Demonstration of laser pulse amplification by stimulated Brillouin scattering

作     者：E.Guillaume K.Humphrey H.Nakamura R.M.G.M.Trines R.Heathcote M.Galimberti Y.Amano D.Doria G.Hicks E.Higson S.Kar G.Sarri M.Skramic J.Swain K.Tang J.Weston P.Zak E.P.Alves R.A.Fonseca F.Fi ′uza H.Habara K.A.Tanaka R.Bingham M.Borghesi Z.Najmudin L.O.Silva P.A.Norreys 

作者机构：Laboratoire d'Optique Appliqu′ee Ecole PolytechniquePalaiseau 91128 France STFC Rutherford Appleton LaboratoryDidcot Oxon OX11 0QX United Kingdom University of StrathclydeGlasgow G11XQ United Kingdom Blackett Laboratory Imperial College London Prince Consort RoadLondon SW7 2BZ United Kingdom Graduate School of Engineering Osaka University Queens University BelfastBelfast BT7 1NN United Kingdom University of Oxford Parks RoadOxford OX1 3PU United Kingdom 

出 版 物：《High Power Laser Science and Engineering》 (高功率激光科学与工程(英文版))

年 卷 期：2014年第4期

页      面：46-51页

学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学] 

基　　金：supported by the UK Science and Technology Facilities Council by the Engineering and Physical Sciences Research Council supported by the Royal Society Newton International Fellowship the Japan Society for the Promotion of Science 

主　　题：laser–plasma interactions optical pulse generation and compression stimulated Brillouin and Raman scattering ultra-fast optical processes 

摘      要：The energy transfer by stimulated Brillouin backscatter from a long pump pulse(15 ps) to a short seed pulse(1 ps)has been investigated in a proof-of-principle demonstration experiment. The two pulses were both amplified in different beamlines of a Nd:glass laser system, had a central wavelength of 1054 nm and a spectral bandwidth of 2 nm, and crossed each other in an underdense plasma in a counter-propagating geometry, off-set by 10?. It is shown that the energy transfer and the wavelength of the generated Brillouin peak depend on the plasma density, the intensity of the laser pulses, and the competition between two-plasmon decay and stimulated Raman scatter instabilities. The highest obtained energy transfer from pump to probe pulse is 2.5%, at a plasma density of 0.17 ncr, and this energy transfer increases significantly with plasma density. Therefore, our results suggest that much higher efficiencies can be obtained when higher densities(above0.25ncr) are used.