Fano resonance from backscattering in a magnesium fluoride crystalline cavity for laser frequency locking.

Authors

Wenling Sun, Hao Wang, Jianing Zhang, Jun Guo, Haotian Wang

Published in

Optics letters. Volume 51. Issue 15. Pages 4408-4411. Aug 01, 2026.

Abstract

We report the Fano resonance induced by backscattering in a MgF₂ WGM cavity. The reflected light from the tapered fiber end facet acts as the continuum in Fano interference, with its phase adjustable to produce various Fano lineshapes. We modeled this effect and identified the optimal parameters for laser frequency locking. With the high-Q factor and low thermal noise of the MgF₂ WGM cavity, effective suppression of laser frequency noise was achieved. This work demonstrates a compact, robust, modulation-free laser frequency-locking method for miniaturized low-noise lasers.

PMID:
42537201
Bibliographic data and abstract were imported from PubMed on 01 Aug 2026.

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