S. Sebban et al., Saturated amplification of a collisionally pumped optical-field-ionizationsoft X-ray laser at 41.8 nm, PHYS REV L, 86(14), 2001, pp. 3004-3007
We report the first saturated amplification of an optical-field-ionization
soft x-ray laser. The amplifying medium is generated by focusing a circular
ly polarized 330-mJ, 35-fs, 10-Hz Ti:sapphire laser system in a few-mm cell
filled with xenon. A gain of 67 cm(-1) on the 4d(9)5p-4d(9)5d transition a
t 41.8 nm in Pd-like xenon and a gain-length product of 15 have been inferr
ed at saturation. This source delivers about 5 X 10(9) photons per pulse. T
he influence of the pumping energy and the laser polarization on the lasing
output are also presented.