Investigation of laser plasma expansion in an ambient gas by high-speed photography

Fast shadow visualization of a pulsed discharge in a short gas gap

“…Note at once that the phenomenon of stratification in each such experiment is given by reasons of a quite definite nature. When the laser plasma expands in the background gas, the density stratification is observed behind the SW front and arises due to the separation of the laser plasma and the SW [22,23] by the contact interface, which does not contradict our hypothesis. Moreover, at the intensity of laser radiation in the focusing spot ∼ 10 9 W/cm 2 , SW begins to form even in a solid target [24].…”

“…A similar phenomenon was predicted theoretically and observed experimentally for laser plasma. The instability development leads first to the growth of small perturbations and then passes into the turbulence stage [44]. As for the second object, it was previously shown by mathematical modeling methods that a stationary flow in the relaxation zone can be unstable with respect to turbulence [4,45].…”

Sculpted pulsed indium atomic beams via selective laser ablation of thin film

“…; lithographỹ Khare et al, 2004;Nakata et al, 2002, 2004!, and production of atomic beams~Chae & Park, 1997Breton et al, 1980;Kadar-Kallen & Bonin, 1994;Alti & Khare, 2006a!. Pulsed laser ablation techniques for the production of atomic beam~Chae & Park, 1997; Breton et al, 1980;Kadar-Kallen & Bonin, 1994! Whenever a high power laser is focused on a target material, the laser fluence or the intensity at the focal spot is very large, and therefore substantial portion of the material ejected out from the target is converted into the plasma, and the expansion of the material is hemispherical Alti & Khare, 2006a;Anan'in et al, 1991;Weaver & Lewis, 1996;Mishra & Thareja, 1999!. It has ability to produce high atomic flux with energies from cold to super-thermal range.…”