Optical head having two vertical cavity surface emitting lasers

Details Optical head having two vertical cavity surface emitting lasers Optical head having two vertical cavity surface emitting lasers

1997-10-23

1999-11-16

Dinh, Tan

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4423, 369 4437, 369 94, 369122, 372 43, 372 50, G11B 700, H01S 319

Patent

active

059869984

ABSTRACT:
An optical pickup which can be employed for different formats of a disk recording medium is disclosed. The optical pickup device includes a light source including first and second vertical cavity surface emitting lasers closely disposed to each other for emitting light having different wavelengths and different radiation angles, an objective lens for focusing the light emitted from the 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 the recording medium, a polarized beam splitter disposed on an optical path between the light source and the objective lens to redirect a proceeding path of incident light, and a wavelength plate disposed on the optical path between the objective lens and the polarized beam splitter to convert a polarization component of incident light.

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