Nonlinear compression of picosecond chirped pulse from thin-disk amplifier system through a gas-filled hollow-core fiber |
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| Institution: | 1. School of Physics Science and Engineering, Tongji University, Shanghai 200092, China;
2. State Key Laboratory of High Field Laser Physics, Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China;
3. University of Chinese Academy of Sciences, Beijing 100049, China;
4. Department of Physics, Shanghai University, Shanghai 200444, China |
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| Abstract: | We theoretically study the nonlinear compression of a 20-mJ, 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. |
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| Keywords: | picosecond pulse hollow-core fiber thin-disk amplifier spectrum broadening |
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