Re. Burge et al., SPATIAL COHERENCE OF X-RAY LASER-EMISSION FROM NEON-LIKE GERMANIUM AFTER PREPULSE, Journal of the Optical Society of America. B, Optical physics, 14(10), 1997, pp. 2742-2751
The time-integrated spatial coherence of neonlike germanium x-ray lase
r radiation has been studied with a new dispersing coherence diagnosti
c. Angle-dependent spatial coherence data are recorded by sampling the
diverging beam at each lasing wavelength in several directions simult
aneously. Measurements of the spatial coherence, and hence effective s
ource sizes, relevant to the output beams from double-slab targets for
the J = 2-1 spectral lines at wavelengths 28.6, 23.6, and 23.2 nm and
for the J = 0-1 line at 19.6 nm show differences, which indicate diff
erent conditions in the plasma volume amplifying these emissions. Targ
ets are pumped by subnanosecond pulse drivers, with and without a prep
ulse, but 19.6 nm emission is detected only in the prepulsed case. The
differences are discussed in terms of the time evolution of the spect
ral lines. (C) 1997 Optical Society of America.