Techniques to generate intense isolated attosecond pulses from relativistic plasma mirrors

H. Kallala, F. Qu'er'e, H. Vincenti
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引用次数: 3

Abstract

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.
从相对论性等离子体反射镜产生强孤立阿秒脉冲的技术
高功率激光在相对论性等离子体反射镜上产生多普勒谐波是一种产生明亮阿秒光爆发的有前途的途径。然而,一个主要的挑战是找到一种方法来产生孤立的阿秒脉冲,更适合于时间分辨实验,而不是脉冲序列。阿秒灯塔效应是一种很有前途的技术,它是将不同的传播方向印在连续的阿秒脉冲上,然后在远场对一个脉冲进行空间滤波。然而,在相对论状态下,等离子体反射镜由于入射激光的辐射压力而弯曲,从而聚焦产生的谐波光束。这增加了谐波光束的发散,使阿秒脉冲的角分离变得困难。在本文中,我们提出了两种易于应用于实验的新技术,以显着降低多普勒谐波的发散,并在不需要少周期激光脉冲的情况下,从灯塔效应产生孤立的阿秒脉冲。通过最先进的仿真证明了它们的有效性,结果表明,在X-UV范围内,pw级激光器可以产生峰值功率为10$TW的孤立阿秒脉冲。这些技术同样可以应用于其他产生机制,以减轻对产生孤立阿秒脉冲所需的激光脉冲持续时间的限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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