Fig. 1. Setup of feedback wavefront shaping experiment

Fig. 2. Random speckle field formed by a linearly polarized coherent light through a non-polarization-maintaining fiber. (a) Total intensity; (b) intensity of the horizontal polarization component; (c) intensity of the vertical polarization component

Fig. 3. Focal spots and corresponding intensity distribution. (a)(b) Focal spots; (c)(d) intensity distribution along the longitudinal direction

Fig. 4. Intensity distribution and degree of polarization of focal line. (a) Intensity distribution along the longitudinal direction; (b) variation curves of intensity; (c) variation curve of the degree of polarization