Hundred-watt-level high-power femtosecond fiber laser
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摘要: 基于啁啾脉冲放大技术，采用棒状光子晶体光纤作为核心增益介质，成功搭建一套百瓦级的高功率飞秒光纤激光系统。在主放大器部分，通过反向泵浦与单棒双通结合的放大形式，实现泵浦功率-放大后信号光功率的转换效率超过60%，实现了高的转换效率。放大过程中有效避免了横向模式不稳定和非线性光谱畸变，输出光斑椭圆度为95%。采用双光栅结构对输出激光进行脉宽压缩，最终实现了中心波长
1033 nm、重复频率1 MHz、单脉冲能量162 μJ、脉冲宽度233 fs的高功率激光输出，激光器系统的总泵浦光功率与压缩后信号光功率转换效率高达54%。该激光器的高重复频率、高平均功率和窄脉宽特性，为百瓦级高功率飞秒光纤激光器的设计提供了新的方案。Abstract:Background High-power femtosecond fiber lasers are essential tools for advanced applications in ultrafast science, precision manufacturing, and nonlinear optics. However, achieving hundred-watt-level output while maintaining high beam quality and short pulse duration remains challenging due to nonlinear effects and transverse mode instabilities.Purpose This work aims to develop a high-power femtosecond fiber laser system based on chirped-pulse amplification (CPA), using rod-type photonic crystal fiber as the gain medium, to achieve hundred-watt-level output with high efficiency and stable beam quality.Methods The system adopts a rod-type photonic crystal fiber as the main amplifier. Backward pumping combined with double-pass amplification in a single rod fiber is implemented to enhance pump-to-signal conversion efficiency. Nonlinear effects are mitigated by employing a large mode area fiber, short gain length, and proper chirped-pulse management. A double-grating compressor is used for final pulse compression.Results The amplifier achieves a pump-to-signal conversion efficiency exceeding 60%. The system delivers pulses with a central wavelength of1033 nm, a repetition rate of 1 MHz, a single-pulse energy of 162 μJ, and a pulse duration of 233 fs. The output beam ellipticity is better than 95%. The overall pump-to-compressed-signal efficiency reaches 54%.Conclusions The demonstrated system achieves high repetition rate, high average power, and ultrashort pulse duration simultaneously, providing a novel and practical scheme for hundred-watt-level femtosecond fiber lasers. This approach offers new opportunities for applications requiring stable, high-brightness ultrafast sources. -
图 1 基于棒状光纤的CPA 系统示意图
Figure 1. Schematic setup of the CPA system based on a rod-type fiber
图 2 Aero GAIN-ROD 3.1 棒状光子晶体光纤实物图
Figure 2. Physical photograph of Aero GAIN-ROD 3.1 rod-type photonic crystal fiber
图 4 不同泵浦功率下对应的双通放大输出功率
Figure 4. Measured double-pass amplified output power at different pump powers
图 6 压缩后脉冲在功率162 W时的自相关曲线
Figure 6. Measured autocorrelation traces of compressed pulses at maximum output power of 162 W
图 7 压缩后的脉冲在输出功率162 W时的光斑
Figure 7. The beam spot of the compressed pulse at an output power of 162 W
图 8 激光器在162 W输出功率下的8小时功率稳定性测试
Figure 8. Eight-hour output power stability measured at 162 W
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