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Abstract <p>Using in situ laser surface probing, we study the interaction of broadband high-power radiation from a pulsed high-current discharge in background gas media (Ar and air) with the surface of a&#xa0;model dielectric mirror (ZrO<sub>2</sub>/SiO<sub>2</sub>). Sources based on pulsed high-current (<i>I</i> &gt; 100 kA) plasma dynamic discharges generate high-brightness radiation fluxes, including those in the vacuum ultraviolet (VUV) spectrum. Changing the composition of the background gas enables radiative spectrum tuning, by controlling the short-wavelength emission limit. Characteristic values of the integrated (over the entire spectrum) radiant energy flux density at a distance of 78.6 cm from the source axis under the implemented conditions range from ∼14–25 kW/cm<sup>2</sup> (discharges in air) to ∼37–112&#xa0;kW/cm<sup>2</sup> (discharges in argon). The obtained results indicate the occurrence of several gas-dynamic processes (evaporation, plasma layer formation, etc.) near the irradiated mirror, whose intensity reaches a maximum within 12–15 μs, which is confirmed by shielding the scanning laser beam. It&#xa0;is shown that the characteristic time of plasma flow emission above the surface is ∼30–40 μs.</p>

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In Situ Study of the Dynamics of Interaction of High-Power VUV Light Fluxes With the Surface of a Dielectric Mirror

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • A. S. Skriabin,
  • V. D. Telekh,
  • A. V. Pavlov,
  • D. B. Pushkin,
  • P. A. Novikov

摘要

Abstract

Using in situ laser surface probing, we study the interaction of broadband high-power radiation from a pulsed high-current discharge in background gas media (Ar and air) with the surface of a model dielectric mirror (ZrO2/SiO2). Sources based on pulsed high-current (I > 100 kA) plasma dynamic discharges generate high-brightness radiation fluxes, including those in the vacuum ultraviolet (VUV) spectrum. Changing the composition of the background gas enables radiative spectrum tuning, by controlling the short-wavelength emission limit. Characteristic values of the integrated (over the entire spectrum) radiant energy flux density at a distance of 78.6 cm from the source axis under the implemented conditions range from ∼14–25 kW/cm2 (discharges in air) to ∼37–112 kW/cm2 (discharges in argon). The obtained results indicate the occurrence of several gas-dynamic processes (evaporation, plasma layer formation, etc.) near the irradiated mirror, whose intensity reaches a maximum within 12–15 μs, which is confirmed by shielding the scanning laser beam. It is shown that the characteristic time of plasma flow emission above the surface is ∼30–40 μs.