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Optical Engineering

Astigmatic diffractive optical element for swing-arm-type optical pickup head
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Paper Abstract

Based on a finite-conjugate objective lens with numerical aperture of 0.62 for a 650-nm wavelength, an optical pickup head composed of a multifunction beamsplitter and a diffractive optical element is designed be used in a swing-arm-type optical pickup head. The diffractive optical element is a lens with an elliptical four-level phase profile to provide both focusing and astigmatism. It is also designed with the goal to simplify the overall optical configuration and provide linear characteristics for the focus error signal.

Paper Details

Date Published: 1 July 2009
PDF: 5 pages
Opt. Eng. 48(7) 075201 doi: 10.1117/1.3158944
Published in: Optical Engineering Volume 48, Issue 7
Show Author Affiliations
Chi-Hung Lee, National Chiao Tung Univ. (Taiwan)
Yi Chiu, National Chiao Tung Univ. (Taiwan)
Han-Ping David Shieh, National Chiao Tung Univ. (Taiwan)

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