Among all available material, the semi-insulator (GaAs:Cr; InP:Fe) and sillenite (Bi12GeO20; Bi12SiO20) crystals are attractive because of their high photosensitivity. It is now well known that the magnitude of the two-wave mixing gain which is usually low in fast materials could be considerably enhanced by applying a square wave field to the crystal.

© 1989 Optical Society of America

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