Finite-duration Seeding Effects in Powerful Backward Raman Amplifiers

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In the process of backward Raman amplification (BRA), the leading layers of the seed laser pulse can shadow the rear layers, thus weakening the effective seeding power and affecting parameters of output pulses in BRA. We study this effect numerically and also analytically by approximating the pumped pulse by the ''*-pulse'' manifold of self-similar solutions. We determine how the pumped pulse projection moves within the *-pulse manifold, and describe quantitatively the effective seeding power evolution. Our results extend the quantitative theory of BRA to regimes where the effective seeding power varies substantially during the amplification. These results might be of ... continued below

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896 Kilobytes pages

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Yampolsky, N.A.; Malkin, V.M. & Fisch, N.J. July 14, 2003.

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Description

In the process of backward Raman amplification (BRA), the leading layers of the seed laser pulse can shadow the rear layers, thus weakening the effective seeding power and affecting parameters of output pulses in BRA. We study this effect numerically and also analytically by approximating the pumped pulse by the ''*-pulse'' manifold of self-similar solutions. We determine how the pumped pulse projection moves within the *-pulse manifold, and describe quantitatively the effective seeding power evolution. Our results extend the quantitative theory of BRA to regimes where the effective seeding power varies substantially during the amplification. These results might be of broader interest, since the basic equations, are general equations for resonant 3-wave interactions.

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896 Kilobytes pages

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INIS; OSTI as DE00814707

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  • Other Information: PBD: 14 Jul 2003

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  • Report No.: PPPL-3839
  • Grant Number: AC02-76CH03073
  • DOI: 10.2172/814707 | External Link
  • Office of Scientific & Technical Information Report Number: 814707
  • Archival Resource Key: ark:/67531/metadc740912

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  • July 14, 2003

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  • Oct. 18, 2015, 6:40 p.m.

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  • April 15, 2016, 9:20 p.m.

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Yampolsky, N.A.; Malkin, V.M. & Fisch, N.J. Finite-duration Seeding Effects in Powerful Backward Raman Amplifiers, report, July 14, 2003; Princeton, New Jersey. (digital.library.unt.edu/ark:/67531/metadc740912/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.