Soft x-ray spectroscopy and heat transport in plasmas created by high-contrast fs-laser pulses

Recent results on constructing of an efficient hard X-ray source using solid targets irradiated by high-contrast 200-fs laser pulses with an intensity above 1016W/cm2are presented. We used different solid targets with a laser- and electrochemically modified surface layer: craters, pyramidal cavities, porous silicon, gratings. Experimental data obtained confirms that using solid targets with a corrugated surface one can achieve a prominent increase both in the efficiency of hard X-ray generation (in the quanta range 2–30 keV) and in the hot electron temperature of plasma.

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Demonstration of thin film compression for short-pulse X-ray generation

International Journal of Modern Physics A ◽

10.1142/s0217751x19430152 ◽

2019 ◽

Vol 34 (34) ◽

pp. 1943015

Author(s):

D. M. Farinella ◽

M. Stanfield ◽

N. Beier ◽

T. Nguyen ◽

S. Hakimi ◽

...

Keyword(s):

Thin Film ◽

Imaging System ◽

Short Pulse ◽

Laser Pulses ◽

Single Cycle ◽

X Ray ◽

Ultrafast Laser Pulses ◽

Solid Density ◽

Fs Laser ◽

Gaussian Mode

Thin film compression to the single-cycle regime combined with relativistic compression offers a method to transform conventional ultrafast laser pulses into attosecond X-ray laser pulses. These attosecond X-ray laser pulses are required to drive wakefields in solid density materials which can provide acceleration gradients of up to TeV/cm. Here we demonstrate a nearly 99% energy efficient compression of a 6.63 mJ, 39 fs laser pulse with a Gaussian mode to 20 fs in a single stage. Further, it is shown that as a result of Kerr-lensing, the focal spot of the system is slightly shifted on-axis and can be recovered by translating the imaging system to the new focal plane. This implies that with the help of wave-front shaping optics the focusability of laser pulses compressed in this way can be partially preserved.

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Picosecond X-ray Diffraction: System and Applications

Advances in X-ray Analysis ◽

10.1154/s0376030800017614 ◽

1994 ◽

Vol 38 ◽

pp. 21-33

Author(s):

I. V. Tomov ◽

P. Chen ◽

P. M. Rentzepis

Keyword(s):

Heat Transport ◽

Time Resolution ◽

Laser Pulses ◽

X Ray Diffraction ◽

Time Resolved ◽

X Ray ◽

Silicon Crystals ◽

193 Nm ◽

Gold Platinum

Abstract We report the development of a novel, pulsed x-ray diffraction system with picosecond time resolution. The system has been used to study the heat transport in gold, platinum and silicon crystals heated by 10 ps, 193 nm laser pulses. Further developments and applications of time resolved picosecond x-ray diffraction are discussed.

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