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A Precision Angle Sensor using an Optical Lever inside a Sagnac Interferometer

By J. M. Hogan, J. Hammer, S. -w. Chiow, S. Dickerson, D. M. S. Johnson, T. Kovachy, A. Sugarbaker and M. A. Kasevich

Abstract

We built an ultra low noise angle sensor by combining a folded optical lever and a Sagnac interferometer. The instrument has a measured noise floor of 1.3 prad / Hz^(1/2) at 2.4 kHz. We achieve this record angle sensitivity using a proof-of-concept apparatus with a conservative N=11 bounces in the optical lever. This technique could be extended to reach sub-picoradian / Hz^(1/2) sensitivities with an optimized design.Comment: 3 pages, 4 figure

Topics: Physics - Optics
Year: 2011
DOI identifier: 10.1364/OL.36.001698
OAI identifier: oai:arXiv.org:1102.5354
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