Waveguides in BK7 optical glass fabricated by transverse electromigration of silver ions

Low-loss (0.1 dB/cm at 632.8 nm) waveguides fabricated in BK7 optical glass using the transverse electromigration of Ag/sup +/ ions are discussed. With a migration time of 1.5 h at 320 degrees C, waveguides of depths from 3.0 to 5.0 mu m were obtained with various index changes. The inverse WKB method was used to deduce the index profile. The profile was further confirmed by a comparison of experimental and theoretical mode indices and intensity distributions.<
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