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基于激光二极管侧面抽运棒状放大器的方式,研制了一台应用于空间碎片探测的高重复频率、高光束质量焦耳级的Nd:YAG纳秒激光器.激光器采用主振荡功率放大的结构,主要包括单纵模种子、预放大单元、受激布里渊散射相位共辄光束控制单元和能量提取单元四部分.在能量提取单元,为了减小热效应对光束质量的影响,降低了放大器的工作电流,采用了分束-放大-合束的方案.在重复频率100 Hz,单纵模种子注入单脉冲能量10.73μJ的条件下,获得了3.31 J的能量输出.输出激光的脉冲宽度为4,58 ns,远场光束质量为2.12倍衍射极限,能量稳定性(BMS)为0.87%.
A Nd: YAG nanosecond laser with high repetition rate and high beam quality was developed based on the laser diode side-pumping rod amplifier.The main oscillator consists of a single Longitudinal mode seed, preamplifier unit, stimulated Brillouin scattering phase co-beam control unit and energy extraction unit 4. In the energy extraction unit, in order to reduce the influence of thermal effect on the beam quality and reduce the operating current of the amplifier, The beam splitting-amplifying-combining scheme was achieved.The energy output of 3.31 J was obtained under single-pulse mode energy of 10.73 μJ with 100 Hz repetition rate.The pulse width of output laser was 4.58 ns, The far-field beam quality is 2.12 times the diffraction limit, and the energy stability (BMS) is 0.87%.