Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Nonlinear Scattering of the 248-nm Wavelength Light in High-Pressure SF6 and CH4 Gases for a Temporal Compression of 20-Ns KrF Laser Pulse

Vladimir D. Zvorykin
* ORCID logo ,
Gocha G. Metreveli
,
Igor V. Smetanin
,
Alexey V. Shutov
,
Nikolay N. Ustinovskii
,
Polad V. Veliev
Version 1 : Received: 1 December 2023 / Approved: 4 December 2023 / Online: 4 December 2023 (15:14:24 CET)

A peer-reviewed article of this Preprint also exists.

Zvorykin, V.D.; Metreveli, G.E.; Smetanin, I.V.; Shutov, A.V.; Ustinovskii, N.N.; Veliev, P.V. Nonlinear Scattering of 248 nm Wavelength Light in High-Pressure SF6 and CH4 Gases for the Temporal Compression of a 20 ns KrF Laser Pulse. Photonics 2024, 11, 39. Zvorykin, V.D.; Metreveli, G.E.; Smetanin, I.V.; Shutov, A.V.; Ustinovskii, N.N.; Veliev, P.V. Nonlinear Scattering of 248 nm Wavelength Light in High-Pressure SF6 and CH4 Gases for the Temporal Compression of a 20 ns KrF Laser Pulse. Photonics 2024, 11, 39.

Abstract

Nonlinear compression of narrow-band (Δ ≈ 0.2 cm-1) 20 ns KrF laser pulses in SF6 at 10 atm and CH4 at 50 atm pressure was studied. Both SBS and SRS optically phase conjugated backward reflected radiation was registered with energy reflectivity 10−14% in SF6 and CH4. In SF6 SBS pulses gradually shortened from 10 ns to 2−3 ns with pumping decrease to the SBS threshold ~ 10 mJ, while the SRS pulse had the shortest length of 30−60 ps for the maximal pumping of 120 mJ and broadened near the SRS threshold of ~30 mJ. For the SRS pulse energy ~ 2 mJ peak power 5×107 W was tenfold higher than the pump power. The theoretical model predicted a soliton-like SRS pulse compression to a temporal length of the order of vibrational relaxation time. There was no pulse compression of backward SBS and SRS radiation in CH4, while in the forward direction SRS pulses shortened to 3−4 ns at reduced pumping.

Keywords

KrF laser pulse compression; stimulated Brillouin and Raman scattering in SF6 and CH4; theory of soliton-like pulse compression.

Subject

Physical Sciences, Optics and Photonics

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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