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首页> 美国卫生研究院文献>Scientific Reports >Optimal generation of spatially coherent soft X-ray isolated attosecond pulses in a gas-filled waveguide using two-color synthesized laser pulses
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Optimal generation of spatially coherent soft X-ray isolated attosecond pulses in a gas-filled waveguide using two-color synthesized laser pulses

机译：使用双色合成激光脉冲在充气波导中最佳生成空间相干软X射线隔离的阿秒脉冲

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摘要

We numerically demonstrate the generation of intense, low-divergence soft X-ray isolated attosecond pulses in a gas-filled hollow waveguide using synthesized few-cycle two-color laser waveforms. The waveform is a superposition of a fundamental and its second harmonic optimized such that highest harmonic yields are emitted from each atom. We then optimize the gas pressure and the length and radius of the waveguide such that bright coherent high-order harmonics with angular divergence smaller than 1 mrad are generated, for photon energy from the extreme ultraviolet to soft X-rays. By selecting a proper spectral range enhanced isolated attosecond pulses are generated. We study how dynamic phase matching caused by the interplay among waveguide mode, neutral atomic dispersion, and plasma effect is achieved at the optimal macroscopic conditions, by performing time-frequency analysis and by analyzing the evolution of the driving laser’s electric field during the propagation. Our results, when combined with the on-going push of high-repetition-rate lasers (sub- to few MHz’s) may eventually lead to the generation of high-flux, low-divergence soft X-ray tabletop isolated attosecond pulses for applications.
机译：我们使用合成的少周期双色激光波形在数值上证明了在充气的空心波导中产生强，低发散的软X射线孤立的阿秒脉冲。该波形是基波的叠加，并且优化了其二次谐波，以使每个原子发出最高的谐波产量。然后，我们优化气体压力以及波导的长度和半径，以便产生从发散的紫外到柔和X射线的光子能量，其明亮的相干高次谐波的角散度小于1μmrad。通过选择适当的光谱范围，可以产生增强的隔离阿秒脉冲。我们通过进行时频分析并分析传播过程中驱动激光器电场的演变，研究了在最佳宏观条件下如何实现由波导模式，中性原子扩散和等离子体效应之间的相互作用引起的动态相位匹配。我们的结果，再加上持续不断地推动高重复频率激光器（低于几兆赫兹）的应用，最终可能会导致产生高通量，低发散的软X射线台式孤立的阿秒脉冲供应用。

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