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Proceedings Paper

Annealing of gratings photowritten in tin-codoped germanosilicate preform plates and fibers
Author(s): Marc Douay; Wenxiang Xie; Pascal Bernage; David Pureur; Pierre Niay; Bertrand Poumellec; Liang Dong
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Paper Abstract

Bragg gratings were written in the cores of tin codoped germanosilicate preform plates through exposure to cw UV light (244 nm). The experiments were performed using unloaded and H2 loaded samples. The diffraction efficiencies of the holograms were measured at a probe wavelength of 633 nm. The photoinduced refractive index modulations were calculated from these data. Microscopic inspections of the plate surfaces have shown that UV exposure induced corrugations at the grating places. A phase shift interferometric microscope was used to measure the depths of the corrugations. Afterwards, both the refractive index modulations and the depths of the corrugations were measured in the course of 30 min isochronal step annealing experiments. The heating induced refractive index modulation changes were calculated from the changes in the corrugation depths by means of a strain densification model and then compared to the experimental ones. The results are compared to the ones obtained from fibers drawn from these preforms.

Paper Details

Date Published: 23 January 1997
PDF: 11 pages
Proc. SPIE 2998, Photosensitive Optical Materials and Devices, (23 January 1997); doi: 10.1117/12.264169
Show Author Affiliations
Marc Douay, Univ. des Sciences et Technologie de Lille (France)
Wenxiang Xie, Univ. des Sciences et Technologie de Lille (France)
Pascal Bernage, Univ. des Sciences et Technologie de Lille (France)
David Pureur, Univ. des Sciences et Technologie de Lille (France)
Pierre Niay, Univ. des Sciences et Technologie de Lille (France)
Bertrand Poumellec, Univ. de Paris-Sud (France)
Liang Dong, Univ. of Southampton (United Kingdom)


Published in SPIE Proceedings Vol. 2998:
Photosensitive Optical Materials and Devices
Mark P. Andrews, Editor(s)

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