Stimulated scattering of focused light beams

Betin, A. A.; Pasmanik, G. A.

doi:10.1070/qe1974v003n04abeh005505

Cited by 6 publications

(3 citation statements)

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“…Transient SRS in slowly varying amplitude and phase approach can be described by system of nonlinear parabolic differential equations: (1) is not obtained yet we use numerical method to solve these equations. Suggested algorithm is based on specific of system of equations (1). Indeed, the system can be reformulated as…”

Section: Srs Equations and Numerical Methodsmentioning

confidence: 99%

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<title>Time and spatial dynamics of SRS amplitude-phase characteristics</title>

Lobanov¹,

Bespalov

2004

SPIE Proceedings

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The numerical model of stimulated Raman scattering (SRS) taking into account spatial dynamics of amplitude-phase characteristics and consisting of non-linear partial parabolic differential equations is developed. A fmite -difference numerical method was used to solve these equations. Results of simulation are in good agreement with experimental data. INTRODUCTIONStimulated Raman scattering in compressed gases can be effectively used to build lasers with frequency varying within wide range starting from ultra-violet up to infrared region. CW and pulsed lasers with nano-, piko-and femto-second pulse duration can be developed based on SRS nonlinearity. Spectral, spatio-temporal and power SRS characteristics contain information about scattering processes and nonlinear material. They are significant from practical and scientific points of view.The most important issue at SRS processes study is to define how radiation temporal characteristics evolve at radiation propagation in nonlinear material. These characteristics are intensity and phase time dependence, radiation spectrum. Actually the majority ofpublications about SRS are devoted to study oflisted above characteristics but spatial dynamics is also of interest as real sources radiation is limited in cross-section and is widening at radiation propagation in material. That is why we should consider diffraction effects at SRS generation study. Taking into account radiation intensity and phase variation in cross-section we can analyze such characteristics as spatial coherence function and spatio-temporal phase and intensity dependencies.

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Section: Srs Equations and Numerical Methodsmentioning

confidence: 99%

“…An attempt to analytically solve equation describing Stokes evolution in case of stationary SRS and in assumption of undepleted pump was made in paper [1]. The same authors proposed numerical solution of quasi-stationary SRS problem based on few additional assumptions [2].…”

Section: Introductionmentioning

confidence: 99%

<title>Time and spatial dynamics of SRS amplitude-phase characteristics</title>

Lobanov¹,

Bespalov

2004

SPIE Proceedings

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“…(see for instance [2][3][4]). Attention has mostly been paid to the reproduction and phase conjugation of light beams, formed at Raman scattering, and only relatively small amount of effort has been devoted to the consideration of the spatial dynamics of the amplitude-phase characteristics of Raman waves [5][6][7][8][9]. The characteristics of Stokes components at Raman scattering have been mostly analyzed both theoretically and experimentally in gases at relatively small distances of interaction [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of spatial modes of the Raman scattering stokes component radiation excited in an extensive multimode waveguide

Kitsak

2007

SPIE Proceedings

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We conduct a theoretical analysis of the Stokes component mode structure of the Raman scattering. The Raman scattering is excited in a multimode waveguide with pump radiation having statistics corresponding to the model of the narrow-band Gaussian noise. We obtain an analytical relation connecting the number of spatially coherent modes of the Stokes component, characteristics of the waveguide and conditions of the Raman scattering excitation. It follows from the obtained relation that the Raman scattering spatial coherency degree at the waveguide's exit is determined by the number of the spatial modes of pump radiation and the amplification of the Stokes radiation throughout the waveguide's length. There exists a threshold in the amplification corresponding to the unlimited increase of the number of the spatially coherent modes of the Raman scattering and therefore to a zero of spatial coherency. Conducted estimations show that at the Raman scattering threshold value of the radiation intensity the number of the spatially coherent modes of the Raman scattering Stokes component should be comparable to that of the thermal source. Experimentally, measured dispersion of the spatial intensity fluctuations of the Stokes component isolated with an interference filter (spectral bandwidth ~ 1nm, λ = 620nm) is three time smaller than that of the luminescent lamp radiation

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Effect of diffraction on stimulated Brillouin scattering from a single laser hot spot

et al. 1996

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A single laser hot spot in an underdense plasma is represented as a focused Gaussian laser beam. Stimulated Brillouin scattering (SBS) from such a Gaussian beam with small f/numbers 2-4 has been studied in a three-dimensional slab geometry. It is shown that the SBS reflectivity from a single laser hot spot is much lower than that predicted by a simple three wave coupling model because of the diffraction of the scattered light from the spatially localized ion acoustic wave. SBS gain per one Rayleigh length of the incident laser beam is proposed as a quantitative measure of this effect. Diffraction-limited SBS from a randomized laser beam is also discussed.

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Stimulated scattering of focused light beams

Cited by 6 publications

References 0 publications

<title>Time and spatial dynamics of SRS amplitude-phase characteristics</title>

<title>Time and spatial dynamics of SRS amplitude-phase characteristics</title>

Analysis of spatial modes of the Raman scattering stokes component radiation excited in an extensive multimode waveguide

Effect of diffraction on stimulated Brillouin scattering from a single laser hot spot

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