Soft x-ray emission from ω0, 2ω0, and 4ω0 laser-produced plasmas

Abstract

The soft x-ray spectra from Au plasmas in 0.1–1.6 keV range and x-ray conversion efficiencies of Au (high Z) and Al (low Z) targets with three laser wavelengths of 0.26, 0.53, and 1.05 μm are measured. In addition, the intensity dependence of the x-ray conversion efficiency at 0.26 μm is obtained for Au targets. For 0.26-μm laser light, the conversion efficiency of Au targets can be as high as 80% at an intensity of 2.4×1013 W/cm2.