1064nm纳秒激光脉冲激发的外腔式PbWO4拉曼激光器

研究了外腔式PbWO4拉曼激光器在纳秒脉冲抽运下的输出特性。利用主动调Q的Nd:YAG激光器产生的脉冲宽度为31.4ns,最大输出能量为200mJ的1064nm激光作为抽运源。拉曼激光谐振腔采用的是平凹腔设计。测量了输出的拉曼光脉宽与抽运能量的关系,分析了输出的拉曼光脉冲波形图和光谱图,测量了输出的拉曼光脉冲能量与抽运能量的关系,计算了转换效率与抽运能量的关系。当注入抽运光能量达到42mJ时,得到了一阶斯托克斯光脉冲的最大能量和转换效率分别为10mJ和24%,获得外腔式PbWO4拉曼激光器的一阶斯托克斯光脉冲波长为1177.6nm,典型的一阶斯托克斯光脉冲脉宽为20ns。

External Resonator PbWO4 Raman Laser Excited by 1064 nm Nanosecond Laser Pulses

Output charactaristic of external resonator PbWO4 Raman laser excited by nanosecond pulse is studied. An actively Q-switched Nd:YAG laser is used as the pumping source, with pulse width of 31.4 ns and the maximum output energy of 200 mJ at 1064 nm. The Raman laser cavity is a flat-concave one. The relation between the pulse width of output Raman pulses and pumping energy is measured. The optical spectra and the pulse waveforms of Raman pulses are analyzed. The relation between the energy of output Raman pulses and pumping energy is measured, and the relation between the conversion efficiency and pumping energy is calculated. When the pumping energy is 42 mJ, the obtained maximum output energy and conversion efficiency of first-Stokes pulse are 10 mJ and 24%, respectively. The wavelength of the first-Stokes pulse of the Raman laser is 1177.6 nm. The typical pulse width the of the first-Stokes pulses is 20 ns.