Abstract
The recent progress in high-peak-power ultrashort KrF laser technology[1,2] in the ultraviolet region is opening up new possibilities of physics in atomic nonlinear phenomena, nonlinear laser spectroscopy and X-ray laser pumping. In order to accomplish an X-ray laser pumped by a petawatt (100 J/100 fs) KrF laser, the ’SIMBA’ (Superhigh Intensity Mono-Beam Amplifier chain) system was proposed by our X-ray laser group.[3] For scaling the output laser energy of the final amplifier in the SIMBA system, large-aperture windows are necessary because of the small saturation energy of 2 mJ/cm2 of KrF. A new amplifier mode employing a low-pressure KrF laser medium (< 200 Torr) and a short e-beam pumping pulse (10 ns FWHM) for short pulse amplification was proposed for solving the problem of nonlinear processes in the normally thick window material and for improving the pulse/ASE contrast ratio.[4]
© 1992 IQEC
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