Abstract

The spectrum-resolved radiant energy in 0.17~1.6 keV range from various plane targets irradiated by a 0.53μm laser at 0.15~1.0 nsec pulse through a f/1.4 lens with a nominal incidence angle of either 54° or 0° were obtained by a mutually complementary use of a transmission grating spectrometer, multi-channel filtered X-ray diodes and X-ray calorimeters. Atomic number dependences of the spectrum and X-ray conversion efficiency are described. Especially the radiation investigated at the Au target is concluded to be significantly deviated from the blackbody radiation at the laser intensity range 2×10¹³~2×10¹⁵ W/cm². The conversion efficiency increases as laser pulse duration. The increase at normal incidence is infered to be mainly due to the increase in the laser absorption.

© 1984 Optical Society of America