doppler estimation errors Arm locking with Doppler estimation errors

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jphcs.228a2044y&link_type=abstract

Journal of Physics: Conference Series, Volume 228, Issue 1, pp. 012044 (2010).

Physics

1

Scientific paper

At the University of Florida we developed the University of Florida LISA Interferometer Simulator (UFLIS) in order to study LISA interferometry with hardware in the loop at a system level. One of the proposed laser frequency stabilization techniques in LISA is arm locking. Arm locking uses an adequately filtered linear combination of the LISA arm signals as a frequency reference. We will report about experiments in which we demonstrated arm locking using UFLIS. During these experiments we also discovered a problem associated with the Doppler shift of the return beam. The initial arm locking publications assumed that this Doppler shift can perfectly be subtracted inside the phasemeter or adds an insignificant offset to the sensor signal. However, the remaining Doppler knowledge error will cause a constant change in the laser frequency if unaccounted for. Several ways to circumvent this problem have been identified. We performed detailed simulations and started preliminary experiments to verify the performance of the proposed new controller designs.

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