A method is proposed for enhancing the time-domain contrast of femtosecond laser pulses under nonlinear pulse compression by means of spectrum broadening due to the self-phase modulation with a following reflection from chirped mirrors. The contrast increases because the radiation of the pedestal is blocked by a square screen arranged in a focal plane of a unit-magnification telescope, and the main pulse ‘bypasses’ the screen, because a wedge in front of the telescope declines the pulse to a large angle due to a cubic nonlinearity.

中文翻译：

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三次非线性光楔增强飞秒激光脉冲的时间对比度和功率

提出了一种增强飞秒激光脉冲在非线性脉冲压缩下的时域对比度的方法，该方法通过自相位调制和啁啾反射镜的跟随反射引起的光谱展宽。对比度增加是因为基座的辐射被布置在单位倍率望远镜焦平面上的方形屏幕阻挡，而主脉冲“绕过”屏幕，因为望远镜前面的楔子将脉冲衰减到由于三次非线性，大角度。