Real-time measurement of the fast axis angle of a quarter-wave plate based on simultaneous phase shifting technique is presented. The simultaneous phase shifting function is realized by an orthogonal grating, a diaphragm, an analyzer array, and a 4-quadrant detector. The intensities of the light beams from the four analyzers with different azimuths are measured simultaneously. The fast axis angle of the quarter-wave plate is obtained through the four light intensity values. In this method, rotating elements are not required, so real-time measurement is achieved.
© 2008 Chinese Optics Letters
(050.5080) Diffraction and gratings : Phase shift
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(260.1440) Physical optics : Birefringence
(260.5430) Physical optics : Polarization
Kun Yang, Aijun Zeng, Xiangzhao Wang, Hua Wang, and Feng Tang, "Real-time measurement of the fast axis angle of a quarter-wave plate based on simultaneous phase shifting technique," Chin. Opt. Lett. 6, 568-571 (2008)