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Planar gold layers of thickness 50-200 nm, both free-standing and supported on substrates of 1 micron polypropylene, were irradiated with 3-ns laser pulses of 0.53 micron wavelength at 1.0 E12 and E13 W/cm2. The X-ray emission from the rear and front of the target was measured with symmetrically placed X-ray diodes and X-ray transmission grating film spectrometers. The transmitted laser light was also monitored. Under optimised conditions it was possible to obtain up to 30% conversion of the laser energy in the form of soft X-rays from the rear surface of the target with less than 2% laser light transmission. The measured overall conversion efficiency was approximately in agreement with hydrodynamic simulations. The spectral and temporal features of the emission are discussed with respect to the opacity of the hot dense target material.

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Authors: CELLIERS P, Max-Planck-Institut für Quantenoptik, Garching bei München (DE);EIDMANN K, Max-Planck-Institut für Quantenoptik, Garching bei München (DE)
Bibliographic Reference: Article: Physical Review, Vol. 41 (1990) No. 6, pp. 3270-3280
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