Fig. 1. Experimental setup and light path diagram

Fig. 2. Scattered light at α=0，30°，45°，60° and 90° respectively

Fig. 3. Noise grating in the crystal at different incident angles

Fig. 4. Polarization state of outgoing light at different incident angles

Fig. 5. Light crawling and light scattering model

Fig. 6. The model of polarization state change of scattered light