Spatio-temporal analysis of high-power laser micro-structured targets interaction

Abstract

The present work reports the development of an optimized ultra-intense laser—solid target interaction system which aims to achieve higher intensities for different pulse durations, down to few-cycle regime, considering different micro-structured profiles of the internal cone target walls. A spatio-temporal analysis of the electromagnetic field in the interaction area is elaborated in order to provide a complex description of this approach. The numerical analysis is made by using the finite difference time domain (FDTD) method. The results are explained in correspondence with the extension of the Rayleigh range and it is relevant for a wide range of ultra-short and ultra-intense laser experiments planned at laser facilities in petawatt regimes.

Characterizing spatio-temporal aspects of chirped pulse amplification laser micro-cone target interaction

“…The output residual aberrations of the CPA pulse generally cause a wide range of inconveniences which may significantly affect the quality of the ultrashort recompressed pulses. Considering the previously elaborated studies in the field of spatio-temporal distortions [21][22][23][24][25][26][27] and laser-matter interactions [28,29], in the present work, we analyse the effect of spatio-temporal distortions of a CPA laser beam at the interaction with a micro-cone target in order to determine the optimum conditions to minimize residual aberrations in order to create the proper conditions for extreme intensification in the vicinity of laser-conical target interaction point [27,28]. For this, a series of laser configurations based on CPA technique were designed using a raytracing model performed with Optica-Mathematica software and a complex study for spatio-temporal distortions compensation was elaborated in order to optimize the laser beam used for interactions with micro-cone targets.…”

An analytical model to calculate the primary and secondary acoustic forces acting on microbubbles due to a short pulsed laser excitation

“…In this work, an analytical expression of the photoacoustic wave resulting from a short pulsed laser is presented for a combination of a spatial profile described by a zeroth-order Bessel function of the first kind and a temporal profile modeled by a Gaussian function. The radial profile of a pulsed laser has been modeled by several functions such as delta, rectangular, and Gaussian functions [48]. Gaussian model is one of the realistic approaches since the interaction of light with matter is very localized in space and time.…”