短波长激光超热电子产生与抑制机理的研究

STUDIES ON THE PRODUCTION AND SUPPRESSION MECHANISM OF THE HOT ELECTRONS PRODUCED BY SHORT WAVELENGTH LASER 

介绍了在“神光Ⅰ”和“星光Ⅱ”上分别进行的二倍频、三倍频激光照射金盘靶、腔靶、碳氢有机膜平面靶的实验.通过测量硬X射线谱推断超热电子特性,结合受激Raman散射光和双等离子体衰变产生的(3/2)ω0谐波的观测,分析各种靶超热电子产生和抑制的机理,并探讨了抑制超热电子的有效途径.

The experiments on gold\|disk and hohlraum and plastic hydrocarbon foil targets irradiated by laser beams with wavelengths 0 35?μm (Xingguang\|Ⅱ) and 0.53?μm (Shenguang\|Ⅰ) are performed.The characteristics of hot electrons are commonly deduced from the spectrum of hard X\|ray.Associated with the measurement of backward stimulated Raman scattering and (3/2) ω 0,the production mechanism of hot electrons for different target types is analyzed in laser plasma with shorter wavelength.An effective way to suppress hot electrons has been found.