Automatic alignment of a rigid spacer cavity

Details Automatic alignment of a rigid spacer cavity Automatic alignment of a rigid spacer cavity

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gregr..37.1591r&link_type=abstract

General Relativity and Gravitation, Volume 37, Issue 9, pp.1591-1599

Physics

1

Gravitational Waves, Instrumentation, Interferometers

Scientific paper

A bench-top auto-alignment system employing an invariant Gouy phase telescope is described in this paper. Our system uses external galvanometer-actuated mirrors for the tilt and offset control of a laser beam onto a rigid spacer cavity. Wavefront sensing diagnostics which accurately decouple tilt and offset er-rors are employed, and corresponding orthogonal corrections are enabled with the aid of electronic nulling. The closed loop system achieves an alignment fluctua-tion suppression of 50.4 dB for angular tilt and 58.3 dB for lateral offset at 1 Hz, with a unity gain bandwidth in excess of 115 Hz.

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