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Compact intense extreme-ultraviolet source
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DOI：10.1364/OPTICA.421564.png)
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Abstract
En 中文
High-intensity laser pulses covering the ultraviolet to terahertz spectral regions are nowadays routinely generated in a large number of laboratories. In contrast, intense extreme-ultraviolet (XUV) pulses have only been demonstrated using a small number of sources including free-electron laser facilities and long high-harmonic generation (HHG) beamlines. Here, we demonstrate a concept for a compact intense XUV source based on HHG that is focused to an intensity of 2 x 10(14) W/cm(2), with a potential increase up to 10(17) W/cm(2) in the future. Our approach uses tight focusing of the near-infrared (NIR) driving laser and minimizes the XUV virtual source size by generating harmonics several Rayleigh lengths away from the NIR focus. Accordingly, the XUV pulses can be refocused to a small beam waist radius of 600 nm, enabling the absorption of up to four XUV photons by a single Ar atom in a setup that fits on a modest (2 m) laser table. Our concept represents a straightforward approach for the generation of intense XUV pulses in many laboratories, providing exciting opportunities for XUV strong-field and nonlinear optics experiments, for XUV-pump XUV-probe spectroscopy and for the coherent diffractive imaging of nanoscale structures. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Keywords:
FREE-ELECTRON LASER
NONLINEAR OPTICS
GENERATION
COHERENT
RADIATION
LIGHT
Journal
IF:
8.5
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2.4K
Citations:
2.1W
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