【摘要】 设计了一种基于主振荡功率放大（MOPA）结构的激光二极管（LD）泵浦窄脉宽高功率固体激光器。主振荡级采用掺钕钒酸钇（Nd:YVO₄）晶体作为激光工作物质，结合磷酸钛氧铷电光调Q器件，分析了高重频激光脉宽特性，实现了主振荡级窄脉宽输出；功率放大级采用LD双端泵浦Nd:YVO₄晶体结构，通过建立三维热仿真模型，对比分析了LD单端泵浦和LD双端泵浦激光工作物质的热效应，并讨论了在双端泵浦条件下，LD泵浦光斑、激光工作物质长度等因素对功率放大级热效应的影响。在实验中优化激光器参数，主振荡功率放大后，当重复频率10 kHz时，得到了最大平均功率为22.01 W、脉冲宽度为4.33 ns的1 064 nm激光输出，对应的光-光转换效率为18.21%。更多还原

【Abstract】 A laser diode（LD） pumped, narrow-pulse-width, high-power solid-state laser was designed using a master oscillator power amplifier（MOPA） configuration. The master oscillator stage utilizes a neodymium-doped yttrium orthovanadate（Nd: YVO₄） crystal as the laser gain medium in combination with a rubidium titanyl phosphate（RTP） electro-optic Q-switch. The pulse width characteristics at high repetition rates were analyzed, yielding narrow pulse width output from the master oscillator stage. The power amplifier stage employes a configuration that features LD dual-end pumping of the Nd:YVO₄ crystal. A three-dimensional thermal simulation model was established to comparatively analyze the thermal effects in the gain medium under LD single-end and dual-end pumping. The influence of LD pump spot size and gain medium length on thermal effects in the power amplifier stage under dual-end pumping was investigated. Following experimental optimization of the laser parameters, the MOPA system achieved a maximum average power of 22.01 W with a pulse width of 4.33 ns at a wavelength of 1 064 nm and a repetition frequency of 10 kHz. The corresponding optical-to-optical conversion efficiency was 18.21%.更多还原