Versatile objective lens with adjustable correction for different wavelengths and substrate thicknesses for testing optical disks

Ronald E. Gerber, M. Mansuripur, José M. Sasián

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A typical aspheric singlet used as the objective lens in optical-disk data-storage systems will not work at different wavelengths or with different substrate thicknesses because of spherochromatism. Using two microscope objectives with adjustable collars and a pair of relay lenses, we have constructed a system in which a diffraction-limited spot of any wavelength in the range of 0.4-0.7 mm can be moved by as much as ±100 μm in both the focusing and tracking directions. We accomplished this by simply moving an aspheric singlet mounted in an off-the-shelf optical head. The system uses the adjustable collars of the microscope objectives to correct for the spherochromatism of the singlet and to accommodate the various thicknesses of the substrates.

Original languageEnglish (US)
Pages (from-to)2414-2420
Number of pages7
JournalApplied optics
Volume36
Issue number11
DOIs
StatePublished - Apr 10 1997

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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