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arXiv 2001.05777physics.optics
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$χ^{(2)}$光学微谐振器中的走离控制自启动频率梳

Walk-off controlled self-starting frequency combs in $χ^{(2)}$ optical microresonators

Sergey Smirnov, Boris Sturman, Evgeny Podivilov, Ingo Breunig

摘要:

$χ^{(3)}$光学微谐振器中的频率梳的研究是近年来的一个热点。转换为$χ^{(2)}$谐振器有望进一步发展,并带来新的挑战。这里,梳状波的产生不仅需要耦合的第一和第二谐波(FH和SH)和两个色散系数,而且还需要群速度的实质性差异-空间走离。我们预测走离控制的高度稳定的梳状生成,大大不同于已知的$χ^{(3)}$的情况下。这包括反周期状态的一般概念,形成相干的反周期稳定状态(孤子),其中FH和SH信封移动一个共同的速度没有形状变化,表征的家庭的反周期稳定状态,和梳状谱的依赖泵功率和群速度差。

英文摘要:

Investigations of frequency combs in $χ^{(3)}$ optical microresonators are burgeoning nowadays. Changeover to $χ^{(2)}$ resonators promises further advances and brings new challenges. Here, the comb generation entails not only coupled first and second harmonics (FHs and SHs) and two dispersion coefficients, but also a substantial difference in the group velocities - the spatial walk-off. We predict walk-off controlled highly stable comb generation, drastically different from that known in the $χ^{(3)}$ case. This includes the general notion of antiperiodic state, formation of coherent antiperiodic steady states (solitons), where the FH and SH envelopes move with a common velocity without shape changes, characterization of the family of antiperiodic steady states, and the dependence of comb spectra on the pump power and the group velocity difference.

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