Optical memory with injection laser as light source and detector

Patent · Tue Dec 23 04:00:00 EST 1980

OSTI ID:6516752

Burke, W J; Ettenberg, M; Kressel, H

In an optical memory device, such as an optical video disk, an injection laser is used as the source of the light, as the detector of the light reflected from the memory element and as the detector for controlling the proper focus of the light on the memory element. The light reflected from the memory element is fed back into the injection laser and variations in certain characteristics of the injection laser, such as the optical output at constant current, the electrical current through the laser at constant voltage and the voltage drop across the laser at constant current, are used to read the memory device and to maintain the focus.

• Assignee: RCA Corp.
• Patent Number(s): US 4241423
• OSTI ID: 6516752
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300 -- Engineering-- Lasers-- (-1989)
99 GENERAL AND MISCELLANEOUS
990300* -- Information Handling
DESIGN
EQUIPMENT
FOCUSING
LASERS
LIGHT SOURCES
MEMORY DEVICES
MODULATION
OPTICAL EQUIPMENT
OPTICAL REFLECTION
RADIATION SOURCES
REFLECTION
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
USES