High-power collimating lens assemblies, and methods of reducing the optical power density in collimating lens assemblies
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United States of America Patent
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Aug 27, 2013
Grant Date -
Oct 27, 2011
app pub date -
Dec 11, 2008
filing date -
Dec 11, 2008
priority date (Note) -
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Abstract
The present invention provides improved collimating lens assemblies (32) which include: a singlemode fiber (38) terminating in a distal end; a step-index multimode fiber (44) having a proximal end abutting to the singlemode fiber distal end, and having a distal end; a graded-index multimode fiber (45) having a proximal end abutting the step-index multimode fiber distal end, and having a distal end; and a collimating lens (34) longitudinally spaced from the graded-index multimode fiber distal end by an intermediate air gap (43), and operatively arranged to collimate light rays emanating from the graded-index multimode fiber distal end. The improved collimating lens assembly is characterized by the fact that there is no epoxy, silicone gel or index-matching material between the graded-index multimode fiber distal end and the collimating lens.
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