近日，捷克ELI束线设施的O. Finke&J. Vábek及其研究团队取得一项新进展。经过不懈努力，他们成功在周期调制介质中通过贝塞尔-高斯光束产生单色高次谐波。相关研究成果已于2024年3月18日在国际知名学术期刊《物理评论A》上发表。

该研究团队提出了一种利用贝塞尔-高斯驱动光束和周期性调制的气体介质，产生单一高次谐波频率辐射的方法。通过分析计算和数值模拟对其进行了验证。这一方法提供了一种直接从光源产生单色谐波辐射的方法，而不需要额外的单色光学器件。因此，对于许多需要单色短波辐射的应用，它代表了通量的实质性增强和设置的简化。

据悉，高次谐波产生(HHG)已成为一种多用途的相干XUV辐射源，应用于各种领域。HHG的一个显著特点是它的宽频谱由许多谐波阶组成。对于需要单一波长的应用，这可能是HHG能够实用的瓶颈。

附：英文原文

Title: Monochromatic high-order harmonic generation by a Bessel-Gauss beam in periodically modulated media

Author: O. Finke, J. Vábek, M. Dvoáek, L. Jurkoviová, M. Albrecht, H. Ovcharenko, O. Hort, J. Nejdl

Issue&Volume: 2024/03/18

Abstract: High-harmonic generation (HHG) has become a multipurpose source of coherent XUV radiation used in various applications. One of the notable aspects of HHG is its wide spectrum consisting of many harmonic orders. This might represent a bottleneck in HHG utility for applications requiring a single wavelength. We propose a method to generate radiation consisting of a single high-order harmonic frequency employing a Bessel-Gauss driving beam and a periodically modulated gaseous medium. We validate it by analytical calculations and numerical simulations. Our method provides a way to generate monochromatic harmonic radiation directly from the source without the need for additional monochromatizing optics. Thus it represents a substantial enhancement of the flux and simplification of the setup for numerous applications requiring monochromatic short-wavelength radiation.

DOI: 10.1103/PhysRevA.109.033517

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.033517