WGMR Self-Injection Locking Method Based on Enhanced Optical Feedback with Auxiliary Prism
arxiv(2024)
摘要
The optical feedback intensity is an important parameter for realizing narrow
linewidth lasers in Whispering-gallery-mode resonator (WGMR) self-injection
locking technology. We proposed an approach that enhances the intensity of
intracavity feedback in crystalline WGMR by using only a single coated
auxiliary prism. Compared to the Rayleigh scattering, the feedback intensity of
the enhanced scheme increased by more than a hundred times. Furthermore, we
demonstrated that, with the enhanced approach, the instantaneous linewidth of
the laser was suppressed to 7 Hz level, the locking range was expanded up to 8
GHz, and the relative intensity noise (RIN) was reduced to -152 dBc/Hz@10MHz.
The feedback enhanced design is compact, easy-to-operated and can be integrated
with the WGMR. It provides a miniaturized solution for controlling optical
feedback intensity in WGMR self-injection locking technology.
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