Wang Mengyu, Guo Yufang, Guo Zhuang, Zhang Weiwei, Wei Bing, Du Lijun, Xie Chengfeng, Zhang Lei, He Xingdao, Shi Jiulin
Opt Express. 2025 Jul 14;33(14):29512-29526. doi: 10.1364/OE.567066.
In this study, the reversible conversion between the Kerr frequency comb and the Raman-assisted frequency comb in a packaged silica microbottle resonator structure is demonstrated both theoretically and experimentally, and the quality factor of this resonator is as high as 1.5 × 10. By deeply probing the gain between four-wave mixing and stimulated Raman scattering, the key role played by dispersion properties in the Kerr frequency comb with different free spectral range spacings and Raman broadening spectra is revealed. In the experiments, by adjusting the pump laser power and detuning amount, the stable excitation and efficient conversion of the Kerr frequency comb and Raman-assisted frequency comb are successfully realized, and broadband frequency combs with a wavelength range of up to 200 nm and tooth spacing as low as 2 nm are obtained. Numerical simulations with the aid of the generalized Lugiato-Lefever equation incorporating the Raman effect accurately reproduce the experimentally observed frequency comb conversion process, further verifying the accuracy of the theoretical model. In addition, the transition from a pure Raman frequency comb to a Raman-assisted frequency comb is observed by changing the coupling position along the axial direction to modulate the cavity dispersion, and a Raman-assisted frequency comb with a continuous bandwidth close to 250 nm is finally obtained. The study in this paper demonstrates that multifunctional optical frequency combs on silica microbottle resonator platforms have unique potential for applications in the fields of frequency conversion, precision measurement and spectroscopy.
在本研究中，从理论和实验两方面证明了在封装的二氧化硅微瓶谐振器结构中克尔频率梳与拉曼辅助频率梳之间的可逆转换，该谐振器的品质因数高达1.5×10。通过深入探究四波混频与受激拉曼散射之间的增益，揭示了色散特性在具有不同自由光谱范围间距和拉曼展宽光谱的克尔频率梳中所起的关键作用。在实验中，通过调整泵浦激光功率和失谐量，成功实现了克尔频率梳和拉曼辅助频率梳的稳定激发和高效转换，获得了波长范围高达200 nm且齿间距低至2 nm的宽带频率梳。借助包含拉曼效应的广义Lugiato-Lefever方程进行的数值模拟准确地再现了实验观察到的频率梳转换过程，进一步验证了理论模型的准确性。此外，通过沿轴向改变耦合位置来调制腔色散，观察到了从纯拉曼频率梳到拉曼辅助频率梳的转变，最终获得了连续带宽接近250 nm的拉曼辅助频率梳。本文的研究表明，二氧化硅微瓶谐振器平台上的多功能光学频率梳在频率转换、精密测量和光谱学领域具有独特的应用潜力。
