Hybrid surface emitting laser and detector

Details Hybrid surface emitting laser and detector Hybrid surface emitting laser and detector

1988-06-30

1990-03-06

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Housings

250211J, 357 19, H01J 502

Patent

active

049068393

ABSTRACT:
The present invention is a combined surface emitting semiconductor laser and photodetector in a single housing with the photodetector positioned to detect light emitted from the surface emitting laser and reflected off of a medium. The surface emitting laser is mounted on the top surface of a chip which includes at least one set of two photodetectors for detecting a reflected beam. At least two photodetectors are used so that spacial variations in the reflected beam can be detected for focusing and tracking when the device is used in an optical head. Photodetectors are arranged to intersect a diffracted beam from a hologram lens used in an optical head. A rear emission photodetector for monitoring the power of the surface emitting laser is positioned so that it will not receive diffracted light which will interfere with its operation.

REFERENCES:
patent: 4733067 (1988-03-01), Oinoue et al.
patent: 4736231 (1988-04-01), Ayabe et al.
patent: 4764931 (1988-08-01), Matsuda
patent: 4772784 (1988-09-01), Yoshitosh et al.

Affiliated with

Also associated with

Rating

Hybrid surface emitting laser and detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hybrid surface emitting laser and detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hybrid surface emitting laser and detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-49018