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Proceedings Paper

Amplification of femtosecond pulses at 126 nm in optical field-induced plasma filamentation in Ar
Author(s): Shoichi Kubodera; Kazuyuki Fujiyoshi; Masanori Kaku; Masahito Katto
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Paper Abstract

We have observed an optical gain at the wavelength of 126 nm in an Ar excimer (Ar2 *) amplifier by utilizing a femtosecond vacuum ultraviolet (VUV) seed beam tuned at 126 nm. The maximum optical gain value of 1.1 cm-1 with a spatial distribution in the optical-field-induced ionization (OFI) Ar plasma was observed. The plasma diagnosis revealed that the plasma contraction near the plasma amplifier axis together with the plasma expansion was a key issue to observe such a high optical gain value inside the Ar plasma filament. The center axis of the contracted plasma amplifier showed the high electron density more than 1018 cm-3 even after 100 ns from the plasma production of Ar at 1 MPa. Our OFI plasma/excimer kinetics code reproduced the temporal progress of the optical gain distribution as well as the maximum gain value.

Paper Details

Date Published: 13 January 2017
PDF: 6 pages
Proc. SPIE 10254, XXI International Symposium on High Power Laser Systems and Applications 2016, 1025414 (13 January 2017); doi: 10.1117/12.2256014
Show Author Affiliations
Shoichi Kubodera, Soka Univ. (Japan)
Kazuyuki Fujiyoshi, Univ. of Miyazaki (Japan)
Masanori Kaku, Univ. of Miyazaki (Japan)
Masahito Katto, Univ. of Miyazaki (Japan)

Published in SPIE Proceedings Vol. 10254:
XXI International Symposium on High Power Laser Systems and Applications 2016
Dieter Schuoecker; Richard Majer; Julia Brunnbauer, Editor(s)

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