Soft X-Ray Spectra from Laser-Heated Cryogenic Rare-Gas Targets

Soft x-ray spectra in the wavelength range of 3 to 18 nm from Ar, Kr, and Xe cryogenic targetsirradiated by 1-μm pulse laser at a laser intensity IL of 0.2 to 1.0×1012 W/cm2 have been observed. At a laser intensity of IL=1×1012W/cm2, the x-ray conversion efficiencies were 0.4%/sr/10%bw at the spectral peak of 3.2 nm for the Ar target, 0.7%/sr/10%bw at 10.0 nm for the Kr target, and 1.4%/sr/10%bw at 10.8 nm for the Xe target.