Application of a Polarizing Holographic Optical Element to a Recordable Optical Head

Autor:	Kousei Sano, Ken'ichi Kasazumi, Hiroaki Yamamoto, Hidenori Wada, Seiji Nishino, Tetsuo Saimi
Rok vydání:	1996
Předmět:	Materials science business.industry Holographic optical element General Engineering Holography General Physics and Astronomy Photodetector Near and far field Optical polarization Laser law.invention Optics law Optical recording business Optical disc
Zdroj:	Japanese Journal of Applied Physics. 35:357
ISSN:	1347-4065 0021-4922
DOI:	10.1143/jjap.35.357
Popis:	A polarizing holographic optical element (HOE) with compensating grooves on the surface of a LiNbO3 substrate has good polarizing beam-splitter characteristics. This polarizing HOE was applied to a recordable optical head with an integrated laser and photodetector unit. In the optical head, a correct far-field tracking method is constructed by setting the polarizing HOE and a quarter-wave plate right under the objective lens, which can be moved with the objective lens. A holographic pattern of the polarizing HOE is divided into 20 portions along a disc track direction for spot size focus error detection and far field tracking detection. Wth this optical head, conventional CD play-back and recording signals on phase change discs were performed. Then the tracking offset caused by objective lens shift was measured and determined to be markedly decreased. Signal degradation by the ±1 st light diffracted by a polarizing HOE was not observed. Good characteristics of recording and play-back for phase change discs were also obtained. This recordable optical head was found to have desirable characteristics and high productivity.
Databáze:	OpenAIRE
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