Multi-beam optical system and method with power detection of ove

Details Multi-beam optical system and method with power detection of ove Multi-beam optical system and method with power detection of ove

1991-10-28

1993-03-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

356222, H01J 4014

Patent

active

051912040

ABSTRACT:
A dual beam laser array provides two overlapping beams for use in a direct read after write (DRAW) optical data storage system. A first portion of the overlapping beams is directed to a first optical detector and a second portion of the overlapping beams is directed to a second optical detector. A logic circuit connected to the optical detectors generates power signals representative of the power levels of each of the overlapping beams without the need to completely separate the beams.

REFERENCES:
patent: 4297653 (1981-10-01), Scifres et al.
patent: 4660983 (1987-04-01), Yamamoto et al.
patent: 4733067 (1988-03-01), Oinoue et al.
patent: 4847848 (1989-07-01), Inoue et al.
patent: 4873429 (1989-10-01), Kume et al.
patent: 4877311 (1989-10-01), Shernoff
patent: 5043775 (1991-08-01), Lee
"Laser-power monitor system for two-laser array-has front and back detectors placed in overlapping collimated beams and back facets of laser array which are masked", Research Disclosure #313107, Apr. 20, 1990.
"Laser diode angular orientation sensing technique-directing light form external helium-neon alignment laser to diode laser and monitoring direction of light-reflected", Research Disclosure #313101, May 5, 1990.
"Laser package e.g. for optical storage disc servo electronics-has integral photodiode for power emission monitoring, and measures fraction of laser power output back-reflected from power output window", Research Disclosure #290086, Jun. 10, 1988.

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