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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Hi all,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>All are welcome to attend the following talk by Dr John Farmer (U. Dusseldorf) at 3pm on Friday 18<sup>th</sup> September in JA504.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Cheers,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Mark.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Title: "Raman amplification in the coherent wavebreaking regime"<o:p></o:p></p><p class=MsoNormal><br>Abstract: In regimes far beyond the wavebreaking threshold of Raman amplification, we show that significant amplification may occur after the onset of wavebreaking, before phase mixing destroys the coherent coupling between pump, probe and plasma wave. Amplification in this regime is therefore a transient effect, and is sensitive to the laser parameters. Experimental works therefore require careful control of both pump and probe if high energy transfers are to be achieved.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>