Spectrally resolved image of 120 fs laser-produced plasma

Abstract

A linear zone plate surface structure was created on the surface of mica crystal and used for obtaining spectrally resolved images of 120 fs laser-produced plasma. A linear Fresnel zone structure was optimized on a wavelength λ = 9.16 Å and has a focal length of f = 5 cm, minimum zone width Δzn = 300 nm, total length l = 10 cm, total width of zone plate 2rn = 122.6 μm.Images of laser-produced plasma in the spectral range 9.12−9.31 Å were obtained. For high Z (Lanthanum) element target the size of the x-ray radiation spot was not more than 20 μm.

Large-field High Resolution X-ray Monochromatic Microscope, Based on Spherical Crystal and High-repetition-rate Femtosecond Laser-produced Plasma

“…Geometrical optics laws dictate that the spatial resolution that can be obtained in this scheme is limited to the point source size. In our case the size of the plasma X-ray emission zone in the energy range 1È2 keV was at least 20 lm and it was measured in [17] by pin-holes and Bragg-Fresnel mirrors. But our experiments show that despite this large X-ray source, high quality images with large magniÐcations and spatial resolution of about 5 lm can be obtained.…”

“…In the present work we consider the classical X-ray monochromatic microscopes, in which a laser produced plasma, generated by the interaction of intense femtosecond laser pulses with a solid target, was used as a backlighter X-ray source. The laser (which was described in previous works [14,17]) has a pulse width of 120 fs, with energy of 3È5 mJ per pulse and a repetition rate of 10 Hz. The laser pulses are focused on a solid target to a focal spot of D20 lm in diameter [17], to produce power density of 1016 W/cm2.…”

“…The laser (which was described in previous works [14,17]) has a pulse width of 120 fs, with energy of 3È5 mJ per pulse and a repetition rate of 10 Hz. The laser pulses are focused on a solid target to a focal spot of D20 lm in diameter [17], to produce power density of 1016 W/cm2. The plasma formed has an electron density in the order of (0.5È 1.0) ] 1022 cm~3, and electron temperature in the range of 100È200 eV and it emits intense short bursts of X-rays [18,19].…”

Spherically bent mica analyzers as universal dispersing elements for X‐ray spectroscopy

“…This situation suggests that a single SBCA using a mica diffracting element could be used for XES studies over a very wide energy range, using the energy resolution of the final solid-state detector to select an appropriate Bragg harmonic for the fluorescence line of interest. Mica has a long history in X-ray analysis (Aglitskiy et al, 1998;Ao et al, 2014;Blasco et al, 2001;Chen & Wittry, 1997Cheng, 1972;Faenov et al, 1997;Haugh & Stewart, 2010;Lassalle-Kaiser et al, 2013;Mazuritsky et al, 2001;Robbins et al, 2004;Sanchez del Rio et al, 2000;Shi et al, 2008;Wainstein, 1942;Workman, Tierney, Evans, Kyrala, & Benage, 1999;Zhu, Xiong, Zhong, & Yang, 2012), most commonly (but not always (Cheng, 1972)) for lower-energy x-rays because of its large d-spacing, but also benefitting from its high mechanical flexibility, easily enabling curved Bragg optics. These benefits, however, are complicated by possibly nontrivial mosaic spread in natural mica.…”

Shadow monochromatic backlighting: Large-field high resolution X-ray shadowgraphy with improved spectral tunability

“…It has pulse duration of 120 fs, energy of 3-5 mJ per pulse and a repetition rate of 10 Hz. The laser pulses are focused on a solid target to a focal spot of ~20 µm in diameter (Faenov et al 1997) to produce power density of 10 16 W/cm 2 . The plasma formed has electron density in the order of (0.5-1.0)x10 22 cm -3 , electron temperature in the range of 100-200 eV and it emits intense short bursts of X-rays (Doron et al 1998, Fraenkel et al 1999a.…”