Open AccessThermal hypersensitisation and grating evolution in Ge-doped optical fibre
Author(s) -
Henrik Rokkjær Sørensen,
John Canning,
Martin Kristensen
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.002276
Subject(s) - grating , optics , materials science , thermal , laser , diffraction grating , doping , optoelectronics , bistability , excitation , physics , quantum mechanics , meteorology
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.