用反射式达曼光栅产生飞秒激光双脉冲

采用反射式达曼光栅建立了一种产生飞秒激光双脉冲的新装置．由于采用反射式结构，避免了材料色散和吸收导致的脉冲畸变，并构建了一台二次谐波一频率分辨光学开关装置对产生的双脉冲进行了测量．实验结果表明可以实现脉冲强度相等、时间宽度相同、不同间隔的双脉冲输出．产生双脉冲的装置在飞秒激光领域有着应用的价值．

A novel device for generating femtosecond double pulses is constructed, which mainly consists of three Dammann reflection gratings. Being free from transmission elements, pulse distortion is avoided. Measuring the generated double pulses with a homemade second-harmonic generation frequency-resolved optical gating, experimental results demonstrated that this device can generate double pulses exactly equal in pulse intensity and pulse width with arbitrary delay time. This method should be highly interesting for double pulses generation and its practical applications.