利用贝塞尔-高斯光束的空间滤波和高通量软x射线高谐波的最佳产生

IF 11.9 1区 物理与天体物理 Q1 PHYSICS, APPLIED Applied physics reviews Pub Date : 2024-12-18 DOI:10.1063/5.0221080
Xiangyu Tang, Kan Wang, Baochang Li, Jiaxin Han, Chi Zhang, Bincheng Wang, C. D. Lin, Cheng Jin
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引用次数: 0

摘要

近年来,高重复率、高平均功率中红外激光脉冲的重大进展,使桌面高通量相干软x射线谐波的产生成为可能,用于光子饥渴实验。然而,在实际应用中,如何有效地从高次谐波中滤除驱动光束是至关重要的。在这项研究中,我们利用贝塞尔-高斯(BG)光束的独特特性,引入了一种新的空间滤波方法,专门针对软x射线谐波,同时释放高光子通量。模拟结果表明,通过精细调节聚焦几何形状和气体压力,BG光束自然地呈环形形状,在远场发散最小的情况下发出高谐波。为了实现驱动光束和谐波发射的完全空间分离,我们确定了最佳气体压力和聚焦几何形状,特别是在过度驱动激光强度下,当精确电离水平高于“临界”值时,气体介质中短轨迹电子的谐波发射实现了良好的相位匹配。此外,我们建立了保持最佳相位匹配条件的比例关系,这对于空间分离驱动激光和高谐波场至关重要,特别是当驱动激光的波长增加时。此外,我们的分析表明,与截断的高斯环形光束相比,谐波产率至少有一个数量级的显著提高。我们还表明,在可获得的实验条件下,软x射线在250 eV下的光子通量可达到1010光子/s。BG光束的利用为高通量阿秒软x射线光源的发展开辟了一条有希望的途径,有望服务于广泛的应用。
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Spatial filtering and optimal generation of high-flux soft x-ray high harmonics using a Bessel–Gauss beam
In recent years, significant advancements in high-repetition-rate, high-average-power mid-infrared laser pulses have enabled the generation of tabletop high-flux coherent soft x-ray harmonics for photon-hungry experiments. However, for practical applications, it is crucial to effectively filter out the driving beam from the high harmonics. In this study, we leverage the distinctive properties of a Bessel–Gauss (BG) beam to introduce a novel approach for spatial filtering, specifically targeting soft x-ray harmonics, releasing with a high-photon flux simultaneously. Our simulations reveal that by finely adjusting the focus geometry and gas pressure, the BG beam naturally adopts an annular shape, emitting high harmonics with minimal divergence in the far field. To achieve complete spatial separation of the driving beam and harmonic emissions, we pinpoint the optimal gas pressure and focusing geometry, particularly under overdriven laser intensities, for achieving good phase matching of harmonic emissions from short-trajectory electrons within the gas medium when the exact ionization level is higher than the “critical” value. Additionally, we establish scaling relations for sustaining optimal phase-matching conditions crucial for spatially separating the driving laser and the high-harmonic field, especially as the wavelength of the driving laser increases. Furthermore, our analysis demonstrates a substantial enhancement of harmonic yields by at least one order of magnitude compared to a truncated Gaussian annular beam. We also show that under accessible experimental conditions, soft x-ray photon flux up to 1010 photons/s at 250 eV can be achieved. The utilization of the BG beam opens up a promising pathway for the development of high-flux attosecond soft x-ray light sources, poised to serve a wide range of applications.
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来源期刊
Applied physics reviews
Applied physics reviews PHYSICS, APPLIED-
CiteScore
22.50
自引率
2.00%
发文量
113
审稿时长
2 months
期刊介绍: Applied Physics Reviews (APR) is a journal featuring articles on critical topics in experimental or theoretical research in applied physics and applications of physics to other scientific and engineering branches. The publication includes two main types of articles: Original Research: These articles report on high-quality, novel research studies that are of significant interest to the applied physics community. Reviews: Review articles in APR can either be authoritative and comprehensive assessments of established areas of applied physics or short, timely reviews of recent advances in established fields or emerging areas of applied physics.
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