Barth Ido, Toroker Zeev, Balakin Alexey A, Fisch Nathaniel J
Princeton Plasma Physics Laboratory, Princeton University, Princeton, New Jersey 08543, USA.
Department of Electrical Engineering, Technion Israel Institute of Technology, Haifa 32000, Israel.
Phys Rev E. 2016 Jun;93(6):063210. doi: 10.1103/PhysRevE.93.063210. Epub 2016 Jun 27.
Backward Raman amplification is limited by relativistic nonlinear dephasing resulting in saturation of the leading spike of the amplified pulse. Pump detuning is employed to mitigate the relativistic phase mismatch and to overcome the associated saturation. The amplified pulse can then be reshaped into a monospike pulse with little precursory power ahead of it, with the maximum intensity increasing by a factor of two. This detuning can be employed advantageously both in regimes where the group velocity dispersion is unimportant and where the dispersion is important but small.
后向拉曼放大受到相对论非线性退相的限制，导致放大脉冲的主峰出现饱和。采用泵浦失谐来减轻相对论相位失配并克服相关的饱和现象。然后，放大后的脉冲可以被整形为一个单峰脉冲，其前面几乎没有前导功率，最大强度增加了一倍。这种失谐在群速度色散不重要的情况下以及色散虽重要但较小的情况下都可以有效地应用。
