The three-part treatment Photorefractive Effects, Materials and Applications offers comprehensive treatments of the fundamental phenomena, materials and the applications. Volume I deals with the basic phenomena of photorefraction. A comprehensive treatment of photorefractive effects in crystals is given. The book reviews our present understanding of the fundamental origins of the effect in a variety of materials from ferroelectrics to compound semiconductors, organic crystals and polymers. This book has been prepared for researchers in the field as well as for students of solid-state physics and engineering. The chapters contain and convey a thorough understanding of the photorefractive effect, as well as providing a useful reference source for researchers already involved in this field.