title: Thermal hypersensitisation and grating evolution in Ge-doped optical fibre.
abstract: Low temperature (sub 1000 degrees C) thermal hypersensitisation is reported in germanosilicate optical waveguides. Gratings are written using a CW 266nm laser source. In contrast to laser hypersensitisation, thermal excitation is generally dispersive involving a range of specific glass sites. More complex grating profiles presenting evidence of solid-state autocatalysis and bistability at increasingly high sensitisation temperatures are observed. More specifically, at 500 degrees C, a behaviour resembling type IIA grating response is observed.
authors.forename: H
authors.initials: H
authors.lastname: Sørensen
authors.forename: J
authors.initials: J
authors.lastname: Canning
authors.forename: M
authors.initials: M
authors.lastname: Kristensen