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].
|Number of pages||9|
|Journal||JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS|
|Publication status||Published - Oct 1998|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
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.