论文标题
如何从相对论等离子体镜子中产生强烈的孤立脉冲脉冲？
How to generate intense isolated attosecond pulses from relativistic plasma mirrors?
论文作者
论文摘要
在相对论等离子体镜上，高功率激光器的多普勒谐波生成是产生明亮的attosent Light爆发的有前途的途径。然而，一个主要的挑战是找到一种产生孤立的Attsond脉冲的方法，更适合于定时分辨的实验，而不是脉冲火车。一种有希望的技术是Attosend Lighthouse效应，它包括在列车的连续脉冲上印记不同的传播方向，然后在远场中空间过滤一个脉冲。但是，在相对论方面，等离子体镜会因入射激光器的辐射压力而弯曲，从而将产生的谐波束聚焦。这增加了谐波束发散，使得难以将attsond脉冲分离。在本文中，我们提出了两种新颖的技术，容易适用于实验，以显着降低多普勒谐波的差异，并实现灯塔效应中孤立的Attosecond脉冲的产生，而无需几乎没有循环激光脉冲。使用最先进的模拟证明了它们的有效性，该模拟表明，在X-UV范围内，可以用PW级激光器生成隔离的Attosecond脉冲，其有效性为$ 10 $ TW峰值。这些技术同样可以应用于其他一代机制，以减轻产生孤立的Attosent脉冲所需的激光脉冲持续时间的约束。
Doppler harmonic generation of a high-power laser on a relativistic plasma mirror is a promising path to produce bright attosecond light bursts. Yet, a major challenge has been to find a way to generate isolated attosecond pulses, better suited to timed-resolved experiments, rather than trains of pulses. A promising technique is the attosecond lighthouse effect, which consists in imprinting different propagation directions to successive attosecond pulses of the train, and then spatially filtering one pulse in the far field. However, in the relativistic regime, plasma mirrors get curved by the radiation pressure of the incident laser and thus focus the generated harmonic beams. This increases the harmonic beam divergence and makes it difficult to separate the attosecond pulses angularly. In this article, we propose two novel techniques readily applicable in experiments to significantly reduce the divergence of Doppler harmonics, and achieve the generation of isolated attosecond pulses from the lighthouse effect without requiring few-cycle laser pulses. Their validity is demonstrated using state-of-the-art simulations, which show that isolated attosecond pulses with $10$TW peak power in the X-UV range can be generated with PW-class lasers. These techniques can equally be applied to other generation mechanisms to alleviate the constraints on the duration on the laser pulses needed to generate isolated attosecond pulses.
