Spectral linewidth of a Ne-like Ar capillary discharge soft x-ray laser and its dependence on amplification beyond gain-saturation

Journal Article · Sun Jan 01 04:00:00 EST 2012 · Physical Review A

DOI:https://doi.org/10.1103/PhysRevA.85.033837· OSTI ID:1049801

Urbanski, Lukasz ^[1]; Marconi, Mario ^[1]; Meng, L. M. ^[1]; Berrill, Mark A ^[2]; Guilbaud, O. ^[3]; Klisnick, Annie ^[3]; Rocca, Jorge ^[1]

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1. Colorado State University, Fort Collins
2. ORNL
3. Universite Paris Sud, Orsay, France

We report the measurement of the linewidth and temporal coherence of a = 46.9 nm neon-like argon capillary discharge soft x-ray laser and its variation with plasma column length. A wavefront division interferometer was used to resolve the 3p 1S0-3s 1P1 laser line, resulting in a measured relative linewidths of / = 3-4 10 -5. The measurements do not observe saturation re-broadening as this clearly dominantly Doppler-broadened inhomogeneous line is amplified beyond the intensity corresponding to gain saturation. Model simulations indicate that this is the result of comparatively small collisional broadening that homogenizes the line profile to practically eliminate inhomogeneous saturation re-broadening. Collisional re-distribution is computed to only play a minor role in homogenizing the line profile.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: ORNL LDRD Director's R&D
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1049801
• Journal Information: Physical Review A, Journal Name: Physical Review A Journal Issue: 3 Vol. 85; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFICATION
ARGON
INTERFEROMETERS
LASERS
PLASMA
SATURATION
X-RAY LASERS