Coherence properties of a quasi-Gaussian submilliradiant divergence soft-x-ray laser pumped by capillary discharges

Journal Article · Sun Aug 01 04:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.023818· OSTI ID:20645958

Ritucci, A; Tomassetti, G; Reale, A ^[1]; Flora, F; Mezi, L ^[2]

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1. Department of Physics, University of L'Aquila, gc LNGS of INFN, 67010 Coppito, L'Aquila (Italy)
2. 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, Journal Name: Physical Review. A Journal Issue: 2 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
CAPILLARIES
DISTRIBUTION
GAIN
GAS LASERS
INTERFEROMETERS
LASER RADIATION
LENGTH
PLASMA
REFRACTION
SOFT X RADIATION
VISIBLE RADIATION
X-RAY LASERS