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针对光参量啁啾脉冲放大系统中的色散特性,提出了一种基于双密度棱栅的新型超短脉冲色散补偿装置。该色散补偿装置包括一对互相平行的光栅和一对斜边平行放置的同等大小的等腰直角棱镜,第二个光栅的线密度是第一个的两倍。建立光线追迹模型,通过数值计算,讨论了装置各结构参数对装置色散补偿量的影响。结果表明,该装置可以在补偿系统剩余线性啁啾(二阶色散)量的基础上,独立补偿三阶色散,且补偿量可在较大正负范围内变化,适用于飞秒量级超短啁啾脉冲系统的色散控制。
Aiming at the chromatic dispersion characteristics of optical parametric chirped pulse amplification system, a new type of ultrashort pulse dispersion compensation device based on double density pyramid is proposed. The dispersion compensation device comprises a pair of parallel gratings and a pair of isosceles right-angle prisms of equal size arranged parallel to each other, the second grating having a linear density twice that of the first one. The model of ray tracing is established. The influence of various structural parameters of the device on the dispersion compensation of the device is discussed through numerical calculation. The results show that this device can independently compensate the third-order dispersion on the basis of compensating for the remaining linear chirp (second-order dispersion) of the system, and the compensation amount can vary within a larger positive and negative range, which is suitable for ultra-short femtosecond order Chromatic dispersion control of chirped pulse system.