Affiliation:
1. Chalmers University of Technology
Abstract
Narrow-linewidth yet tunable laser oscillators are one of the most
important tools for precision metrology, optical atomic clocks,
sensing, and quantum computing. Commonly used tunable coherent
oscillators are based on stimulated emission or stimulated Brillouin
scattering; as a result, the operating wavelength band is limited by
the gain media. Based on nonlinear optical gain, optical parametric
oscillators (OPOs) enable coherent signal generation within the whole
transparency window of the medium used. However, the demonstration of
OPO-based Hertz-level linewidth and tunable oscillators has remained
elusive. Here, we present a tunable coherent oscillator based on a
multimode coherent OPO in a high-Q microresonator, i.e., a
microcomb. Single-mode coherent oscillation is realized through
self-injection locking (SIL) of one selected comb line. We achieve
coarse tuning up to 20 nm and an intrinsic linewidth down to
sub-Hertz level, which is three orders of magnitude lower than the
pump. Furthermore, we demonstrate that this scheme results in the
repetition rate stabilization of the microcomb. These results open
exciting possibilities for generating tunable coherent radiation where
stimulated emission materials are difficult to obtain, and the
stabilization of microcomb sources beyond the limits imposed by the
thermorefractive noise in the cavity.
Funder
European Research Council
Vetenskapsrådet
Air Force Office of Scientific
Research
Jilin Province
Cited by
1 articles.
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