Characterizing post-compression of mJ-level ultrafast pulses via loose focusing in a gas cell.

IF 3.2 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2024-11-04 DOI:10.1364/OE.539655
Fengling Zhang, Antonios Pelekanidis, Augustas Karpavicius, Matthias Gouder, Jacob Seifert, Kjeld Eikema, Stefan Witte
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引用次数: 0

Abstract

The ability to generate high-intensity ultrashort laser pulses is a key driver for advancing the strong-field physics and its applications. Post-compression methods aim to increase the peak intensity of amplified laser pulses via spectral broadening through self-phase modulation (SPM), followed by temporal pulse compression. However, other unavoidable nonlinear self-action effects, which typically occur parallel to SPM, can lead to phase distortions and beam quality degradation. Here we study the ability to compress high-energy pulses by loose focusing in a noble gas to induce nonlinear spectral broadening, while limiting unwanted nonlinear effects such as self-focusing. We introduce ptychographic wavefront sensor and FROG measurements to identify the regimes that optimize pulse compression while maintaining high beam quality. Using a 700 mbar argon-filled double-pass-based scheme, we successfully compress 2 mJ, 170 fs, 1030 nm laser pulses to ∼35 fs, achieving 90% overall flux efficiency and excellent stability. This work provides guidelines for optimizing the compressed pulse quality and further energy scaling of double-pass-based post-compression concepts.

通过气室中的松散聚焦,描述毫焦耳级超快脉冲的后压缩特性。
产生高强度超短激光脉冲的能力是推动强场物理学及其应用的关键因素。后压缩方法旨在通过自相位调制(SPM)的光谱展宽来提高放大激光脉冲的峰值强度,然后再进行时间脉冲压缩。然而,与 SPM 同时发生的其他不可避免的非线性自作用效应会导致相位失真和光束质量下降。在此,我们研究了在惰性气体中通过松散聚焦压缩高能脉冲的能力,以诱导非线性光谱展宽,同时限制不必要的非线性效应,如自聚焦。我们引入了双曲面波前传感器和 FROG 测量方法,以确定在保持高光束质量的同时优化脉冲压缩的状态。利用基于 700 毫巴氩气填充的双通道方案,我们成功地将 2 mJ、170 fs、1030 nm 激光脉冲压缩至 ∼35 fs,实现了 90% 的总体流量效率和出色的稳定性。这项工作为优化压缩脉冲质量和基于双通道的后压缩概念的进一步能量扩展提供了指导。
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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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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