Tamulienė V, Stanionytė G, Latvys T, Vengelis J
Laser Research Center, Vilnius University, Vilnius, LT-10223, Lithuania.
Heliyon. 2024 Sep 6;10(18):e37513. doi: 10.1016/j.heliyon.2024.e37513. eCollection 2024 Sep 30.
Theoretical and experimental investigation of two-stage optical parametric generator based on magnesium oxide doped periodically poled lithium niobate (MgO:PPLN) crystal and optical parametric amplifier based on lithium triborate (LBO) crystal is presented. The first stage crystal was pumped by the subnanosecond fundamental harmonic at 1064 nm wavelength. In the theoretical description, the input signal and idler photons are described by the quantum model and their further amplification is tracked by simulating the nonlinear coupling equations. Such description allows the analysis of pulsed beam evolution during the propagation in the nonlinear crystal under strong pump depletion regime. The second stage crystal was seeded by the output signal wave of the first stage and pumped by the third harmonic of the laser radiation. Experimentally, tuning in the visible wavelength ranges and high pulse power (up to 20 mW at 475 nm wavelength) were achieved.
本文介绍了基于氧化镁掺杂的周期性极化铌酸锂（MgO:PPLN）晶体的两级光学参量发生器以及基于硼酸锂（LBO）晶体的光学参量放大器的理论和实验研究。第一级晶体由波长为1064nm的亚纳秒基波谐波泵浦。在理论描述中，输入信号光子和闲频光子由量子模型描述，并通过模拟非线性耦合方程跟踪它们的进一步放大。这种描述允许分析在强泵浦耗尽 regime 下脉冲光束在非线性晶体中传播时的演化。第二级晶体由第一级的输出信号波注入种子，并由激光辐射的三次谐波泵浦。实验上，实现了在可见波长范围内的调谐和高脉冲功率（在475nm波长处高达20mW）。
