Low thermal stress birefringence imaging lens
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United States of America Patent
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Jun 30, 2015
Grant Date -
Feb 6, 2014
app pub date -
Oct 1, 2013
filing date -
May 21, 2010
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Abstract
An imaging lens having reduced susceptibility to thermally-induced stress birefringence for imaging an object plane to an image plane; comprising a plurality of lens elements. The lens element that experiences a highest optical power density is fabricated using a glass having a negligible susceptibility to thermal stress birefringence as characterized by the thermal stress birefringence metric. The other lens elements are fabricated using glasses having a negligible or a moderate susceptibility to thermal stress birefringence, at least one of the other lens elements being fabricated using a glass having a moderate susceptibility to thermal stress birefringence.
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