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A Precision Angle Sensor using an Optical Lever inside a Sagnac Interferometer
Published 25 Feb 2011 in physics.optics | (1102.5354v1)
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 / Hz1/2 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 / Hz1/2 sensitivities with an optimized design.
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