Spatial coherence of transient stimulated Raman scattering

Sergey A. Lobanov; Victor G. Bespalov

doi:10.1117/12.528253

14 June 2004 Spatial coherence of transient stimulated Raman scattering

Proceedings Volume 5337, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III; (2004) https://doi.org/10.1117/12.528253
Event: Lasers and Applications in Science and Engineering, 2004, San Jose, Ca, United States

Abstract

Numerical model describing transient stimulated Raman scattering and taking into account diffraction was developed and Stokes wave evolution in compressed hydrogen was simulated to study space-time dynamics of amplitude-phase SRS characteristics. Space-time intensity and phase dependencies as well as spectrum and spatial coherence function of pump and Stokes waves were obtained. Considerable difference in mentioned characteristics was found out for transient and quasi-stationary stimulated Raman scattering modes. More complicated space-time dependencies are typical for transient mode in comparison with quasi-stationary mode. However, under quasi-stationary conditions Stokes wave phase varies in wider limits, which results in spatial coherency lowering. Module of spatial coherency function value lowers to threshold and then becomes stable as conversion coefficient increases. Presence of Stokes beam focusing is shown at stimulated Raman scattering, which can be explained by competition of strong Raman amplification and diffraction. Results of simulations are in good agreement with experimental data.

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Sergey A. Lobanov and Victor G. Bespalov "Spatial coherence of transient stimulated Raman scattering", Proc. SPIE 5337, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications III, (14 June 2004); https://doi.org/10.1117/12.528253

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KEYWORDS

Raman scattering

Diffraction

Numerical analysis

Spatial coherence

Hydrogen

Numerical simulations

Phonons

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