Method and apparatus for controlling the power output of multipl

Details Method and apparatus for controlling the power output of multipl Method and apparatus for controlling the power output of multipl

1995-06-20

1997-02-04

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250206, 372 38, G01J 132

Patent

active

056001266

ABSTRACT:
The present invention presents an apparatus and method for efficiently and automatically monitoring and adjusting the power output of laser diodes used to provide the scanning beams in a ROS system. Light radiated from the back facet of the laser diode is directed onto at least a pair of back facet photodiodes. The photodiode outputs are proportional to the power output of the laser diode associated with the photodiode. The polarization of the laser diode back facet output is controlled so as to ensure that the only outputs from an associated laser diode is sensed by an associated photodiode. In one embodiment, a half wave plate is used to rotate the polarization of one of the laser diodes and in another embodiment optical fibers efficiently transmit light emitted from the back facets to the photodiode.

REFERENCES:
patent: 4625315 (1986-11-01), Lemberger et al.
patent: 4796964 (1989-01-01), Connell et al.
patent: 5019769 (1991-05-01), Levinson
patent: 5311005 (1994-05-01), Visocchi

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