A co2 laser with the optimized resonator is made and to be proved by experiments . this dissertation focus on the following problems : the kinetics process of the cvl and the co2 laser , the rate equations for the laser level population , electron temperature and electron density 本文的重点是：阐述清楚铜蒸汽激光和二氧化碳激光的动力学过程，定量描述激光能级的粒子数速率方程、电子温度和电子密度等速率方程
On the basis of rate equations of frsl , power characteristics and extinction ratio of the converted light are discussed . the relation between relaxation oscillation , small - signal modulation response , modulation bandwidth and the length of fiber ring cavity is analyzed also 根据frsl满足的单模速率方程，讨论了采用frsl进行波长转换时转换光的功率特性和消光比，以及frsl的弛豫振荡特性、小信号调制响应、调制带宽与光纤环形腔长度的关系。
2 . considering the energy level structure and the spectrum characteristics of yb3 + ion , we deduce the relationships between laser performances of yb3 + - doped double clad fiber laser and parameters of laser cavity from the steady state rate equations with a new model 2 .讨论了yb3 +离子的能级结构和光谱特性,并从稳态速率方程,结合谐振腔结构特点采用ido kelson和amos hardy的模型,给出了双包层光纤激光器的输出特性与激光器谐振腔结构参数的关系准解析表达式。
A theoretical study of input and output properties of four - level solid laser was performed according to the velocity equation , and the important role of the overlap integral j , was noticed and made a fully usage in optimizing the end - pumping solid state laser parameters such as : rod length > pump position pumping and oscillating beam waist size 从四能级速率方程出发，理论推导了ld端面泵浦的固体激光器的输入输出特性，并指出重叠积分j _ 1对激光器输出特性的极大影响，从而对其在不同泵浦条件下进行分析并以此得到端面泵浦条件下固体激光器的最优化设计参数的选取方法。
After that , this paper briefly introduced the optical splitter ' s characteristics of amplication by calculate a uniformly widen three energy level ratio equation and transmission equation . since providing these theories and results , this paper began to discuss on the material characteristic and the whole craft process in short 然后，本文通过计算均匀加宽三能级结构的速率方程和传输方程，对光分路器的增益放大特性作出了一般的理论分析。在有了以上的理论计算和分析之后，本文概括地讨论了制作光分路器的材料特性和工艺过程。
The relaxation oscillation in solid - state laser with relaxation oscillation pumping is studied theoretically by the rate equation . the undulation of the laser photon density contains relaxation oscillation frequency itself and that of pumping . when those two frequencies are close , the oscillation will be resonated 我们用速率方程小信号近似方法对泵浦带有弛豫振荡的固体激光器的弛豫振荡的特性进行了系统的理论研究，发现实际光子数的起伏同时具有自身固有的弛豫振荡频率和泵浦光的弛豫振荡频率两种分量。
Quantum capture is a complicated process and capture time computation and experiment test are provided . it is difficult to ascertain carrier ' s transportation and distribution in multiply quantum wels and tunneling time and heating emitting time computations are also provided . optical gain whose formula is complicated is a critical parameter and it is useful for structuring model to obtain a concise formula by means of experiment curve 详细说明了确定半导体激光器速率方程的一些重要参量的方法，如：载流子在三维sch区的输运行为对激光器的调制特性有较大影响；量子阱对载流子的捕获是一个复杂的过程，文中给出了量子捕获时间的计算方法以及实验证明；多量子阱中载流子输运与分布也是相当复杂的问题，文中给出了隧穿时间与热发射时间的计算方法；光增益是关键的参量，它的解析式相当繁琐，由实验曲线拟合其较为简明的经验式，对定模工作是有利的。
In this work , based on the threshold condition of the fiber grating external cavity semiconductor laser ( fgesl ) which the phase of the fiber grating has been included , the effect of the temperature variation and the fg external cavity length on the lasing wavelength of the fgesl has been investigated theoretically . in addition , we have used the phase condition of fgesl to get the longitudinal mode distribution of fgesl , then the influence of the injected current on the output characteristics of fgesl has been studied 基于此，本文中利用阳实际的反射相位分布，计及半导体激光器( ld ) 、外腔及光纤光栅( fg )三者的共同作用，根据fgesl满足的闽值条件，从理论上研究了温度及外腔长度的变化对fgesl激射波长的影响;根据fgesl中纵模所满足的相位条件得到其纵模分布后，利用fgesl满足的多模速率方程，研究了ld的注入电流对fgesl输出特性的影响。
We then discuss the vibrational - rotational level transitions and the population rate equations for the laser . in addition , electron temperature , electron density and the mixtured gas temperature in the laser plasma are investigated in details . the third part is with regard to the optimal designs and the experiments of the lasers 在二氧化碳激光动力学机理的研究中，比较详细地讨论了二氧化碳激光动力学过程，给出了激光振动-转动能级跃迁及其速率方程、激光等离子体电子密度和电子温度，以及混合气体的气体温度
