中红外光学频率梳:进展与应用（特邀）

光学频率梳是一种宽谱的相干光源，由一系列等频率间隔的离散谱线组成，具有超高的时频精度。自诞生以来，光学频率梳为精密光谱学、光学测量、相干光通信、光时钟等多种应用的发展带来了革命性的变化。近年来，研究人员通过新型激光增益介质、非线性频率转换和微谐振腔等技术将频率梳扩展到中红外光谱区域(2~20 μm)，进一步扩大了光频梳的应用范围。文中全面介绍了中红外光频率梳的产生机制、最新进展及应用。

Mid-infrared optical frequency combs: Progress and applications (Invited)

Optical frequency comb is a kind of broad spectrum coherent light source, which is composed of a series of discrete spectral lines with equal frequency interval and has ultrahigh time-frequency accuracy. Since its birth, optical frequency comb has brought revolutionary changes to the development of precision spectroscopy, optical measurement, coherent optical communication, optical clock and other applications. In recent years, researchers have extended the frequency comb to the mid-infrared spectrum region (2-20 μm) by using novel laser gain media, nonlinear frequency conversion and micro-resonator techniques, and further expand the application range of optical frequency comb. In this paper, the generation mechanism, latest development and application of mid-infrared frequency comb are introduced.