Impact of stimulated Raman scattering on dark soliton generation in a silica microresonator.
Impact of stimulated Raman scattering on dark soliton generation in a silica microresonator.
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DOI：
10.1088/2515-7647/aca8e1
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发表时间：
2023-01-01
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在任意波长处产生相干光频率梳对于诸如精密光谱学和光通信的领域是重要的。暗孤子是正常色散微谐振腔中光频梳的相干态，可以扩展光频梳的工作波长范围。虽然暗孤子的存在和动力学已被广泛研究，在近可见光波长的强拉曼相互作用的存在下访问孤子状态的模式相互作用的要求已较少探索。在这里，在石英微谐振器的参数和拉曼增益的分析进行，揭示了四波混频参数增益，可以创建一个模式相互作用辅助的附加频移是能够超过拉曼增益。在给定的模式耦合条件下，分析了暗孤子的存在范围与泵浦功率和失谐量的关系。我们预计这些结果将有利于领域需要高效率和可选波长的光频梳，如生物传感应用，使用二氧化硅微腔，具有较强的拉曼增益在正常的色散制度。
Generating a coherent optical frequency comb at an arbitrary wavelength is important for fields such as precision spectroscopy and optical communications. Dark solitons which are coherent states of optical frequency combs in normal dispersion microresonators can extend the operating wavelength range of these combs. While the existence and dynamics of dark solitons has been examined extensively, requirements for the modal interaction for accessing the soliton state in the presence of a strong Raman interaction at near visible wavelengths has been less explored. Here, analysis on the parametric and Raman gain in a silica microresonator is performed, revealing that four-wave mixing parametric gain which can be created by a modal-interaction-aided additional frequency shift is able to exceed the Raman gain. The existence range of the dark soliton is analyzed as a function of pump power and detuning for given modal coupling conditions. We anticipate these results will benefit fields requiring optical frequency combs with high efficiency and selectable wavelength such as biosensing applications using silica microcavities that have a strong Raman gain in the normal dispersion regime.