Investigating the influence of ionization on high-harmonic generation in Ar–Ne and Ar–Kr gas mixtures driven by kHz laser pulses

IF 1.5 4区物理与天体物理 Q3 OPTICS

The European Physical Journal D Pub Date : 2024-10-19 DOI:10.1140/epjd/s10053-024-00924-5

S. Chintalwad, B. Ramakrishna, Lap Van Dao

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Abstract

We conducted a study on high-harmonic generation (HHG) in mixed gases, specifically Ar–Ne or Ar–Kr, with the aim of investigating the impact of ionization rate and neutral dispersion on the HHG process. Our focus was on understanding how these factors influence the HHG process when using gases with low and high ionization potentials. Based on phase-matched high-order harmonic generation in pure Ar gas, our investigation shows that the influence of plasma dispersion and neutral dispersion can be varied independently in mixed gas while the laser intensity is kept constant. Our results reveal that the addition of low ionization potential gases, such as Kr, to the Ar gas leads to a more rapid reduction in phase matching, due to the strong effects of ionization. The observed experimental outcomes align well with our theoretical calculations. This study provides valuable insights into the interplay of ionization rate and neutral dispersion in high-harmonic generation and the special requirement of the controlling of laser intensity for phase-matched harmonic generation. The findings contribute to a deeper understanding of the underlying dynamics and offer practical considerations for optimizing HHG properties.

Graphical abstract

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研究电离对千赫激光脉冲驱动的 Ar-Ne 和 Ar-Kr 气体混合物中高次谐波产生的影响

我们对混合气体（特别是 Ar-Ne 或 Ar-Kr）中的高频发生（HHG）进行了研究，目的是调查电离率和中性弥散对 HHG 过程的影响。我们的重点是了解在使用低电离势和高电离势气体时，这些因素如何影响 HHG 过程。基于纯氩气中的相位匹配高阶谐波生成，我们的研究表明，在混合气体中，等离子体弥散和中性弥散的影响可以独立变化，而激光强度保持不变。我们的研究结果表明，在氩气中加入低电离势气体（如 Kr）会导致相匹配度更快地降低，这是由于电离的强烈影响。观察到的实验结果与我们的理论计算结果非常吻合。这项研究为了解高次谐波产生过程中电离率和中性色散的相互作用，以及控制激光强度以产生相位匹配谐波的特殊要求提供了宝贵的见解。这些发现有助于加深对基本动力学的理解，并为优化高次谐波发生特性提供了实用的考虑因素。

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

The European Physical Journal D 物理-物理：原子、分子和化学物理

CiteScore

3.10

自引率

11.10%

发文量

213

审稿时长

3 months

期刊介绍： The European Physical Journal D (EPJ D) presents new and original research results in: Atomic Physics; Molecular Physics and Chemical Physics; Atomic and Molecular Collisions; Clusters and Nanostructures; Plasma Physics; Laser Cooling and Quantum Gas; Nonlinear Dynamics; Optical Physics; Quantum Optics and Quantum Information; Ultraintense and Ultrashort Laser Fields. The range of topics covered in these areas is extensive, from Molecular Interaction and Reactivity to Spectroscopy and Thermodynamics of Clusters, from Atomic Optics to Bose-Einstein Condensation to Femtochemistry.