Nakajima Yoshiaki, Nishiyama Akiko, Minoshima Kaoru
Opt Express. 2018 Feb 19;26(4):4656-4664. doi: 10.1364/OE.26.004656.
We developed a mode-filtering technique based on the all-fiber-based external cavity for a fiber-based optical frequency comb for high repetition rate (f) frequency comb, and the carrier envelope offset frequency (f) can be detected and stabilized and is robust to environmental fluctuations. To achieve multiplication of the f with a high multiplication factor using the fiber ring cavity, a long fiber was developed to mitigate the physical limitation inhibiting the shortening of the cavity length. In this study, the length of the fiber cavity was set to 6.7 m (free spectral range = 44.7 MHz) as the fiber-based comb length was 6.1 m. We were able to demonstrate a multiplication factor of 11, i.e., f increased from 48.7 MHz to 536.0 MHz with a side mode suppression ratio of about 25 dB using the double-pass configuration.
我们为基于光纤的光学频率梳开发了一种基于全光纤外腔的模式滤波技术，用于高重复率（f）频率梳，并且载波包络偏移频率（f）可以被检测和稳定，并且对环境波动具有鲁棒性。为了使用光纤环形腔以高倍频因子实现f的倍频，开发了一种长光纤以减轻抑制腔长度缩短的物理限制。在本研究中，由于基于光纤的梳状发生器长度为6.1 m，光纤腔的长度设置为6.7 m（自由光谱范围 = 44.7 MHz）。我们能够证明倍频因子为11，即使用双通配置时，f从48.7 MHz增加到536.0 MHz，边模抑制比约为25 dB。
