高平均功率光纤激光技术基础: (2) 谐振腔

概述光纤激光谐振腔的基本结构、主要组件及其功能，介绍高功率光纤激光谐振腔的发展现状。以光纤光栅为研究载体分析谐振腔时空频域多维特性。从中心波长、线宽和形态三个方面介绍谐振腔输出光谱特性调控的机理、方法与研究进展；从本征模与反射谱的关联角度介绍谐振腔输出模式调控的机理、方法与研究进展；介绍谐振腔瞬态时域特性建模的最新成果，指出时频特性的关联及其对非线性效应产生的影响。最后介绍两种无腔结构的高功率光纤激光。

Fundamentals of high-average-power fiber laser technology: (ii) oscillation cavity

The basic setup, main components and their functions of a fiber laser oscillator are briefly introduced, and the current development status of fiber oscillator is presented. The temporal, spatial and spectral properties of the oscillator are analyzed based on the Fiber Bragg grating(FBG). The mechanism, method and progress in manipulation of the central wavelength, linewidth and shape of the output of the oscillator are introduced. The mechanism, method and progress in manipulation of the output mode of the oscillator are introduced via the relationship between the eigen mode and the reflection spectrum. Recent progress of the instantaneous temporal property modeling is shown, the relationship between temporal and spectral properties and their influence on the nonlinear effect are revealed. Two kinds of cavity-free high power fiber lasers are briefly discussed.