CAJ | 학술논문

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.
재조추맥충방대(CPA)계통중,맥충적전관시실현안전유효방대적중요보증.본문개소료일충신형적유색산릉경여광책조합이성적반사식릉책대전관기.병이용광선추적법대색산진행료수치모의,측량실험결과험증료이론계산적정학성.재차기출상,분석료이릉책대위전관기화ZF7파리재료위압축기적하조추(down-chirped)맥충방대계통중적색산비교전통적상조추맥충방대계통,결과표명릉책대가이동시제공부적이계색산화삼계색산,저양능경호지보상방대기중재료적고계색산,종이획득근부리협변환겁한적압축맥충.차외이괴재료작위압축기불부제고료전수효솔,이차간화료실험장치,증강료계통적은정성.저양적전관압축조합재고중복빈솔적비초조추맥충방대계통중구유명현우세.
A new reflective grism, which combines together the grating and prism, is introduced in this paper. The numerical simulation, based on the ray tracing, shows that the grism pair can introduce minus GVD and GDD;therefore it can well compensate for the material dispersions in the chirped pulse amplifier (CPA). Compared to the conventional CPA with up-chirp, the new scheme with down-chirp can support a near Fourier Transform-limited compressed pulse due to much better compensation for high-order dispersion of materials in amplifier, in which the grism acts as the stretcher and the ZF7 bulk material as the compressor. In addition, the improved transmission efficiency and simplified configuration makes it a promising way to amplify femtosecond laser pulses to sub-mJ at a high repetition rate.