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为了获得更高功率的输出激光脉冲,需要将注入到主放大链的种子脉冲进行光谱整形来补偿放大过程中的增益窄化效应。利用展宽器中啁啾脉冲的光谱具有空间排布的特点,采用石英晶体平凸透镜空间光强度调制器间接地实现窄带激光脉冲的光谱整形,在展宽器的输出端获得了光谱呈平顶分布的种子啁啾脉冲。通过调节偏振片的透偏方向,可方便地调谐输出脉冲光谱的形状。
In order to obtain a higher power output laser pulse, the seed pulse injected into the main amplification chain needs to be spectrum-shaped to compensate for the gain narrowing effect during amplification. The spectrum of the chirped pulse in the stretcher has the characteristics of spatial arrangement. The spectral shaping of the narrow-band laser pulse is indirectly achieved by using the quartz crystal plano-convex lens spatial light intensity modulator. The output of the stretcher has a flat-topped distribution Seed chirp pulse. By adjusting the polarization direction of the polarizer, the shape of the output pulse spectrum can be easily tuned.