亚纳秒被动调Q1064nm激光器的研究

发布时间：2018-11-21 08:15

【摘要】：亚纳秒高峰值功率的DPL全固态激光器在激光加工,激光雷达,医疗,非线性光学和科研领域得到了广泛的应用。特别是在加工领域,具有热作用范围小,精度高,速度快等特点。本论文针对亚纳秒的1064nm脉冲激光光源,对被动调Q获得亚纳秒1064nm激光的输出进行理论与实验的研究。首先介绍了Cr:YAG晶体的能级结构、光谱特性,根据Cr:YAG的饱和吸收特性,模拟研究了在不同初始透过率下,Cr:YAG透过率随光功率密度的变化规律。通过求解被动调Q速率方程,得出了单脉冲能量,峰值功率,脉冲宽度的表达式,从脉冲宽度的表达式出发,模拟研究了输出镜反射率、饱和吸收体Cr:Y:AG初始透过率、腔长对脉冲宽度的变化规律,以及单脉冲能量,峰值功率随输出镜反射率的变化规律。实验研究了谐振腔长度、输出镜透过率、饱和吸收体Cr:YAG初始透过率对脉冲宽度的影响,输出镜透过率对峰值功率和单脉冲能量的影响,饱和吸收体Cr:YAG初始透过率对峰值功率和单脉冲能量的影响,以及重复频率对脉冲宽度和单脉冲能量的影响。完成了端面泵浦Nd:YAG/Cr:YAG键合晶体被动调Q激光器原理样机设计与研制,在泵浦峰值功率为29W,泵浦脉宽为370μs,重复频率为500Hz的情况下,获得了脉宽0.99ns,单脉冲能量450μJ,线宽0.0624nm的激光输出,光-光转化效率为4.2%。
[Abstract]:Sub-nanosecond high peak power DPL all-solid-state lasers have been widely used in laser processing, lidar, medical, nonlinear optics and scientific research. Especially in the field of processing, it has the characteristics of small range of thermal action, high accuracy and high speed. In this paper, the output of subnanosecond 1064nm laser is studied theoretically and experimentally for the subnanosecond 1064nm pulse laser source. Firstly, the energy level structure and spectral characteristics of Cr:YAG crystal are introduced. According to the saturation absorption characteristics of Cr:YAG, the variation of Cr:YAG transmittance with optical power density at different initial transmittance is simulated and studied. By solving the passively Q-switched rate equation, the expressions of single pulse energy, peak power and pulse width are obtained. Based on the expression of pulse width, the reflectivity of output mirror and the initial transmittance of saturated absorber Cr:Y:AG are simulated. The variation of the cavity length to the pulse width and the variation of the single pulse energy and the peak power with the reflectivity of the output mirror. The effects of the cavity length, the transmittance of the output mirror, the initial transmittance of the saturated absorber Cr:YAG on the pulse width, and the influence of the transmission rate of the output mirror on the peak power and monopulse energy are experimentally studied. The effect of initial transmittance of saturated absorber Cr:YAG on peak power and single pulse energy, and the effect of repetition rate on pulse width and single pulse energy. The principle prototype of end-pumped Nd:YAG/Cr:YAG bonded crystal passively Q-switched laser is designed and developed. When the pump peak power is 29W, the pump pulse width is 370 渭 s, the repetition rate is 500Hz, the pulse width is 0.99ns. The laser output of single pulse energy 450 渭 J and linewidth 0.0624nm is 4. 2%.
【学位授予单位】：长春理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN248

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