Journal
CHINESE OPTICS LETTERS
Volume 19, Issue 9, Pages -Publisher
OSA-OPTICAL SOC
DOI: 10.3788/COL202119.091401
Keywords
nonlinear chirped-pulse amplification; spectral shaping; fiber amplifier
Categories
Funding
- National Natural Science Foundation of China [12034020, 11674386, 11974416]
- National Key R&D Program of China [2018YFB1107201]
- Synergic Extreme Condition User Facility
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The high power fiber amplifier based on nonlinear chirped-pulse amplification (NCPA) successfully manages nonlinearity through pulse shaping and compensation methods, resulting in stable output power and good beam quality.
We report a high power fiber amplifier based on nonlinear chirped-pulse amplification (NCPA). To manage the nonlinearity, pulse shaping is introduced by self-phase modulation in the fiber stretcher with the help of spectral filtering. The third-order dispersion is compensated for by the nonlinear phase shift in the NCPA. With optimization, the system can output 382 fs pulse duration with 20 W average power at 1 MHz repetition rate. The long-term average power fluctuation is measured to be 0.5% in 24 h, and the beam quality factor (M-2) is 1.25.
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