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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."
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