Title :
Digital shearing interferometer with a liquid-crystal spatial light modulator
Author :
Zhao, S. ; Chung, P.S.
Author_Institution :
Dept. of Electron. Eng., City Univ. of Hong Kong, China
Abstract :
A novel shearing interferometer is developed using a dynamic grating realized by a twisted nematic liquid-crystal spatial light modulator as the shearing element. A standard phase shifting algorithm can be easily achieved by changing the grating pattern displayed on the spatial light modulator. A shearing interferometer with no moving part and no requirement for calibration of the value of the phase shift was therefore achieved.
Keywords :
diffraction gratings; light interferometers; liquid crystal devices; nematic liquid crystals; phase shifting interferometry; spatial light modulators; digital shearing interferometer; dynamic grating; grating pattern; liquid-crystal spatial light modulator; phase shift; shearing interferometer; standard phase shifting algorithm; twisted nematic liquid-crystal; Adaptive optics; Calibration; Digital modulation; Gratings; Lenses; Optical imaging; Optical interferometry; Optical modulation; Phase shifting interferometry; Shearing;
Conference_Titel :
Lasers and Electro-Optics Society, 2005. LEOS 2005. The 18th Annual Meeting of the IEEE
Print_ISBN :
0-7803-9217-5
DOI :
10.1109/LEOS.2005.1548333
