Charles S. Sahagian Chief, Electromagnetic Materials Technology Branch Deputy for Electronic Technology Hanscom AFB, MA 01731 I t should not be surprising that an event as significant as the discovery of the laser has had some con comitant impact on other areas of science and technology, but the extent of the impact was grossly unpredicted. Upon perusal of this bibliography, devoted to the subject of laser window and mirror materials, it becomes very apparent that the effect of the laser on materials R&D has been enormous. Several hundred papers and reports, representing millions of dollars of effort, have been promulgated over the past decade; and as new frequencies, improved tunability, higher power, and other charac teristics are achieved, we can expect even greater demands and requirements on the materials com munity. What are some of the highlights disclosec by this bibliography with regard to work already ac complished? First, one can note the extensive investigations into developing new materials while at the same time improving old ones. Among the latter, alkali halides, for example, have essentially had a rebirth. I n the past five years more progress has been achieved in the chemical and structural perfec tion of this class of materials than in the entire preceding century. Also carried along in the surge for improved laser materials have been the alkaline earth fluorides (prime candidates for 3-to 5-J, Lm ap plications), chalcogenides, semiconductors, oxides, and others."

Coverage This bibliography of over 5000 references is restricted to the crystal growth of inorganic materials and is largely drawn from the literature collection of the Research Materials Information Center, although other sources were used in the attempt to attain (an always unattainable) completeness. It includes theoretical, review, and experimental, or "recipe," papers, technical reports, and books. The period covered is from 1972 through 1977, with several hundred more recent and earlier references, for var ious reasons, added. (I nformation on specific materials not I isted may be requested from R M C. ) I The coverage of epitaxy presented a problem, since authors do not always make it clear whether or not the epitaxial growth described resulted in single or polycrystalline structures. Papers are of course included where single crystallinity was claimed or illustrated by a definite electron diffraction pattern. Stated attempts to grow single crystals, even when failures, are included. As for the many where a decision could not be made, exclusion was the general rule. Theoretical and review papers are included. Two books, ofthe many good books on crystal growth, are essential complements to this bibliography: The Chemistry of Imperfect Crystals, 2nd Revised Edition. Volume 1, Preparation, Purification, Crystal Growth and Phase Theory Kroger, F. A. North-Holland Publishing Company, Amsterdam-London; American Elsevier Publishing Company, Inc., New York (1973) (Includes an extensive tabulation of crystals grown by a variety of methods, with over 1100 references for the table alone. ) Crystal Growth Wilke, K. -T."

Man's first experience with the ordered state of matter to which we now apply the generic term "crystals" came about when he found specimens of some of the natural crystalline mineral substances that are re latively common in the surface and near-surface areas of the earth's crust. His first widespread use of these natural materials in which their crystalline nature was of importance was undoubtedly in fabricating jewelry and otherwise adorning his weapons, tools, and household items. Both the Old and New Testa ments of the Bible document the use of crystalline gems, and the Romans are credited with first employing diamonds-a metastable crystalline form of carbon-in jewelry. Various civilizations appear to have ascribed magical powers to some natural crystals, and they are known to have been widely accepted in Europe as having medicinal properties during the Middle Ages. Given early man's appreciation of the symmetry and beauty of natural crystals, it is not surprising that his earliest interest in working with these materials appears to have been directed toward techniques for duplicating or manufacturing these sub stances that were so highly valued as gems. Although the exact beginning of the science that we now know as "crystal growth" cannot be precisely specified, we do know that Robert Boyle had attempted to grow crystals that could be used as gems prior to 1672. Much later, in 1873, M. A."