Abnormal shift of center wavelength in annealing long-period gratings

Citation
L. Qin et al., Abnormal shift of center wavelength in annealing long-period gratings, CHIN PHYS L, 17(1), 2000, pp. 28-30
Citations number
8
Categorie Soggetti
Physics
Journal title
CHINESE PHYSICS LETTERS
ISSN journal
0256307X → ACNP
Volume
17
Issue
1
Year of publication
2000
Pages
28 - 30
Database
ISI
SICI code
0256-307X(2000)17:1<28:ASOCWI>2.0.ZU;2-G
Abstract
During annealing process of long-period gratings, the center wavelengths of some modes shift to red wavelength while those of others shift to blue com pared with their original written ones, and the magnitudes of the shifts ar e related to the decay of the grating strength. The red shifts of center wa velength are more evident in lower-order modes of the gratings. We suggest that part of the photodissociated-H-2 combines continuously with Ge-defect centers within 2 h after UV-exposure, and with which the observed abnormal shifts can be explained successfully.