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arXiv · 1707.09085

A self-tuning optical resonator

Joanna A. Zielinska·Morgan W. Mitchell
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Abstract

We demonstrate a nonlinear optical resonator that tunes itself onto resonance with an input beam. In a monolithic Fabry-Perot cavity implemented in rubidium-doped periodically-poled potassium titanyl phosphate, an intensity-dependent refractive index produces line-pulling by multiple free-spectral ranges (FSRs). In this condition, the cavity passively maintains optical resonance in the face of FSR-scale excursions of the drive laser frequency: when one resonant operating-point becomes unstable, the resonator rapidly transitions to another resonant operating point. We demonstrate stable second-harmonic generation with no active feedback to laser or cavity. The self-tuning effect appears to be supported by a very strong, previously unreported optical nonlinearity.

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Joanna A. Zielinska, Morgan W. Mitchell. 2018-01-06. A self-tuning optical resonator. https://doi.org/10.1364/ol.42.005298

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