论文标题
在刺激的布里鲁因散射期间，抑制圆柱矢量梁中轨道角动量叠加的相结合
Inhibition of the phase conjugation of orbital angular momentum superpositions in cylindrical vector beams during stimulated Brillouin scattering
论文作者
论文摘要
与刺激的布里鲁因散射相结合可用于纠正高功率激光系统中的波前像差。在这里，我们考虑使用圆柱矢量激光器束的过程。通过使用矢量方法和模态分解，我们获得了一个差分矩阵方程，该方程能够计算Stokes Vector eigenmodes及其Brillouin增益的结构。重点放在最大增益的模式上，这对Stokes Beam贡献最大。我们表明，圆柱矢量梁中轨道角动量的相结合阻碍了高阶庞加莱球体几乎所有地方发生。这种现象可追溯到斯托克斯束的趋势获得类似于入射泵束的极化结构，这限制了两种轨道角动量模式的拓扑电荷的可能组合，构成了Stokes cylindrical vector梁。然而，在高阶庞加莱球体的极点附近，具有最大增益的Stokes模式获得了额外的螺旋相因子，该因子会产生共轭拓扑电荷，从而在不影响极化结构的情况下为更强的圆形极化组件而产生。发现实验结果与我们的理论预测一致。
Phase conjugation with stimulated Brillouin scattering can be used to correct wavefront aberrations in high-power laser systems. Here, we consider such process with cylindrical vector lasers beams. By using a vectorial approach and a modal decomposition, we obtain a differential matrix equation that enables the calculation of the structure of Stokes vector eigenmodes and their Brillouin gain. The emphasis is put on the mode with the largest gain, which contributes the most to the Stokes beam. We show that the phase conjugation of orbital angular momentum in cylindrical vector beams is prevented from happening almost everywhere on the higher-order Poincaré sphere. This phenomenon is traced to the tendency of the Stokes beam to acquire a polarization structure similar to the incident pump beam, which constraints the possible combinations of topological charges of the two orbital angular momentum modes making up the Stokes cylindrical vector beams. However, near the poles of the higher-order Poincaré sphere, the Stokes mode with the largest gain acquires an additional helical phase factor that produces the conjugated topological charge for the stronger circularly polarized component without affecting the polarization structure. Experimental results are found to agree with our theoretical predictions.
