理论研究空间烧孔、色散和克尔非线性效应对激光调频梳的影响。

Theory of Frequency-Modulated Combs in Lasers with Spatial Hole Burning, Dispersion, and Kerr Nonlinearity.

机构信息

Institute of Solid State Electronics, TU Wien, Gusshausstrasse 25-25a, 1040 Vienna, Austria.

出版信息

Phys Rev Lett. 2019 Dec 13;123(24):243902. doi: 10.1103/PhysRevLett.123.243902.

DOI:10.1103/PhysRevLett.123.243902

PMID:31922862

Abstract

Frequency-modulated (FM) frequency combs constitute an exciting alternative to generate equidistant spectra. The full set of Maxwell-Bloch equations is reduced to a single master equation for lasers with fast gain dynamics to provide insight into the governing mechanisms behind phase locking. It reveals that the recently observed linear frequency chirp is caused by the combined effects of spatial hole burning, group velocity dispersion, and Kerr nonlinearity due to asymmetric gain. The comparison to observations in various semiconductor lasers suggests that the linear chirp is general to self-starting FM combs.

摘要

调频（FM）梳状频率构成了一种令人兴奋的替代方案，可用于生成等距光谱。对于具有快速增益动力学的激光器，将完整的麦克斯韦-布洛赫方程组简化为单个主方程，以深入了解相位锁定背后的控制机制。结果表明，最近观察到的线性频率啁啾是由空间烧孔、群速度色散和由于非对称增益导致的克尔非线性的综合影响引起的。与各种半导体激光器的观察结果进行比较表明，线性啁啾是自启动 FM 梳状的普遍现象。