Polarization-Selective Liquid-Crystal Device and Its Application to Recordable Integrated Optical Unit

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概要

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• 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.

• Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
• 2005-10-15

著者

• Shih Hsi-Fu

  Department of Mechanical Engineering and Center of Nanoscience and Nanotechnology, National ChungHsing University, 250, Kuo-Kuang Rd., Taichung 402, Taiwan, R.O.C.

• Tsai Chih-Yuah

  Department of Mechanical Engineering and Center of Nanoscience and Nanotechnology, National ChungHsing University, 250, Kuo-Kuang Rd., Taichung 402, Taiwan, R.O.C.

関連論文

• Optical Head with Two Wavelengths in Single Path Using Holographic Optical Element
• Multiple-Beam Liquid Crystal Grating for the Recordable Optical Pickup Head
• Polarization-Selective Liquid-Crystal Device and Its Application to Recordable Integrated Optical Unit

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