Non-collinear spectral coherent combination of ultrashort laser pulses

Abstract

Non-collinear spectral coherent combining (NCSCC) of ultrashort pulses is analyzed. 2D modeling of the electromagnetic field is performed in case of NCSCC using two or three pulses with different wavelengths. In the case of two pulses, a potentially unwanted spatio-temporal structure of the field appears, corresponding to spatial and temporal modulation of the pulse. By using NCSCC of three 62 fs long pulses with different spectral composition, such spatial-temporal coupling is eliminated and the combined pulse duration in the focal region drops to less than half. The method is scalable to a large number of ultrashort pulses.

Modeling the interaction of an ultra-high intensity laser pulse with nano-layered flat-top cone targets for ion acceleration

“…The study of the electromagnetic field distribution is based on the finite-difference time-domain (FDTD) method for solving Maxwell equations and it was used to determine the electromagnetic field in the vicinity of the femtosecond pulses-nanolayered flat-top cone target interaction point for different nano-layer foils and nanospheres dimensions. A lot of FDTD studies have been elaborated in order to determine the optimum conditions for extreme electromagnetic field generation [41][42][43]. We must emphasize that in these simulations it is considered only the propagation of the electromagnetic field through the target without any other processes such as ionization.…”

“…This study is based on finite-difference timedomain (FDTD) method for solving Maxwell equations and it was used to determine the electromagnetic field in the vicinity of the femtosecond pulses−nano-layered flat-top cone target interaction point for different nano-flat-top foils and nanospheres dimensions. A lot of FDTD studies had been elaborated in order to determine the optimum conditions for extreme electromagnetic field generation [21,22,23]. This method aims to provide a complementary approach to the PIC simulations.…”

Modeling the interaction of an ultra-high intensity laser pulse with an ultra-thin nanostructured foil target

“…This numerical method solves Maxwell equations to determine the field amplitude in the vicinity of the femtosecond pulses-nanostructured foil target interaction area for the same foils and nanospheres dimensions as those used in PIC simulations. Lately, plenty of FDTD studies have been elaborated in order to determinate necessary computations and predefined schemes for extreme electric field generation [51][52][53]. Here, in the numerical simulations of the EMF propagation through the target by FDTD method we do not consider the ionization process and plasma formation.…”

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.…”