Dependence of spatial coherence of 23.2-23.6-nm radiation on the geometry of a multielement germanium x-ray laser target

R.E. Burge, G.E. Slark, M.T. Browne, X.C. Yuan, P. Charalambous, X.H. Cheng, Ciaran Lewis, G.F. Cairns, A.G. MacPhee, D. Neely

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Abstract

The spatial coherence of a nanosecond pulsed germanium collisionally excited x-ray laser is measured experimentally for three target configurations. The diagnostic is based on Young's slit interference fringes with a dispersing element to resolve the 23.2- and 23.6-nm spectral lines. Target configurations include a double-slab target, known as the injector, and geometries in which the injector image is image relayed to seed either an additional single-slab target or a second double-slab target. A special feature of this study is the observation of the change in the apparent source size with angle of refraction across the diverging laser beam. Source sizes derived with a Gaussian source model decrease from 44 mu m for the injector target by a variable factor of as much as 2, according to target configuration, for beams leaving the additional amplifiers after strong refraction in the plasma. (C) 1998 Optical Society of America [S0740-3224(98)00810-8].
Original languageEnglish
Pages (from-to)2515-2523
Number of pages9
JournalJOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volume15
Issue number10
Publication statusPublished - Oct 1998

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Burge, R. E., Slark, G. E., Browne, M. T., Yuan, X. C., Charalambous, P., Cheng, X. H., Lewis, C., Cairns, G. F., MacPhee, A. G., & Neely, D. (1998). Dependence of spatial coherence of 23.2-23.6-nm radiation on the geometry of a multielement germanium x-ray laser target. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, 15(10), 2515-2523.