中国激光, 2020, 47 (1): 0101006, 网络出版: 2020-01-09
基于光谱控制与色散优化的飞秒啁啾脉冲放大系统 下载: 1606次
Femtosecond Chirped-Pulse Amplifier System Based on Spectrum Control and Dispersion Optimization
激光器 光纤激光器 啁啾光纤布拉格光栅 飞秒激光 啁啾脉冲放大 lasers fiber lasers chirped fiber Bragg grating femtosecond laser chirped pulse amplification
摘要
飞秒激光在工业加工、精密测量、****、科学研究等领域具有广阔的应用前景。报道了基于光谱控制与色散优化的高功率、高脉冲质量飞秒啁啾脉冲放大系统。利用与压缩器色散量相匹配的色散可调啁啾布拉格光纤光栅(CFBG)作为展宽器,通过微调CFBG色散量补偿系统的残余色散使整个系统的净色散趋于零;同时引入光谱滤波等手段,保证入射到主放大器之前的脉冲光谱形状不发生畸变,避免了放大过程中脉冲质量的劣化。最终获得了重复频率为50 MHz、平均功率为24 W、脉冲宽度为198 fs的高脉冲质量飞秒激光输出。
Abstract
Femtosecond laser has many potential applications in various fields, such as industrial processing, precision measurement, defense, and scientific research. A high-power and high-pulse-quality femtosecond chirped-pulse amplifier system based on spectrum control and dispersion optimization is reported. In the proposed system, the chirped fiber Bragg grating (CFBG) with tunable dispersion is designed to match the compressor and can be fine-tuned. Thus, the net dispersion of the system approaches zero by controlling the residual dispersion of CFBG dispersion compensation system. Furthermore, the degradation of the pulse quality in the amplification processing is avoided by controlling the spectral shape via spectral filtering before the main amplifier to prevent distortion. Finally, high-quality femtosecond laser pulses as short as 198 fs with an average power of 24 W at a repetition rate of 50 MHz are generated.
牛佳, 刘博文, 宋寰宇, 赵思聪, 李少北, 王铁男, 顾新华, 柴路, 胡明列. 基于光谱控制与色散优化的飞秒啁啾脉冲放大系统[J]. 中国激光, 2020, 47(1): 0101006. Jia Niu, Bowen Liu, Huanyu Song, Sicong Zhao, Shaobei Li, Tienan Wang, Xinhua Gu, Lu Chai, Minglie Hu. Femtosecond Chirped-Pulse Amplifier System Based on Spectrum Control and Dispersion Optimization[J]. Chinese Journal of Lasers, 2020, 47(1): 0101006.