Design of an integrated optical pickup with NA of 0.85 for small form factor optical disk drives

J. S. Sohn, S. H. Lee, M. S. Jung, T. S. Song, N. C. Park, Y. P. Park

Research output: Contribution to journalReview article

6 Citations (Scopus)

Abstract

We design an integrated optical pickup for small form factor optical disk drives. The specifications of the pickup are compatible with those of the Blu-ray disk (BD) in terms of numerical aperture (NA) of the objective lens, the wavelength of the laser diode, and the thickness of the cover layer. The objective lens unit with NA of 0.85 consists of two aspherical refractive lenses and a diffractive optical element for compensation of the chromatic aberration. Each element of objective lens unit will be fabricated on a wafer as an array type, and the three wafers will be aligned and bonded to form an objective lens array. Therefore, elements of the objective lens unit are designed to have sufficient alignment tolerances for various directions such as de-center and tilt. The optical performances of the objective lens unit are evaluated by simulation against various disturbances such as wavelength change of emitting light from laser diode, misalignments, etc. We also design a quarter wave plate, a polarized holographic optical element, and the shape of photodiode integrated circuit array to generate focusing and tracking error signals. The entire height of the pickup including working distance is 2 mm, and the effective pupil diameter of the objective lens unit is less than 1mm.

Original languageEnglish
Pages (from-to)457-463
Number of pages7
JournalMicrosystem Technologies
Volume11
Issue number7
DOIs
Publication statusPublished - 2005 Aug 1

Fingerprint

optical disks
Pickups
numerical aperture
form factors
Lenses
lenses
sensors
Semiconductor lasers
semiconductor lasers
wafers
Holographic optical elements
Diffractive optical elements
holographic optical elements
Wavelength
error signals
pupils
Photodiodes
Aberrations
wavelengths
misalignment

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Hardware and Architecture
  • Electrical and Electronic Engineering

Cite this

Sohn, J. S. ; Lee, S. H. ; Jung, M. S. ; Song, T. S. ; Park, N. C. ; Park, Y. P. / Design of an integrated optical pickup with NA of 0.85 for small form factor optical disk drives. In: Microsystem Technologies. 2005 ; Vol. 11, No. 7. pp. 457-463.
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Design of an integrated optical pickup with NA of 0.85 for small form factor optical disk drives. / Sohn, J. S.; Lee, S. H.; Jung, M. S.; Song, T. S.; Park, N. C.; Park, Y. P.

In: Microsystem Technologies, Vol. 11, No. 7, 01.08.2005, p. 457-463.

Research output: Contribution to journalReview article

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