Coherence properties of a quasi-Gaussian submilliradiant divergence soft-x-ray laser pumped by capillary discharges
- Department of Physics, University of L'Aquila, gc LNGS of INFN, 67010 Coppito, L'Aquila (Italy)
- ENEA Dipartimento Innovovazione, Divisione Fisica Applicata, CRE Frascati, Cassella Postale 65, 00044 (Italy)
The coherence properties of a 46.9-nm soft-x-ray laser beam produced in a capillary discharge plasma have been investigated. The beam is produced in a regime that is free from the effect of refraction defocusing, with a divergence of only 0.5-0.6 mrad. The discharge plasma is produced in capillary channels with length of 45 cm, where the Fresnel number of the gain medium is of the order of unity. The full laser energy is about 300 {mu}J. The spatial coherence of the laser has been experimentally investigated using a Young's double-slit interferometer and analyzed assuming a Gaussian Schell-model source and the generalized Van Cittert-Zernike theorem. We demonstrate the achievement of almost full spatial coherence and a near-Gaussian intensity distribution.
- OSTI ID:
- 20645958
- Journal Information:
- Physical Review. A, Vol. 70, Issue 2; Other Information: DOI: 10.1103/PhysRevA.70.023818; (c) 2004 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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