Efficiency of 1.5-4.5 keV x-ray production from 2 ps duration KrF laser pulses incident onto solid targets

摘要

Laser to x-ray conversion efficiencies from solid targets irradiated by KrF laser pulses of wavelength 248 nm are measured. A 16-bit front illuminated open electrode 1024 x 256 pixel x-ray CCD camera working in single photon counting mode is used to record the x-ray output from Al, Cl, Ag, and Ti emitting in the 1.5-4.5 keV photon energy range. X-ray conversion efficiencies up to values of similar to0.2% (2pi sr)(-1) are obtained with pulses of duration 2 ps irradiating the targets at 12 Hz with peak irradiance of 1.9 X 10(16) W cm(-2). [References: 14]