Fiber laser , as a new subject , has been developing rapidly in recent years , especially the short pulse fiber laser . because of its potential application in both optical soliton and optical time division multiplexing communication system in the future , it received more and more attention . in this paper , the author generalizes the latest development of q - switch laser and introduces the common q - switch 近年来,光纤激光器得到了迅猛的发展,特别是短脉冲光纤激光器,由于它在光孤子和光时分复用中的潜在应用,受到越来越多的关注,本文综述了常见的调q开关和光纤调q激光器最新发展情况,作者利用光纤m - z干涉仪作为q开关,实现了激光器的全光纤化,围绕光纤调q激光器进行了激光器调谐、自调q 、主动调q 、光纤激光器的模式结构等方面的研究工作。
Chapter 3 : researching the intracavity frequency - doubling of nd : yag / cr4 + : yag q - switching laser with clbo crystal . the several factors to affect the frequency doubling conversion efficiency are analyzed theoryretically . the 33 . 5 % and 46 . 8 % frequency doubling conversion efficiency are achieved in plane - concave and dual - concave resonators 理论上分析了影响倍频转换效率的几个因素，分别在平凹腔和双凹腔nd yag / cr ~ ( 4 + ) yag被动调q激光器中插入clbo进行实验研究，得到了转换效率分别为33 . 5 ， 46 . 8的绿光脉冲输出。
As a method to obtain higher sbs reflectivity by improving the monochromaticity of laser system , the ld end - pumped pulse - microchip laser operated on high - repetition and single - frequency has also been researched . in section v , we revised the previous theoretical model for passive - q - switched laser using cr4 + : nd3 + : yag by introducing the space dependence between the photons and inversion populations in microchip resonator 由于泵浦激光的线宽对sbs反射率有显著影响，而利用单纵模、高重复频率运转的脉冲微片激光器作为dpl系统种子光源来提高激光系统单色性是一种可行的技术方案。
For the ld pumped self - q - switched laser , the peak power , pulse energy , pulse width and energy extraction efficiency , which have been influenced by the loss in the cavity , cavity length and the threshold absorption coefficiency of the absorber , have been calculated . then we know how to choose the parameters of the self - q - switched laser for design 根据自调q二极管泵浦固体激光器的特点，计算了腔内损耗、腔长和饱和吸收体的初始吸收系数对于峰值功率、单脉冲能量、脉冲宽度和能量利用率的影响，并由此提出了设计自调q激光器中的参数选择规律。
