高强度Laser脉冲时间反馈控制优化原子团簇超快加热
Temporal Feedback Control of High-Intensity Laser Pulses to Optimize Ultrafast Heating of Atomic Clusters
摘要：
我们描述了如何在有限的重复频率（5 Hz）的主动反馈例程可以应用于优化高功率$>10$ TW）激光与团簇气体的相互作用。使用遗传算法优化氩团簇射流的X射线产生，通过对150 mJ驱动激光脉冲的时间修改，使测量能量大约增加了一倍。这种方法通过探索多维参数空间实现了增加的辐射产额，而不需要复杂的簇动力学的详细先验知识。优化的激光脉冲表现出一个缓慢的上升沿的强度分布，这增强了激光能量耦合到集群介质中，相比，最佳压缩的半高宽脉冲（40 fs）。我们的工作表明，这种技术可以更广泛地用于控制拍瓦级激光系统的强脉冲二次辐射。
英文摘要：
We describe how active feedback routines can be applied at limited repetition rate (5 Hz) to optimize high-power $>10$ TW) laser interactions with clustered gases. Optimization of x-ray production from an argon cluster jet, using a genetic algorithm, approximately doubled the measured energy through temporal modification of the 150 mJ driving laser pulse. This approach achieved an increased radiation yield through exploration of a multi-dimensional parameter space, without requiring detailed a priori knowledge of the complex cluster dynamics. The optimized laser pulses exhibited a slow rising edge to the intensity profile, which enhanced the laser energy coupling into the cluster medium, compared to the optimally compressed FWHM pulse (40 fs). Our work suggests that this technique can be more widely utilized for control of intense pulsed secondary radiation from petawatt-class laser systems.
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