Phase-induced polarization modulation has been achieved experimentally by means of the all-optical holographic method. An extra spiral phase is added to a Gaussian beam and then a holographic grating is recorded through the interference of a Gaussian beam and the phase-vortex beam with the same linear polarization state in an azobenzene liquid-crystalline film. We report here that the polarization state of the diffraction light from the recorded grating is different from that of the incident light, while no polarization variation occurs for the holographic grating recorded by two Gaussian beams. The phase-induced polarization modulation is mainly attributed to the formation of birefringence in the film generated by phase vortex, which is investigated through the ripple patterns resulting from the competition between photoinduced torques and analysed by the Jones matrix. The experimental results could enrich the connotation between optical parameters and offer a method to realize polarization modulation through phase control.

已经通过全光全息方法通过实验实现了相位感应偏振调制。将额外的螺旋相位添加到高斯光束中，然后通过偶氮苯液晶薄膜中具有相同线性偏振态的高斯光束和相涡旋光束的干涉来记录全息光栅。我们在这里报告，来自记录光栅的衍射光的偏振态与入射光的偏振态不同，而对于由两个高斯光束记录的全息光栅，偏振态没有发生变化。相位诱导的偏振调制主要归因于由相位涡旋产生的薄膜中的双折射的形成，通过光感应转矩之间竞争产生的纹波模式进行调查，并通过琼斯矩阵进行分析。实验结果可以丰富光学参数之间的内涵，为通过相位控制实现偏振调制提供一种方法。