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在灯泵Ce:Nd:YAG双掺晶体水冷激光器中,用高损伤阈值的新型电光晶体硅酸镓镧(La3Ga5SiO14)作为Q开关,采用场效应管快速Q开关驱动电路,实现了20Hz脉冲重复频率的稳定1.064μm基频激光输出,在基频激光腔外设计了光参变激光谐振腔,用KTP晶体进行光参变转换,基于Ⅱ类非临界相位匹配条件,实现了1.57μm人眼安全激光输出。研究了YAG晶体棒安装应力对1.57μm输出的影响,发现由应力引起的双折射效应可使光参变转换效率严重降低,分析了效率降低的原因,给出了等效应力与光参变转换效率的关系曲线,测试得到所设计激光器的光参变转换效率最高点,在20Hz脉冲重复频率下,当1.064μm激光脉冲能量为220mJ时,1.57μm激光脉冲能量为109.3mJ,最高达到了近50%的光参变转换效率,脉冲宽度为4.3ns,束散角为8.1mrad,此时电抽运注入为11.3J,总电光效率为0.96%,进一步增大1.064μm激光能量时,光参变转换效率会缓慢下降。激光器输出稳定性优于5%,结构紧凑,通过了温度、振动、冲击等主要环境试验技术指标考核,实现了工程化应用。
In the light pump Ce: Nd: YAG double-doped water-cooled laser, a high damage threshold of the new type of electro-optical crystal lanthanum silicate (La3Ga5SiO14) as the Q switch FET Q-switching drive circuit using fast, 20Hz pulse repetition frequency The stable 1.064μm fundamental frequency laser output was designed. An optical parametric laser resonator was designed outside of the fundamental laser cavity. The KTP crystal was used to conduct the optical parametric transformation. Based on the class Ⅱ non-critical phase matching conditions, a 1.57μm human eye-safe laser Output. The effect of YAG crystal rod mounting stress on the output of 1.57μm was studied. It was found that the birefringence effect caused by stress seriously degrade the optical parametric conversion efficiency, and the reason for the decrease in efficiency was analyzed. The equivalent stress and optical parametric transformation Efficiency curve, the highest point of the optical parametric conversion efficiency of the designed laser was obtained. At the pulse repetition frequency of 20Hz, when the 1.064μm laser pulse energy was 220mJ, the energy of 1.57μm laser pulse was 109.3mJ and the maximum reached nearly 50 % Of the optical parametric conversion efficiency, the pulse width of 4.3ns, beam divergence angle of 8.1mrad, this time the electric pumping injection was 11.3J, the total electro-optical efficiency of 0.96%, further increase 1.064μm laser energy, Conversion efficiency will slowly decline. Laser output stability of better than 5%, compact structure, passed the temperature, vibration, impact and other major environmental test technical indicators assessment, to achieve the engineering application.