瑞典于默奥大学Laszlo Veisz团队研究了100 TW峰值功率水平下亚两周期脉冲的波形控制场合成。相关论文于2025年7月10日发表在《自然—光子学》杂志上。
脉冲持续时间为几十飞秒的超高峰值功率激光系统被广泛应用于粒子致密性和二次辐射的驱动。相反，具有较短（几飞秒）脉冲持续时间和较低峰值功率的激光器能够产生孤立的阿秒光脉冲，以无与伦比的时间分辨率研究自然。
研究组报道了一种增强的光学参量啁啾脉冲放大器系统，该系统产生峰值功率约为100 TW，脉冲持续时间短至4.3 fs具有全波形控制。相干场合成通过三个级联的放大级产生从可见光到近红外的宽带光谱，每个放大级包含两个光学参量放大器，依次增强互补光谱区域。
由此产生的光瞬态波形稳定到<300 mrad，聚焦到1021 W cm-2的强度 ，在时间对比度方面表现出突出的高动态范围。这些特性共同使该系统非常适合要求苛刻的相对论激光等离子体实验。利用时间超分辨率，脉冲的持续时间缩短到4秒以下。该平台致力于推进阿秒电子和X射线源的前沿研究。
附：英文原文
Title: Waveform-controlled field synthesis of sub-two-cycle pulses at the 100 TW peak power level
Author: Veisz, Laszlo, Fischer, Peter, Vardast, Sajjad, Schnur, Fritz, Muschet, Alexander, De Andres, Aitor, Kaniyeri, Sreehari, Li, Hang, Salh, Roushdey, Ferencz, Krpt, Nagy, Gergely Norbert, Kahaly, Subhendu
Issue&Volume: 2025-07-10
Abstract: Ultrahigh peak-power laser systems with pulse durations of tens of femtoseconds are widely used as drivers for compact sources of particles and secondary radiation. Conversely, lasers with shorter (a few femtoseconds) pulse durations and lower peak powers enable the generation of isolated attosecond light pulses to study nature with unparalleled temporal resolution. Here we report an enhanced optical parametric chirped pulse amplifier system that produces light pulses with a peak power of about 100TW and a pulse duration as short as 4.3fs with full waveform control. Coherent field synthesis generates a broadband spectrum, spanning from the visible to the near infrared, through three cascaded amplification stages, each housing two optical parametric amplifiers that sequentially boost complementary spectral regions. The resulting light transients are waveform-stabilized to <300mrad and focused to an intensity of 1021Wcm2 and exhibit an outstanding high dynamic range in temporal contrast. Together, these characteristics render the system well suited for demanding relativistic laser–plasma experiments. Utilizing temporal super-resolution, the pulses are shortened to sub-4-fs duration. This platform is dedicated to advancing the frontiers of attosecond electron and X-ray sources.
DOI: 10.1038/s41566-025-01720-2
Source: https://www.nature.com/articles/s41566-025-01720-2