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利用重复频率为1kHz的钛宝石激光的倍频蓝光抽运Ⅰ类相位匹配的偏硼酸钡(BBO)晶体,获得了可见光区的非共线参量超荧光.给出了最强光强处参量超荧光的非共线角,波长随相位匹配角的变化.理论计算了在参量超荧光中三波的群速失配随非共线角和相位匹配角的变化规律.结果表明,Ⅰ类非共线相位匹配的参量超荧光关于抽运光中心对称.并且沿光强最强的参量超荧光方向三波的群速失配最小,有效互作用长度最大,即参量超荧光的强度角分布是三波的相速和群速自匹配的结果.该理论和实验研究为减小飞秒光参量放大中三波的群速失配提供了一个理想的几何模型,为获得高增益、窄脉冲宽度的参量光输出提供了理论依据和实验验证.
Non-collinear parametric hyperfluorescence in the visible region was obtained by phase-shifted phase-matched barium metaborate (BBO) crystals using frequency-doubled blue light of a Ti: Sapphire laser at a repetition rate of 1 kHz. The non-collinear angle of fluorescence and the change of the wavelength with the phase matching angle.The variation of three-wave group velocity mismatch with the non-collinear angle and phase matching angle in the parametric superfluorescence was calculated theoretically.The results show that the non- The phase-matched parametric hyperfluorescence is symmetrical about the center of the pumping light, and the group velocity mismatch with the three waves in the superfluorescent direction with the strongest light intensity is the smallest with the largest effective interaction length, ie, the intensity angular distribution of the parametric hyperfluorescence is a three-wave phase Speed and group velocity self-matching results.This theoretical and experimental study provides an ideal geometric model for reducing the group velocity mismatch of the three waves in the femtosecond optical parametric amplification and provides a parametric optical output with narrow pulse width for high gain The theoretical basis and experimental verification.