Method and apparatus for generating an optical beam for use in a

Details Method and apparatus for generating an optical beam for use in a Method and apparatus for generating an optical beam for use in a

1996-07-02

1997-06-17

Ngo, John

Optical waveguides

With optical coupler

Particular coupling function

372 24, 372 38, 385140, G02B 626

Patent

active

056404735

ABSTRACT:
An optical beam generator system for use in an imaging system that forms an image in a substrate comprises a beam generator, a mode filter and a state selector. The optical beam has a first power level above an exposure level that exposes the image in the substrate and a second power level below the exposure level which does not expose the substrate. The beam generator generates a near single mode coherent optical beam in response to received command signals corresponding to an "on" state and generates a multimode incoherent optical beam in response to received command signals corresponding to an "off" state. The filter is optically coupled to the beam generator and attenuates an optical component of the received optical beam which is not single mode to a magnitude below the exposure level. The state selector generates the "on" and "off" command signals corresponding to the "on" and "off" states such that the filter outputs the coherent optical beam with minimal attenuation during the "on" state and with maximum attenuation during the "off" state.

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