Optical disc drive apparatus with an indirect semiconductor laser containing an asymmetric quantum well structure

Abstract

An indirect semiconductor laser having an indirect semiconductor used as the material of an active layer is used, instead of a conventional direct semiconductor laser so as to obtain a reproducing optical source, in order to reduce optical interference noise of the laser caused in the optical head in an optical disc apparatus, and to eliminate the necessity of high frequency wave convolution, thereby it is possible to reduce the cost.

1 . A data recording apparatus comprising an indirect semiconductor laser, and a laser driver for controlling the laser in an oscillation mode with a broad band. 
     
     
         2 . A data communication equipment comprising an indirect semiconductor laser, and a laser driver for controlling the laser in an oscillation mode with a broad band. 
     
     
         3 . An optical disc apparatus comprising a motor for rotating a medium, and an indirect semiconductor laser serving as a light source, and a laser driver for controlling the laser in an oscillation mode with a broad band. 
     
     
         4 . A computer equipment comprising an optical disc apparatus using an optical head characterized by a semiconductor laser having an active layer made of an indirect semiconductor mixed crystal material, and a detector for detecting a reflected light beam from a medium.