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

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.

3 pages, 4 figures

References in corpus (3)

• Ultrasensitive Beam Deflection Measurement via Interferometric Weak Value Amplification
• Optimizing the Signal to Noise Ratio of a Beam Deflection Measurement with Interferometric Weak Values
• Interferometric weak value deflections: quantum and classical treatments

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