Abstract
The use of femtosecond pulse lasers for studying the photosensitivity mechanisms and inducing strong refractive index changes in bulk and fibre optical materials has attracted significant scientific interest during the last decade [1], Infrared and ultraviolet femtosecond radiation has been used for the inscription of Bragg or long period gratings in Ge-doped and all-silica optical fibres, with the refractive index changes induced being usually greater than 10−4, even for glasses of low transparency at the illumination wavelength. We have recently presented for first time the recording of Type IIA Bragg gratings in B-Ge codoped optical fibres using 248nm, 500fs laser radiation [2]. We extend our study here performing comparative exposures using the same laser wavelength and pulse durations of 5ps and 120fs.
© 2007 IEEE
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