Yan Enqi, Peng Mingliang, Tang Jian, Huang Jiyuan, Tian Donglai, Liu Suyang, Meng Zhijun, Li Xianbin, Zhu Lingxiao, Yan Shuhua, Wang Guochao
College of Intelligence Science and Technology, National University of Defense Technology, Changsha 410073, China.
Micromachines (Basel). 2025 Apr 10;16(4):448. doi: 10.3390/mi16040448.
The high-repetition-rate dual-microcomb interferometry, characterized by its high precision, rapid measurement speed, and ease of integration, shows significant promise in applications such as precision spectroscopy and high-speed precision ranging. As dual-microcomb interferometry usually requires a specific difference in repetition rates, tuning the repetition rate of the microcomb is crucial for integrating dual-microcomb sources and enhancing the measurement performance, including the precision and the update rate. This work demonstrates a coherent dual-microcomb system driven by a single continuous-wave fiber laser at 1560.49 nm. The system employs a hybrid tuning method combing single-sideband (SSB) modulation for precision pump frequency control (enabling continuous repetition rate tuning across a 4.34 MHz range) with thermal control for coarse tuning. The linear dependence between the repetition rate and pump modulation frequency shows a measured coefficient of 143.58 kHz/GHz. This method enables dual microcombs with MHz-level repetition rate tuning, significantly relaxing the fabrication and pairing requirements for microresonators. The advancement is particularly valuable for dual-comb spectroscopy and ranging applications, including gas detection and satellite formation flying.
高重复率双微梳干涉测量技术具有高精度、快速测量速度和易于集成的特点，在精密光谱学和高速精密测距等应用中显示出巨大的潜力。由于双微梳干涉测量通常需要特定的重复率差异，因此调整微梳的重复率对于集成双微梳源和提高测量性能（包括精度和更新率）至关重要。这项工作展示了一种由1560.49 nm的单连续波光纤激光器驱动的相干双微梳系统。该系统采用了一种混合调谐方法，将用于精确泵浦频率控制的单边带（SSB）调制（能够在4.34 MHz范围内进行连续重复率调谐）与用于粗调谐的热控制相结合。重复率与泵浦调制频率之间的线性依赖关系显示，测量系数为143.58 kHz/GHz。这种方法能够实现具有MHz级重复率调谐的双微梳，显著放宽了微谐振器的制造和配对要求。这一进展对于双梳光谱学和测距应用，包括气体检测和卫星编队飞行，尤其有价值。
