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

Chi Hung Lee*, Yi Chiu, Han Ping D. Shieh

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Scopus citations

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.

Original languageEnglish
Article number075201
JournalOptical Engineering
Volume48
Issue number7
DOIs
StatePublished - 3 Aug 2009

Keywords

  • Actuator
  • Diffractive optical element
  • Optical pickup head
  • Swing arm

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