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Transient absorption and laser gain in e-beam-excited Ar/Kr/NF3(F2 + N2) gas mixtures

Published online by Cambridge University Press:  15 March 2011

N.N. Ustinovskii ,
A.O. Levchenko  and
V.D. Zvorykin
N.N. Ustinovskii*
Affiliation:
Lebedev Physics Institute, Moscow, Russia
A.O. Levchenko
Affiliation:
Lebedev Physics Institute, Moscow, Russia
V.D. Zvorykin
Affiliation:
Lebedev Physics Institute, Moscow, Russia
*
Address correspondence and reprint requests to: N.N. Ustinovskii, Lebedev Physics Institute, Leninsky Prospect 53, Moscow 119991, Russia. E-mail: [email protected]
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Abstract

Newly developed erosion-plasma-source probe technique has been applied for virtually single shot recording of absorption/fluorescence spectra in the 190–510 nm spectral range of e-beam-excited Ar/Kr/NF3(F2 + N2) mixtures. The e-beam excitation rate of about 1 MW/cm3 is typical of large-volume rare-gas halide lasers. It is experimentally observed that, in Kr/F2 and Ar/F2 mixtures, fluorescence and absorption spectra of Rg2F species are shifted with respect to each other in the opposite direction. Continuous absorption spectrum of Ar2F excimer is reported, as far as we know, for the first time in the refereed literature. Strong overlapping between the fluorescence and absorption spectra of Ar2F is responsible for absence of lasing on Ar2F molecule. Absorption spectrum of Kr2F excimer is recorded in pure form using the mixture (Ne/Kr/F2) with no alternative broadband absorber. Minor additive of nitrogen to Ar/Kr/F2 mixture or use of NF3 instead of F2 has been found to result in broadband optical amplification centered at λ ~ 460 nm. The maximum optical gain is estimated as about 0.1 ± 0.05 m−1.

Keywords

Gain measurementRare-gas halide lasersTransient absorption probeUV-visible molecular spectra
Type
Research Article
Information
Laser and Particle Beams , Volume 29 , Issue 1 , March 2011 , pp. 141 - 152
Copyright
Copyright © Cambridge University Press 2011

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