Compact dual-frequency fiber laser accelerometer with sub-μg resolution

Abstract

We demonstrate a compact and high-resolution dual-polarization fiber laser accelerometer. A spring-mass like scheme is constructed by fixing a 10-gram proof mass on the laser cavity to transduce applied vibration into beat-frequency change. The loading is located at the intensity maximum of intracavity light to maximize the optical response. The detection limit reaches 107 ng/Hz^1/2 at 200 Hz. The working bandwidth ranges from 60 Hz to 600 Hz.

Keywords

Dual-frequency fiber lasers / fiber Bragg grating / photonic accelerometers

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