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在啁啾脉冲放大(CPA)系统中,脉冲的展宽是实现安全有效放大的重要保证.本文介绍了一种新型的由色散棱镜与光栅组合而成的反射式棱栅对展宽器.并利用光线追迹法对色散进行了数值模拟,测量实验结果验证了理论计算的正确性.在此基础上,分析了以棱栅对为展宽器和ZF7玻璃材料为压缩器的下啁啾(down-chirped)脉冲放大系统中的色散比较传统的上啁啾脉冲放大系统,结果表明棱栅对可以同时提供负的二阶色散和三阶色散,这样能更好地补偿放大器中材料的高阶色散,从而获得近傅里叶变换极限的压缩脉冲.此外以块材料作为压缩器不仅提高了传输效率,而且简化了实验装置,增强了系统的稳定性.这样的展宽压缩组合在高重复频率的飞秒啁啾脉冲放大系统中具有明显优势.
In the chirped pulse amplification (CPA) system, the pulse broadening is an important guarantee to achieve safe and effective amplification.This paper introduces a new type of diffuse prism and grating combination of the reflection of the prism and stretcher, and the use of light The chase method is used to simulate the chromatic dispersion, and the experimental results verify the correctness of theoretical calculation.On the basis of this, the down-chirped (chirped) ) Dispersion in a Pulsed Amplification System Compared with the conventional upper chirped pulse amplification system, the results show that the ridge-pair can provide both negative second-order dispersion and third-order dispersion, thus better compensating the high-order dispersion of the material in the amplifier Get near the Fourier transform limit of the compression pulse.In addition to block material as a compressor not only improves the transmission efficiency, but also simplifies the experimental device and enhance the stability of the system.This widening compression combination in high repetition rate femtosecond chirp Chirped pulse amplification system has obvious advantages.