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在闪光灯抽运的非稳腔Nd∶YAG被动调Q激光器腔内,放置非临界相位匹配KTP晶体,构成内腔式单谐振KTP光参量振荡器(OPO)。研究了输出信号光的波长调谐性能,获得1.57~1.60μm可调谐激光脉冲。实验结果表明,1.57μm信号光的输出能量随着光参量振荡器腔长的增加而减少,脉冲宽度随着腔长的增加而有所变化;抽运能量较大时,转换效率随着抽运能量的增加趋于饱和然后逐渐下降;对此给予了合理的理论解释。当光参量振荡器的腔长为5 cm,1.06μm抽运光脉冲宽度为30 ns时,输出的1.57μm信号光的脉冲宽度为2.5 ns,能量为21.3 mJ。1.57μm信号光的脉冲宽度仅为1.06μm抽运光脉冲的1/12,总的电光能量转换效率为0.128%。
A non-critical phase-matched KTP crystal is placed in a flash-pumped unstable Nd: YAG Q-switched laser cavity to form an intracavity single-resonant KTP optical parametric oscillator (OPO). The wavelength tuning performance of the output signal light was studied and a tunable 1.57 ~ 1.60μm laser pulse was obtained. Experimental results show that the output energy of 1.57μm signal light decreases with the increase of the cavity length of the optical parametric oscillator, and the pulse width changes with the increase of the cavity length. When the pumping energy is large, the conversion efficiency decreases with the pumping The increase of energy tends to be saturated and then declines gradually; this gives a reasonable theoretical explanation. When the optical parametric oscillator has a cavity length of 5 cm and a 1.06 μm pump pulse width of 30 ns, the output 1.57 μm signal pulse has a pulse width of 2.5 ns and an energy of 21.3 mJ. The pulse width of the 1.57μm signal light is only 1/12 of that of the 1.06μm pump light pulse, and the total electro-optical power conversion efficiency is 0.128%.