METHOD AND DEVICE FOR COUPLING A LIGHT BEAM INTO A FOIL
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United States of America Patent
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Aug 7, 2014
app pub date -
Sep 3, 2012
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Sep 6, 2011
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Abstract
The invention relates to a method and an optical device (150) in which a light beam (L) is coupled into a transparent component, for example into a foil (110). The incoupling is achieved by astigmatically focusing a light beam (L) onto an oblong entrance window (W) of the foil (110), wherein a focal line (Fx) of the light beam (L) is oriented along the axis (x) of extension of the entrance window (W). Preferably, a second focal line (Fy) of the light beam (L) is disposed inside the transparent component (110) below a region of interest (112).
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