Abstract
We report the use of nondegenerate four-wave mixing to write permanent refractive-index gratings in a Ce3+-doped (80 ppmw) aluminosilicate glass fiber at 300 K with one-photon excitation at 292 nm. After exposure for 30 min at an average power level of 13 mW at 300 K, a hole in the fiber transmission was observed at 808 nm, caused by the formation of a distributed feedback grating at this wavelength. The observed bandwidth of the grating was 0.18 nm, and the modulation depth of the transmission was 17%, from which the change in refractive index was calculated to be Δn = 2.5 × 10-5 at 808 nm. The photoinduced grating reflectivity monotonically decreased as the temperature was raised; the decrease in Δn from 300 to ≈640 K was less than 10%. Improvements are expected with increased Ce3+concentration or exposure. Very recently a refractive index change of 14 × 10-5 at 1060 nm was reported1 in a heavily doped silica fiber (11,700 ppm Ce3+), using single beam exposure at 266 nm in an interferometer configuration.
© 1991 Optical Society of America
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