Abstract

Permanent structure of photoinduced singlemode waveguide in optical fluoride glasses was demonstrated using the self-channeled plasma filament excited by a femtosecond (110 fs) Ti:sapphire laser (<TEX>$λ_p$</TEX> = 800 nm). The photoinduced refractive index modification in ZBLAN glasses reached a length of approximately 10 - 15 mm from the input surface of the optical glass with the diameters ranging from 5 to 8 <TEX>${\mu}{\textrm}{m}$</TEX> at input intensities more than l.0 <TEX>${\times}$</TEX> <TEX>$10^{12}$</TEX> W/<TEX>$\textrm{cm}^2$</TEX>. The graded refractive index profiles were fabricated to be a symmetric form from the center of an optical fluoride glass and a maximum value of refractive index change (ㅿn) was measured to be l.3<TEX>${\times}$</TEX><TEX>$10^{-2}$</TEX>. The beam profile of the output beam transmitted through the modified region showed that the photoinduced refractive index modification produced a permanent structure of singlemode waveguide.

© 2003 Optical Society of Korea

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