We theoretically investigate the generation of higher harmonics and the construction of a single attosecond pulse (ASP) by means of two oppositely polarized sinc-shaped driver pulses. In comparison to a few-cycle Gaussian pulse of the same energy, here we observe a significant broadening in the bandwidth of the XUV/soft x-ray supercontinuum spectrum in the synthesized pulse. Furthermore, we observe that the harmonic cutoff and its corresponding intensity follow a well-defined scaling with the delay parameter between the two pulses. In principle, this delay can easily be tuned on an optical bench. The typical nature of the synthesized pulse ensures the generation of a single ASP instead of a pulse train. In this case, we obtain a single ASP with a duration of ∼27 attoseconds in the XUV/soft x-ray regime of the electromagnetic spectrum. Depending on the delay parameter we observe an enhancement in some satellite harmonics. The proposed setup promises a highly tunable source...

中文翻译：

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通过正弦脉冲调节高次谐波截止

从理论上讲，我们通过两个相反极化的Sinc形驱动器脉冲来研究高次谐波的产生和单个阿秒脉冲（ASP）的构造。与相同能量的几个周期的高斯脉冲相比，这里我们观察到合成脉冲中XUV /软X射线超连续谱的带宽显着扩大。此外，我们观察到谐波截止及其对应的强度遵循两个脉冲之间的延迟参数的明确定义的缩放比例。原则上，可以在光具座上轻松调整此延迟。合成脉冲的典型性质可确保生成单个ASP而不是脉冲序列。在这种情况下，我们在电磁波谱的XUV /软X射线状态下获得了一个持续时间约为27阿秒的ASP。根据延迟参数，我们观察到某些卫星谐波的增强。提议的设置有望提供高度可调谐的信号源。