Abstract

We show that a laser diode can serve as both the emitter and detector in a diffraction-based magneto-optic rotation sensor. Self-detection devices have sufficient linearity and stability for applications with discrete measurands. Signal-to-noise ratios greater than 50 dB (1 Hz bandwidth) are possible for binary measurands, and a fiber optic rotation sensor with a signal-to-noise ratio of 18 dB in a 1.25 kHz bandwidth is demonstrated.

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