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arxiv: 1102.5354 · v1 · pith:753LXXBOnew · submitted 2011-02-25 · ⚛️ physics.optics

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

J. M. Hogan , J. Hammer , S.-w. Chiow , S. Dickerson , D. M. S. Johnson , T. Kovachy , A. Sugarbaker , M. A. Kasevich This is my paper
classification ⚛️ physics.optics
keywords angleleveropticalinterferometernoisesagnacsensorachieve
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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.

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