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Optical head having two vertical cavity surface emitting lasers with different wavelengths

  • US 5,986,998 A
  • Filed: 10/23/1997
  • Issued: 11/16/1999
  • Est. Priority Date: 10/24/1996
  • Status: Expired due to Term
First Claim
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1. An optical pickup comprising:

  • a light source including first and second vertical cavity surface emitting lasers disposed adjacent to each other on a substrate for emitting light having different wavelengths and different divergence angles;

    an objective lens for focusing the light emitted from said light source on a recording surface of a recording medium;

    a photodetector for detecting information signals and error signals by receiving the light reflected from said recording medium;

    a polarized beam splitter disposed on an optical path between said light source and said objective lens to redirect a proceeding path of incident light;

    a wavelength plate disposed on the optical path between said objective lens and said polarized beam splitter to convert a linear polarization component of said incident light to a circular polarization component of said incident light; and

    an isolating plate which is interposed between said first vertical cavity surface emitting laser and said second vertical cavity surface emitting laser to electrically insulate said first and second vertical cavity surface emitting lasers.

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