High power light source

Details High power light source High power light source

1994-03-24

1995-10-31

Husar, Stephen F.

Illumination

Revolving

362234, 362240, 362259, 362268, 359318, F21V 704

Patent

active

054635349

ABSTRACT:
An optical system for producing a high power light source comprises a number of laser diodes, or similar sources, which emit light from an emission stripe 8 having a long dimension a (x-axis) and a short dimension b (y-axis) and which have a higher numerical aperture in the y-axis than in the x-axis. The laser beams 9 are collimated by a lens 10 and focused onto an optical fiber by a further lens 20. Prior to the focusing, the collimating beams 11 are anamorphically expanded/reduced by beam shaping means 12 so that the width of each beam 11 in the x-axis is increased in relation to the width in the y-axis. The images 21 produced on the fiber end are thus anamorphically magnified so that thte anamorphic ratio between the magnification of the stripe 8 in the y-axis and in the x-axis is greater than one. By the brightness theorem, this anamorphic magnification results in a correspondingly relative decrease in the y-axis numerical aperture to enable a corresponding increase in the number of beams 11, which can fit into the solid angle of the target.

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