基于高Q、反常色散微泡微腔的可见光波段光频梳产生与调控方法

In the band of visible wavelengths, the dispersion of most the existing Kerr microcavities is under the normal dispersion region, which makes it difficult to excite the optical frequency comb efficiently at visible wavelengths due to the effects of nonlinear optics such as four-wave mixing. The key scientific problem for frequency comb generation at visible wavelengths is how the manage the dispersion and quality factor of Kerr microcavity. Previous theoretical studies show that the microbubble-based microcavity has the merit of anomalous dispersion characteristic at visible wavelengths and utilizing such kind of microcavity maybe is a potential way for frequency comb generation at visible wavelengths. The research difficulty of the management of high qulality and dispersion of Kerr microcavity is how to build a theoretical model of frequency comb generation at visible wavelengths, and improve the thickness, uniformity and symmetry of the microbubble. In the previous work, based on the unique thinking of critical-state pressure-assisted arc discharge technology, the applicant has fabricated a new single-ended bubble microcavity and evalated its perpformance first time to the best of our knowledge. Corresponding, this fund focus on the following three key points, which including the mechanism and realization way of frequency comb generation by utilization of microbubble-based Kerr microcavity; the inherent theory and key technologies on the fabrication of high-Q,anomalous dispersion microbubble and frequency comb generation at visible wavelengths that based on the improved critical-state pressure-assisted arc discharge technology; the management methods on the dispersion fine adjustment and the frequency comb spectrum by controlling the filled pressure and the outer temperature. Those studies are expected to provide a feasible way for the frequency comb generation at visible wavelengths.

现有Kerr微腔在可见光波段大都为正常色散，导致难以有效激发四波混频等非线性效应产生可见光频梳。如何调控Kerr微腔色散与品质因子特性是实现可见光频梳产生的关键科学问题。理论研究证明，超薄微泡结构微腔可望在可见光波段实现反常色散特性，是产生可见光频梳的一个潜在可行途径。如何构建微泡微腔光频梳产生理论模型，并有效改善微泡膜层薄度、均匀度及对称性是调控微腔色散、品质因子特性及产生光频梳的研究难点。申请人之前已经基于独特的临界态膨胀辅助放电思路实现了高品质因子、超薄单端微泡微腔的制备与特性表征。在此基础上，本项目拟分析微泡结构Kerr微腔产生可见光频梳的机理与实现途径；研究基于改进的临界态膨胀辅助放电法制备高品质因子、反常色散空心微泡Kerr微腔和产生可见光波段光频梳的内在机制与关键技术；并探索基于压强/温度控制的微腔色散精细调节及光频梳频谱调控方法。研究内容可望为可见光频梳产生提供一可行途径。

现有Kerr微腔在可见光波段大都为正常色散，导致难以有效激发四波混频等非线性效应产生可见光频梳。如何调控Kerr微腔色散与品质因子特性是实现可见光频梳产生的关键。超薄微泡结构微腔可以在可见光波段实现反常色散特性，是产生可见光频梳的一个潜在可行途径。构建微泡微腔光频梳产生理论模型，并有效改善微泡膜层薄度、均匀度及对称性是调控微腔色散、品质因子特性及产生光频梳的研究难点。本项目基于独特的临界态膨胀辅助放电思路实现了高品质因子、超薄单端微泡微腔的制备与特性表征，分析了微泡结构Kerr微腔产生可见光频梳的机理与实现途径；研究了基于改进的临界态膨胀辅助放电法制备高品质因子、反常色散空心微泡Kerr微腔和产生可见光波段光频梳的内在机制与关键技术；并探索了基于压强/温度控制的微腔色散精细调节及光频梳频谱调控方法。研究内容可为可见光频梳产生提供一可行途径。