Multimode optical source and image scanning apparatus using the

Details Multimode optical source and image scanning apparatus using the Multimode optical source and image scanning apparatus using the

1996-07-16

1998-10-06

Pham, Hoa Q.

Optical: systems and elements

Lens

Anamorphic

359669, 359207, G02B 1308

Patent

active

058186450

ABSTRACT:
A focused laser beam is provided using a multimode laser of a type that generates a diverging beam with an asymmetric cross section. A collimation lens receives and substantially collimates the diverging asymmetric beam. An anamorphic beam expander enlarges a width of the substantially collimated beam in a first, multimode axis without substantially affecting the width of the beam in a second, single mode axis orthogonal to the first axis. Demagnification optics are arranged to receive and demagnify the enlarged width beam to produce a focused spot. The demagnification optics can include a cylindrical lens ("rod lens") having a longitudinal axis and arranged to receive the enlarged width beam in a direction substantially perpendicular to the axis. The demagnification optics are merged with scanning optics to produce a scanned spot imaging system. The apparatus is particularly useful for exposing images, e.g., in a dye sublimation printer.

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