通过同向旋转双圆激光场调控阿秒脉冲的偏振态
Tailoring polarisation of attosecond pulses via co-rotating bicircular laser fields
AI总结：
本研究提出利用同向旋转ω-2ω双圆激光场的高次谐波产生，生成偏振特性鲁棒、椭圆率可调的阿秒脉冲，为研究手征敏感的光-物质超快过程提供了新方法。
摘要：
本研究提出了一种可靠的方法，利用同向旋转ω-2ω双圆激光场的高次谐波产生，生成椭圆率可调的阿秒脉冲。该激光场的总电场不具备旋转对称性，因此能在较宽的光谱带宽范围内产生具有相同螺旋性的高次谐波。相同螺旋性的高次谐波为合成椭圆率可调的阿秒脉冲提供了可能。所产生谐波的偏振特性对驱动场参数（如波长、强度比以及ω与2ω场之间的亚周期相位）的变化具有鲁棒性。本工作为在物质本征时间尺度上研究手征敏感的光-物质超快过程开辟了新途径。
英文摘要：
The present work introduces a robust way to generate attosecond pulses with tunable ellipticity via high-order harmonic generation by co-rotating $ω- 2ω$ bicircular laser fields. The total electric field of the laser fields exhibits an absence of rotational symmetry, which leads to the generation of high harmonics of the same helicity across a broad range of spectral bandwidth. High-harmonics with the same helicity offer the opportunity to synthesize attosecond pulses with tunable ellipticity. The polarisation properties of the generated harmonics are robust against the variations in driving fields' parameters, such as wavelength, intensity ratio, and the sub-cycle phase between $ω-2ω$ fields. Our work opens an avenue to study chiral-sensitive light-matter ultrafast processes on their intrinsic timescale.
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