【作者】 李建波；

【导师】 朱祥龙；

【作者基本信息】 大连理工大学 ， 机械制造及其自动化， 2021， 硕士

【摘要】 固体激光器在国防建设、国民经济、科技研发及日常生活等领域均有广泛应用,薄管激光增益模块是固体激光器中实现高光束质量和高平均功率激光输出的关键器件。随着激光器不断向高功率和小型化方向发展,给薄管激光增益模块的机电液一体化设计提出了更高的要求,本文从理论分析、设计和试验等方面开展薄管激光增益模块研究,主要研究内容如下:(1)根据激光传输对薄管装调、冷却、密封和供电要求,确定了薄管激光增益模块的总体结构方案,选定了薄管、泵浦等结构布局和技术参数、制定了光路传输和热管理方案。(2)设计了泵浦模块和增益介质模块的结构。泵浦模块采用一通六冷却流道,解决了LD模块冷却的问题。为了保证激光的高质量输出,设计了光学镜片低应力夹持结构,以及锥面定心,端部调整的双薄管对中调整结构,实现了双薄管20μm同轴度装配要求。(3)为了消除增益模块的热效应引起的热透镜、应力、退偏和双折射等不良效应,设计了薄管内外壁冷却流道,建立了冷却流道理论模型,分析了薄管激光增益介质径向和轴向温度分布情况。结果显示在稳态时,增益介质的径向和轴向温度分布均呈现线性关系,在内壁和外壁冷却水流速分别达到2 m/s和1 m/s以上时,温度分布最均匀,为激光器的冷却水供给提供了依据。(4)搭建了薄管内壁冷却工况试验系统,分析了影响薄管冷却效果的相关因素,结果显示薄管增益介质供水冷却时,冷却水流量是影响冷却效果的关键因素,冷却水流量越大,冷却效果越好,压强对冷却效果影响较小。通过以上研究,本文完成了薄管激光增益模块的结构设计与装配,解决了光路传输对薄管装调、冷却、密封和供电要求,实现了薄管激光增益模块高功率和小型化设计目标。更多还原

【Abstract】 Solid-state lasers are widely used in fields such as national defense construction,national economy,scientific research and development,and daily life.Thin tube laser gain modules are critical components for solid-state lasers to achieve high beam quality and high average power laser output.With the continuous development of lasers in the direction of high power and miniaturization,higher requirements have been put forward for the mechatronics-hydraulic integrated design of thin tube laser gain modules.This paper carries out research on thin tube laser gain modules from theoretical analysis,design and testing.The main research contents are as follows:(1)According to the requirements of laser transmission for the assembly,cooling,sealing and power supply of the thin tube laser gain module,the overall structure of the thin tube laser gain module was determined,the structure layout and technical parameters of the thin tube and pump were selected,and the optical path transmission and thermal management program were formulated.(2)The structure of the pump module and the gain medium module are designed.The pump module adopts one-way six cooling channels,which solves the cooling problem of the LD module.In order to ensure high-quality laser output,a low-stress clamping structure for optical lenses and a double-thin tube centering adjustment structure with conical surface centering and end adjustment are designed to achieve the 20 μm coaxiality assembly requirement of the double-thin tube.(3)In order to eliminate the adverse effects such as thermal lens,stress,depolarization and birefringence caused by the thermal effect of the gain module,the cooling channel on the inner and outer walls of the thin tube was designed,the cooling channel theoretical model was established,and the radial and axial temperature distributions of the thin tube laser gain medium were analyzed.The results show that the radial and axial temperature distributions of the gain medium show a linear relationship in the steady state.When the inner wall and outer wall cooling water flow rate reach 2 m/s and 1 m/s or more,the temperature distribution is the most uniform,which provides a basis for the cooling water supply of the laser.(4)A cooling condition test system for the inner wall of a thin tube was built,and the relevant factors affecting the cooling effect of the thin tube were analyzed.The results show that when the thin tube gains medium water supply cooling,the cooling water flow is the key factor affecting the cooling effect.The larger the cooling water flow,the better the cooling effect,and the pressure has little influence on the cooling effect.Through the above research,this paper has completed the structural design and assembly of the thin tube laser gain module,solved the requirements of optical transmission for the thin tube assembly,cooling,sealing and power supply,and achieved the high power and miniaturization design goals of the thin tube laser gain module.更多还原