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Extreme ultraviolet interferometry of warm dense matter in laser plasmas

机译:激光等离子体中热致密物质的极紫外干涉法

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We demonstrate that interferometric probing with extreme ultraviolet (EUV) laser light enables determination of the degree of ionization of the "warm dense matter" produced between the critical and ablation surfaces of laser plasmas. Interferometry has been utilized to measure both transmission and phase information for an EUV laser beam at the photon energy of 58.5 eV, probing longitudinally through laser-irradiated plastic (parylene-N) targets (thickness 350 nm) irradiated by a 300 ps duration pulse of wavelength 438 nm and peak irradiance 10~(12) W cm~(-2). The transmission of the EUV probe beam provides a measure of the rate of target ablation, as ablated plasma becomes close to transparent when the photon energy is less than the ionization energy of the predominant ion species. We show that refractive indices eta below the solid parylene N ((eta)_(solid) velence 0.946) and expected plasma values are produced in the warm dense plasma created by laser irradiation due to bound-free absorption in C~(+).
机译:我们证明了用极紫外(EUV)激光进行干涉探测能够确定激光等离子体的临界表面与烧蚀表面之间产生的“温暖致密物质”的电离程度。干涉测量法已被用于测量58.5 eV光子能量下的EUV激光束的透射信息和相位信息,并通过300 ps持续时间脉冲的激光辐照塑料(聚对二甲苯-N)靶(厚度为350 nm)进行纵向探测。波长438 nm和峰值辐照度10〜(12)W cm〜(-2)。由于当光子能量小于主要离子物种的电离能时,被烧蚀的等离子体变得接近透明,因此EUV探测光束的透射提供了目标烧蚀速率的度量。我们显示,由于C〜(+)中的无束缚吸收,在由激光辐照产生的热致密等离子体中,低于固态聚对二甲苯N的折射率eta(η_(solid)velence 0.946)和预期的等离子体值。

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