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Self-injection-locked Microcomb-Based Coherent Oscillator

Optica(2024)

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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.
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Optical Modulators,Optical Frequency Combs,On-chip Interconnects,Microresonators
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要点】:本文提出了一种基于高Q值微谐振器中的多模态相干光参量振荡器(OPO)的微梳结构,通过自注入锁定实现了具有亚赫兹线宽的可调谐相干振荡器。

方法】:通过在微梳中实现单一模式的相干振荡,利用自注入锁定技术选择一个特定的梳状线,实现相干振荡。

实验】:实验中实现了20纳米的粗调谐范围和亚赫兹级的固有线宽,并展示了该方案能够稳定微梳的重复频率,所使用的数据集未在文中明确提及。