О ВЛИЯНИИ СТРУКТУРЫ МИШЕНИ НА ЭФФЕКТИВНОСТЬ ГЕНЕРАЦИИ ЛАЗЕРНОЙ ПЛАЗМЫ

Abstract

Spatial restrictions on heat transfer imposed in foil and sintered powder titanium targets have resulted not only in sufficient efficiency of gas-plasma flows generation increase as compared to bulk Ti targets (especially at low laser fluences), but also in change of the pattern of momentum coupling coefficient Cm dependency on laser fluence F form convex to concave. Minimum difference Cm in values for bulk and foil targets was 1.68 times, maximum - 1.5 orders of magnitude (always higher for foil). At the impact on sintered porous targets momentum coupling coefficient was lower than for foil of the same Ti (Cm(F) dependency pattern was identical), but normalised by mass density, the results became about equal. To our mind, this confirms the role of heat dissipation processes in decrease of efficiency at the impact on bulk targets.