Open AccessDirect laser writing of thermally stabilized channel waveguides with Bragg gratings
Author(s) -
Hiroaki Nishiyama,
Isamu Miyamoto,
Shinichi Matsumoto,
Mitsunori Saito,
Kenji Kintaka,
Junji Nishii
Publication year - 2004
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.12.004589
Subject(s) - materials science , optics , fiber bragg grating , diffraction efficiency , grating , refractive index , laser , diffraction grating , wavelength , diffraction , excimer laser , annealing (glass) , optoelectronics , bragg's law , waveguide , physics , composite material
Thermally stabilized photo-induced channel waveguides with Bragg gratings were fabricated in Ge-B-SiO2 thin glass films by exposure with KrF excimer laser and successive annealing at 600 degrees C. The annealing reversed the photo-induced refractive index pattern and also enhanced its thermal stability. The stabilized channel waveguide with a Bragg grating showed diffraction efficiency of 18.0 dB and 18.7 dB for TE- and TM-like modes, respectively. The diffraction efficiencies and wavelengths for both modes never changed after heat treatment at 500 degrees C, whereas the conventional photo-induced grating decayed even at 200 degrees C.