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对非共线相位匹配LBO晶体飞秒光参变放大器进行了系统地分析和理论研究 ,用数值方法得出了非共线角、相位匹配角、增益和增益带宽之间的关系 ,给出了放大器设计的各种最优化参量。研究结果表明 ,这种参变放大器不仅可以实现较高的参变增益和获得极宽的增益带宽 ,还具有较大的参变允许角、较小的走离角和小的群速色散 ,因此这种参变放大器对于以纳秒级高功率激光作为抽运光 ,利用光参变啁啾脉冲放大 (OPCPA)技术高效率参变放大飞秒脉冲产生 10 12 W甚至 10 15W级的超强超短激光脉冲具有重要的意义。建立的理论模型具有普遍意义 ,也为其他类似的参变过程提供了重要的理论依据
The non-colinear phase-matched LBO crystal femtosecond optical parametric amplifier has been systematically analyzed and theoretically studied. The relationship between non-collinear angle, phase matching angle, gain and gain bandwidth has been obtained numerically. Amplifier design of the various optimization parameters. The results show that this kind of parametric amplifier can not only achieve higher parametric gain and gain a very wide gain bandwidth, but also have larger parametric admittance, smaller walk-off angle and small group velocity dispersion This parametric amplifier uses pumped nanosecond high power laser as pumping light and uses optical parametric chirped pulse amplification (OPCPA) to efficiently amplify and amplify femtosecond pulses to generate 1012W or even 10W Short laser pulses have important implications. The established theoretical model has universal significance and also provides important theoretical basis for other similar process of change