Optically functional device, single crystal substrate for the device and method for its use
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United States of America Patent
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Jun 8, 2004
Grant Date -
Feb 28, 2002
app pub date -
Mar 5, 2001
filing date -
Aug 25, 2000
priority date (Note) -
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Abstract
An optically functional device comprising a ferroelectric single crystal substrate and polarization-inverted structures formed at portions of the substrate at a temperature of not higher than the Curie temperature by an electron beam scanning irradiation method or a voltage application method and designed to control light passed through the polarization-inverted portions, wherein a LiNbO.sub.3 crystal having a molar ratio of Li/Nb within a range of from 0.95 to 1.01, is used as the substrate, so that the propagation loss of light passed through the polarization-inverted portions immediately after formation of the polarization-inverted structures, is not more than 2%.
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