Nuter R, Tikhonchuk V
Université Bordeaux-CNRS-CEA, Centre Lasers Intenses et Applications, UMR No. 5107, F-33405 Talence, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Apr;87(4):043109. doi: 10.1103/PhysRevE.87.043109. Epub 2013 Apr 22.
Two-dimensional particle-in-cell (PIC) simulations have been performed to demonstrate how chirping the pump laser beam can make the seed backward Raman amplification more efficient. The PIC code ocean is detailed and validated with theoretical analysis of the three-wave coupling. Particular attention is devoted to the impact of numerical noise on Raman scattering. Once the numerical parameters are set, one- and two-dimensional simulations exhibit the ability to suppress the pedestal pulse preceding the amplified seed laser beam and lower the spontaneous Raman scattering by appropriately choosing the pump chirp value.
已进行二维粒子模拟（PIC），以证明泵浦激光束的啁啾如何能使种子后向拉曼放大更高效。PIC代码ocean已经过详细阐述，并通过三波耦合的理论分析进行了验证。特别关注了数值噪声对拉曼散射的影响。一旦设置了数值参数，一维和二维模拟就能够通过适当选择泵浦啁啾值来抑制放大种子激光束之前的基座脉冲，并降低自发拉曼散射。
