论文标题
通过高阶频率混合产生具有可控载体 - Envelope阶段的Attsond脉冲
Generation of Attosecond Pulses with Controllable Carrier-Envelope Phase via High-order Frequency Mixing
论文作者
论文摘要
对于不断扩展的应用领域而言，亮度和脉搏持续时间中的桌面顶端源具有极大的兴趣和重要性。最近的理论研究[New J. Phys。，22 093030（2020）]发现，两色激光场中的高阶频率混合（HFM）可能比高阶谐波生成（HHG）更有效。在这里，我们研究了通过HFM分析和数值生成的相干XUV的Attosent属性，重点是实际上重要的情况，当其中一个领域的频率较低，强度低得多，而强度低得多。我们得出简单的分析方程，描述了HFM光谱成分的强度和相位锁定。我们表明，通过HFM产生的Attsond脉冲的持续时间，虽然与高原通过HHG获得的脉冲非常相似，但在截止区域缩短了。此外，我们的研究表明，与HHG相比，通过HHG产生的Attopulses的载体 - Envelope相很容易由生成场的阶段来控制。
Advancing table-top attosecond sources in brightness and pulse duration is of immense interest and importance for an expanding sphere of applications. Recent theoretical studies [New J. Phys., 22 093030 (2020)] have found that high-order frequency mixing (HFM) in a two-color laser field can be much more efficient than high-order harmonic generation (HHG). Here we study the attosecond properties of the coherent XUV generated via HFM analytically and numerically, focusing on the practically important case when one of the fields has much lower frequency and much lower intensity than the other one. We derive simple analytical equations describing intensities and phase locking of the HFM spectral components. We show that the duration of attosecond pulses generated via HFM, while being very similar to that obtained via HHG in the plateau, is shortened for the cut-off region. Moreover, our study demonstrates that the carrier-envelope phase of the attopulses produced via HFM, in contrast to HHG, can be easily controlled by the phases of the generating fields.
