Method of heat-treating an oxide optical crystal and a heat trea

Compositions – Light transmission modifying compositions – Inorganic crystalline solid

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252587, 423583, 423593, 423594, 423598, 423610, 423617, 423632, 385141, G02B 520, F21V 904, C01B 1504

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active

054263107

ABSTRACT:
A heat treatment method heats an oxide optical crystal in an oxygen atmosphere containing ozone to improve the light absorption characteristics of the oxide optical crystal so that the light absorption of the oxide optical crystal with light in wavelength bands other than light in wavelength bands with which the oxide optical crystal exerts the intrinsic absorption is reduced to the least possible extent. Guided-optical-wave propagation devices and optical devices, such as optical isolators, optical recording media and second harmonic generators, employing the oxide optical crystal having these improved absorption characteristics, operate at a high efficiency.

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