还讨论了q板的波面演化过程，找出波面的拓扑结构变化的原因，为以后使用q板改变更复杂波面的拓扑结构提供参考。
We also discuss the evolution of optical wavefront in q plate , and found the reason why it break topology of the wavefront , these results is useful for changing the topology of the more complex wavefront .
Q板