基于光学频率梳的高精度距离测量研究进展(特邀)

Progress in High-precision Distance Measurement Based on Optical Frequency Combs(Invited)

光学频率梳的输出信号在时域上表现为等间隔排列的超短脉冲序列,在频域上表现为一系列相位相干的分立谱线,可作为参考标准实现高精度的距离测量,在科研和工业领域拥有非常广阔的应用前景。文中回顾了近年来光学频率梳高精度测距研究的进展,对单光梳飞行时间法、双光梳下采样法、色散干涉法等几类典型测距方案的工作原理和代表性结果进行了阐述,并对上述方案的优势、局限性及适用的工作场景进行了分析,最后介绍了新型双光梳激光器和微腔光学频率梳在测距领域的应用以及对系统性能的提升。

Optical frequency combs are known to output uniformly-spaced ultrashort optical pulse trains in the time domain,which correspond to a series of phase-locked discrete comb lines in the frequency domain.Such unique feature makes them capable of high-precision distance measurement as a standard time-frequency reference,which is extremely promising in scientific research and industrial applications.Firstly,recent advances of high-precision distance metrology based on optical frequency combs are reviewed.Secondly,basic principles and representative results of single-comb time-of-flight method,dual-comb optical down-sampling method and dispersive interferometry method are presented in detail.Advantages,limitations and appropriate applications of each method are also analyzed.Finally,enhancement of metrology performance based on dual-comb lasers and micro-resonator frequency combs is discussed.