Nonlinear compression of picosecond chirped pulse from thin-disk amplifier system through a gas-filled hollow-core fiber

• Published in: Chinese physics B 2016-12, Vol.25 (12), p.277-282
• Main Author: 陆俊 黄志远 王丁 许毅 刘彦祺 郭晓杨 黎文开 吴分翔 刘征征 冷雨欣
• Format: Article
• Language: English
• Subjects: 压缩; 啁啾脉冲; 放大器; 最佳光纤长度; 气体压力; 皮秒; 空心光纤; 非线性效应
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/25/12/124207

We theoretically study the nonlinear compression of a 20-rnJ, 1030-nm picosecond chirped pulse from the thin-disk amplifier in a krypton gas-filled hollow-core fiber. The chirp from the thin-disk amplifier system has little influence on the initial pulse, however, it shows an effect on the nonlinear compression in hollow-core fiber. We use a large diameter hollow waveguide to restrict undesirable nonlinear effects such as ionization; on the other hand, we employ suitable gas pressure and fiber length to promise enough spectral broadening; with 600-μm, 6-bar （1 bar = 105 Pa）, 1.8-m hollow fiber, we obtain 31.5-fs pulse. Moreover, we calculate and discuss the optimal fiber lengths and gas pressures with different initial durations induced by different grating compression angles for reaching a given bandwidth. These results are meaningful for a compression scheme from picoseconds to femtoseconds.