All-optical shaping non-conventional beams are demonstrated experimentally by means of spatial cross-phase modulation in the solution of azo-containing material. We report here that an annular beam is able to be generated and manipulated through a light-control-light system, including a focused controlling beam and a parallel controlled beam. As the intensity of controlling light is enhanced above the threshold, the circular dark core turns to a triangular shape gradually. The formation of the polygonal dark core is mainly attributed to the nonaxis-symmetrical thermal convection in the solution sample induced by the heat of controlling light, which breaks the symmetry in vertical direction of the refractive index distribution. In addition, when the controlled light is convergent, a series of concentric rings instead of annular beam is obtained. The formation of two kinds of non-conventional beams is discussed in terms of the conical distribution of the changed reflective index. This all-optical beam shaping reveals potential applications in optical limiting, all-optical modulation, optical trapping, etc.

通过在含偶氮材料溶液中的空间交叉相位调制，通过实验证明了全光学整形非常规光束。我们在这里报告，环形光束能够通过光控光系统产生和操纵，包括聚焦控制光束和平行控制光束。随着控制光强度增强到阈值以上，圆形暗核逐渐变成三角形。多边形暗核的形成主要是由于控制光热引起溶液样品中的非轴对称热对流，打破了折射率分布垂直方向的对称性。此外，当受控光会聚时，会得到一系列同心环而不是环形光束。讨论了两种非常规光束的形成，从改变后的反射率的锥形分布的角度来讨论。这种全光学光束整形揭示了在光限制、全光调制、光捕获等方面的潜在应用。