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標題: Polarization-selective liquid-crystal device and its application to recordable integrated optical
作者: Shih, H.F.
Tsai, C.Y.
關鍵字: grating;integrated optical unit;liquid crystal;multiple-beam;optical;pickup head;polarization-selective;element;head
Project: Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers
期刊/報告no:: Japanese Journal of Applied Physics Part 1-Regular Papers Brief Communications & Review Papers, Volume 44, Issue 10, Page(s) 7491-7493.
A polarization-selective multiple-beam liquid crystal grating (MBLCG) was designed. It can be applied to an integrated optical unit (IOU) for a recordable optical pickup head in small form factor with the functions of recording data using a single beam and retrieving data using multiple beams, respectively. This device is constructed using the technologies of liquid crystal light modulator for switching diffraction effects of a single transmissive beam and multiple diffracted beams. The proposed IOU composes of a laser diode, a photodetector, a MBLCG and a holographic optical element (HOE). The optical axes of the MBLCG and HOE are mutually perpendicular so that the round-trip light efficiency of the IOU can be maximized. Experimental results show that the MBLCG is capable of generating seven diffracted beams with equal light intensities and polarization-selective corresponding to an incident beam of the ordinary or extraordinary state.
ISSN: 0021-4922
DOI: 10.1143/jjap.44.7491
Appears in Collections:機械工程學系所

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