Autofocusing system for a laser transmitter

Details Autofocusing system for a laser transmitter Autofocusing system for a laser transmitter

1997-04-11

1999-02-02

Healy, Brian

Coherent light generators

Particular resonant cavity

Specified cavity component

372 9, 372 20, 372 24, 372 25, 372 92, 372101, 235462, 235454, 235463, 235466, H01S 308, G06K 710

Patent

active

058675221

ABSTRACT:
An autofocusing system for a laser transmitter is provided. A laser beam is swept across a target having a plurality of sections. The target includes a first reflective section and a second reflective section with a non-reflective section positioned therebetween. A photodetector detects a signal representative of the laser beam reflected from the target. The laser beam is focused by adjusting the focusing lens until a ratio of the duration of the non-reflective portion of the signal to the sum of the durations of the reflective portions of the signal is maximized.

REFERENCES:
patent: 5122644 (1992-06-01), Hasegawa et al.
patent: 5302812 (1994-04-01), Li et al.
patent: 5440111 (1995-08-01), Eastman et al.
patent: 5479011 (1995-12-01), Rudeen et al.
patent: 5703351 (1997-12-01), Meyers

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