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主要通过理论和实验研究相位匹配角和非共线角对三硼酸钙钇(YCOB)晶体光参量啁啾脉冲放大(OPCPA)的放大光谱产生的影响。理论上,通过数值模拟计算发现,基于YCOB-OPCPA的放大光谱对相位匹配角和非共线角的变化均比较敏感,当相位匹配角或非共线角有微小变化时,增益光谱将会出现中心波段漂移和窄化现象,但当非共线角在2.80°~2.91°之间变化时,总能找到一个理想的相位匹配角与之匹配,满足带宽大于80nm的宽带OPCPA放大。为了获得高效率宽带OPCPA放大输出,提出一种基于高精密CCD的非共线角的测量方法,并利用该方法在实验中研究了不同非共线角下YCOB晶体OPCPA的光谱增益特性,并获得宽带放大光谱,为单次OPCPA调试实验提供参考。
The effects of phase-matching angle and non-collinear angle on the amplification spectra of optical parametric chirped pulse amplification (OPCPA) of yttrium triborate (YCOB) crystal were mainly studied theoretically and experimentally. Theoretically, it is found through numerical simulation that the magnification spectrum based on YCOB-OPCPA is sensitive to the change of phase matching angle and non-collinear angle. When the phase matching angle or non-collinear angle changes slightly, the gain spectrum will appear However, when the non-collinear angle varies from 2.80 ° to 2.91 °, an ideal phase matching angle can always be found to match with the wideband OPCPA amplification with a bandwidth greater than 80 nm. In order to obtain high-efficiency wideband OPCPA amplification output, a non-collinear angle measurement method based on high-precision CCD is proposed. By using this method, the spectral gain characteristics of OPCPA under different non-collinear angles are studied and obtained Wideband amplification spectrum, for a single OPCPA debugging experiment provides a reference.