Radial-GRIN rod lenses of titanium doped silica have been prepared by a solgel process using metal alkoxides. The obtained rods with parabolic index distribution give high efficiency in coupling with optical fibers as well as good image resolution. Moreover they exhibit good stability in an adverse environment such as high temperature, high humidity, and strong radiation.
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Shingyouchi et al. (1990) studied this question.
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