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arXiv 2007.05287physics.optics
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$χ^{(2)}$光学微谐振器中频率梳产生的阈值

Frequency comb generation threshold in $χ^{(2)}$ optical microresonators

Jan Szabados, Boris Sturman, Ingo Breunig

摘要:

从理论和实验上研究了锂酸盐回音壁微谐振器中产生$χ^{(2)}$频率梳的阈值。当通过二次谐波产生产生频率梳时,发现导致梳的级联二阶过程的开始的阈值约为85 $μ$ W。的二次谐波产生效率达到这个值是在一个先前已知的理论框架非常一致。这个框架在这里扩展,表明级联$χ^{(2)}$过程的发病和二次谐波产生效率的最大值相吻合。此外,我们观察到梳状线之间的频率距离是泵浦功率的函数。它从振荡阈值的4个自由光谱范围变为590 $μ$ W的1个自由光谱范围。

英文摘要:

We investigate the threshold of $χ^{(2)}$ frequency comb generation in lithium niobate whispering gallery microresonators theoretically and experimentally. When generating a frequency comb via second-harmonic generation, the threshold for the onset of cascaded second-order processes leading to a comb is found to be approximately 85 $μ$W. The second-harmonic generation efficiency up to this value is in excellent agreement with a previously known theoretical framework. This framework is extended here, showing that the onset of cascaded $χ^{(2)}$ processes and the maximum of the second-harmonic generation efficiency coincide. Furthermore, we observe that the frequency distance between the comb lines is a function of the pump power. It changes from 4 free spectral ranges at the oscillation threshold to 1 free spectral range at 590 $μ$W.

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