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Nonlinearity- and Dispersion-Controlled High-Energy All-Fiber Femtosecond Laser System with Peak Power Exceeding 0.5
Feng Li1, Qianglong Li1, Jixin Xing1
1State Key Laboratory of Ultrafast Optical Science and Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi'an 710119, China.
Nanomaterials (Basel, Switzerland)
|January 9, 2026
Summary
This study demonstrates a monolithic all-fiber chirped pulse amplification (CPA) system achieving record high pulse energy. The novel fiber femtosecond amplifier system offers high energy output with excellent beam quality.
Area of Science:
- Laser physics
- Fiber optics
- Nonlinear optics
Background:
- Chirped pulse amplification (CPA) systems are crucial for generating high-energy ultrashort laser pulses.
- Nonlinearity in fiber amplifiers poses challenges for achieving high pulse energies and maintaining pulse quality.
- Monolithic all-fiber systems offer advantages in terms of stability and compactness.
Purpose of the Study:
- To develop a monolithic all-fiber high-energy chirped pulse amplification system.
- To overcome nonlinearity issues in fiber amplifiers for high-energy pulse generation.
- To achieve record pulse energy in a fiber-based femtosecond amplifier.
Main Methods:
- Utilized temperature-tuning cascaded chirped fiber Bragg gratings (CFBGs) for pulse stretching to over 2 ns.
- Employed a centimeter-level, large mode area, high-gain silicate glass fiber amplifier.
- Implemented a reflective grating pair (1740 lines/mm) for pulse compression.
- Applied high-order dispersion pre-compensation using CFBGs.
Main Results:
- Achieved a maximum pulse energy of 293 μJ from the amplifier at 100 kHz repetition rate.
- Generated compressed pulses with a duration of 466 fs and energy of 250 μJ.
- Obtained a compression efficiency exceeding 85%.
- Preserved excellent beam quality with M² < 1.3.
Conclusions:
- Demonstrated the highest pulse energy reported to date for a monolithic fiber femtosecond amplifier.
- The developed CPA system shows significant potential for applications requiring high-energy ultrashort pulses.
- The combination of CFBGs and optimized fiber amplification enables efficient high-energy pulse generation.
