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Optical crystals survived in information technology systems

Miyazawa S.

Opto-Electronics Review

2003

Vol. 11, No. 2

77-84

Different optical crystals are reviewed from the viewpoint of their optical properties, among which typical crystals survived in the recent information technology (IT) systems. Most of revived or survived crystals are somehow traditional ones because of their established properties. Potential applications of oxide crystals into shorter wavelengths are focused as additional ripple effects of the impetuous deployment of the IT. Some recent activities on developing new crystals are described briefly ; GdVO₄ with a large walk-off angle as a birefringent crystal, Y₂O₃ as a new laser host, periodically poled ferroelectric LiNbO₃ and LiTaO₃ crystals as effective devices of frequency conversion, and traditional sapphire as a potential substrate of GaN-LEDs.