The time dependence of the spatial coherence of the combined spectral lines at 23.2 and 23.6 nm from the Ge xxiii collisionally pumped soft-x-ray laser with a double-slab target is examined within a single nanosecond pulse by use of Young’s interference fringes and a streak camera. High source intensity is linked with low spatial coherence and vice versa. Calculations of the source intensity, size, and position have also been made; these calculations refer to a single-slab source. Comparison between the observed and calculated intensities, and of the source sizes both calculated and derived from the Young’s fringes by interpretation with a Gaussian model of source emission, show good agreement in general trends.
© 1998 Optical Society of America
(030.1640) Coherence and statistical optics : Coherence
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(340.7440) X-ray optics : X-ray imaging
(340.7460) X-ray optics : X-ray microscopy
R. E. Burge, G. E. Slark, M. T. Browne, X.-C. Yuan, P. Charalambous, Z. An, X.-H. Cheng, C. L. S. Lewis, A. G. MacPhee, and D. Neely, "Time dependence of the spatial coherence of the 23.6- and 23.2-nm radiation from the germanium soft-x-ray laser," J. Opt. Soc. Am. B 15, 1620-1626 (1998)