Precision angle sensor using an optical lever inside a Sagnac interferometer |
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| Authors: | Hogan J M Hammer J Chiow S-W Dickerson S Johnson D M S Kovachy T Sugarbaker A Kasevich M A |
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| Institution: | Department of Physics, Stanford University, Stanford, California 94305, USA. |
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| 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 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 subpicoradian/√Hz sensitivities with an optimized design. |
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