Functional Materials and Acousto-optic Instruments Institute;
School of Instrumentation Science and Engineering;
Harbin Institute of Technology;
Harbin 150080;
China;
School of Civil Engineering;
Harbin Institute of Technology;
Harbin 150001;
China;
Materials Research Institute;
The Pennsylvania State University;
University Park;
Pennsylvania 16802;
USA;
Polarizing light microscopy; Polarization distribution; Ferroelectric single crystals; Chromatic polarization;