Ultrashort-pulse propagation in double Raman gas mixtures with temporal compression

Sergey Alexsandrovich Lobanov; Victor G. Bespalov; Dmitry I. Staselko; Vitaly N. Krylov; I. Fischer

doi:10.1117/12.424691

12 April 2001 Ultrashort-pulse propagation in double Raman gas mixtures with temporal compression

Sergey Alexsandrovich Lobanov, Victor G. Bespalov, Dmitry I. Staselko, Vitaly N. Krylov, I. Fischer

Proceedings Volume 4271, Optical Pulse and Beam Propagation III; (2001) https://doi.org/10.1117/12.424691
Event: Photonics West 2001 - LASE, 2001, San Jose, CA, United States

Abstract

Transient SRS in mixture of two Raman active media (doubled gas mixtures) with pumping by ultrashort (2 ps) pulses was theoretically analysed. The numerical simulations show that there is strong energy exchange between direct Stokes waves and combination Stokes line during ultrashort pulse propagation in gas mixture. It is necessary to achieve the same phase and temporal dependencies of direct Stokes pulses for effective energy conversion in combination Stokes line. One-peak pulse generation in combination Stokes line with temporal compression is possible at pump intensity from threshold value up to doubled level. The decrease of duration of pulse by 12 times at conversion efficiency of 6% was shown. Increase of input pump energy causes destruction of Stokes pulses form and formation of multipeak Stokes pulses. The results show that the optimum ratio of gas pressure for transient SRS generation of sum and difference combination Stokes lines is proportional to the relation of the g/T2 of mixture components or to the relation of their Raman cross-sections. Our calculation is in good agreement with experimental results1.

Citation Download Citation

Sergey Alexsandrovich Lobanov, Victor G. Bespalov, Dmitry I. Staselko, Vitaly N. Krylov, and I. Fischer "Ultrashort-pulse propagation in double Raman gas mixtures with temporal compression", Proc. SPIE 4271, Optical Pulse and Beam Propagation III, (12 April 2001); https://doi.org/10.1117/12.424691

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KEYWORDS

Raman spectroscopy

Gases

Phonons

Differential equations

Frequency conversion

Hydrogen

Methane

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