Prawiharjo Jerry, Daga Nikita K, Geng Rui, Price Jonathan H, Hanna David C, Richardson David J, Shepherd David P
Optoelectronics Research Centre, University of Southampton, Southampton, UK.
Opt Express. 2008 Sep 15;16(19):15074-89. doi: 10.1364/oe.16.015074.
The generation of high-fidelity femtosecond pulses is experimentally demonstrated in a fiber based chirped-pulse amplification (CPA) system through an adaptive amplitude and phase pre-shaping technique. A pulse shaper, based on a dual-layer liquid crystal spatial light modulator (LC-SLM), was implemented in the fiber CPA system for amplitude and phase shaping prior to amplification. The LC-SLM was controlled using a differential evolution algorithm, to maximize a two-photon absorption detector signal from the compressed fiber CPA output pulses. It is shown that this approach compensates for both accumulated phase from material dispersion and nonlinear phase modulation. A train of pulses was produced with an average power of 12.6W at a 50MHz repetition rate from our fiber CPA system, which were compressible to high fidelity pulses with a duration of 170 fs.
通过自适应幅度和相位预整形技术，在基于光纤的啁啾脉冲放大（CPA）系统中通过实验证明了高保真飞秒脉冲的产生。在光纤CPA系统中采用了基于双层液晶空间光调制器（LC-SLM）的脉冲整形器，用于在放大之前进行幅度和相位整形。使用差分进化算法控制LC-SLM，以使来自压缩后的光纤CPA输出脉冲的双光子吸收探测器信号最大化。结果表明，该方法可补偿材料色散累积相位和非线性相位调制。我们的光纤CPA系统以50MHz的重复频率产生了平均功率为12.6W的脉冲序列，这些脉冲可压缩为持续时间为170 fs的高保真脉冲。
