Ferroelectric material, two-color holographic recording medium, and wavelength selection filter
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United States of America Patent
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Issued Date -
Nov 25, 2004
app pub date -
Mar 12, 2004
filing date -
Mar 14, 2003
priority date (Note) -
Abandoned
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Abstract
A ferroelectric material in which the refractive index change can be induced by irradiation with light at two different wavelengths without performing a reduction treatment or doping impurities. The ferroelectric material of the invention in which the refractive index change is induced by irradiation with light at two different wavelengths is a lithium tantalate single crystal with the composition of Li.sub.2O/(Li.sub.2O+Ta.-sub.2O.sub.5)=0.4966 to 0.4995. Preferably, the ferroelectric material is a lithium tantalate single crystal with the composition of Li.sub.2O/(Li.sub.2O+Ta.sub.2O.sub.5)=0.4974 to 0.4989. Preferably, the infrared absorption coefficient in the [OH] stretching mode falls within a range of 0 cm.sup.-1 to 0.15 cm.sup.-1 (0 cm.sup.-1 and 0.15 cm.sup.-1 are included in the range).
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