ABSTRACT
A. N. Dharamsi and A. B. Hassam; J. Ac. Soc. Am.; 90, 1186, 1991
A previous discussion (J. Acoustical Soc. Am. 85, 1560, 1989) on the
energy band structure of target materials, suitable for generation of
ultrashort optoacoustic pulses by photostriction, is extended and formalized.
Details of the band structure necessary to suppress thermalization by holes are
included. It is pointed out that the material should exhibit suitable gaps
between valence bands in addition to having suitable gaps between
conduction bands. The conditions that must be satisfied in order to prevent
thermalization by electrons as well as holes, a key feature necessary in
the production of ultrashort pulses, are formalized. Some examples of materials
approaching an "ideal" band structure are given
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