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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

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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An optical beam generator system for use in an imaging system that forms an image in a substrate, the optical beam having a first power level 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 optical b

An optical beam generator system for use in an imaging system that forms an image in a substrate, the optical beam having a first power level 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 optical beam generator system comprising: a beam generator means for generating a coherent optical beam having a preferred mode in response to received command signals corresponding to an “on”state and for generating an incoherent optical beam in response to received command signals corresponding to an “off”state; state selection means for generating said “on”and “off”command signals corresponding to said “on”and “off”states; and a mode filter means optically coupled to said beam generator means, said mode filter means for attenuating the optical components of the received optical beam not of said preferred mode to a magnitude below said exposure level, wherein during said “on”state said mode filter means performs a minimal attenuation of said coherent optical beam to the first power level, and wherein during said “off”state said mode filter means performs a maximum attenuation of said coherent optical beam to the second power level.