Stimulated Raman scattering in compressed gases by short laser pulses

Alexander I. Vodchits; Wolfgang Werncke; S. Hogiu; Valentin A. Orlovich

doi:10.1117/12.418810

12 March 2001 Stimulated Raman scattering in compressed gases by short laser pulses

Alexander I. Vodchits, Wolfgang Werncke, S. Hogiu, Valentin A. Orlovich

Proceedings Volume 4352, Laser Optics 2000: Ultrafast Optics and Superstrong Laser Fields; (2001) https://doi.org/10.1117/12.418810
Event: Laser Optics 2000, 2000, St. Petersburg, Russian Federation

Abstract

Stimulated Raman scattering (SRS) excited by picosecond pulses (3.5 - 4 ps) of a synchronously pumped dye laser has been studied in compressed methane, hydrogen and their mixture. Physical energetic SRS-efficiencies (corrected for the linear losses of the optical elements) up to about 55 - 60% and 35 - 37% for the generation of the first vibrational Stokes radiation were reached in methane at a pressure of 60 bar and at excitation wavelengths near 600 nm and 740 nm, respectively. SRS-efficiencies versus pump pulse energy, pressure of gas and temporal duration of laser pulses were studied at 600 nm in methane. A very rich spectrum of Raman lines (including some vibrational, vibrational-rotational and combination Raman lines) was observed in the mixture of methane (35 bar) and hydrogen (25 bar). The energy efficiency of SRS-conversion to the 1-st rotational Stokes Raman line of hydrogen reached about 20% in the mixture. In contrast, the 1-st vibrational Stokes components of hydrogen and methane were substantially suppressed in this mixture. Our measurements demonstrate that methane is one of the most suitable Raman media for obtaining effective SRS-generation especially at pico- and femtosecond excitation because of its suitable parameters controlling the SRS-process and that the mixtures of compressed gases are rather promising Raman media for extending the tuning range of pico- and femtosecond laser systems and for optimizing the efficiencies of SRS-conversion to the different Raman components.

Citation Download Citation

Alexander I. Vodchits, Wolfgang Werncke, S. Hogiu, and Valentin A. Orlovich "Stimulated Raman scattering in compressed gases by short laser pulses", Proc. SPIE 4352, Laser Optics 2000: Ultrafast Optics and Superstrong Laser Fields, (12 March 2001); https://doi.org/10.1117/12.418810

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