First- and second-order Bragg gratings in single-mode planarwaveguides of chalcogenide glasses |
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| Authors: | Saliminia A. Villeneuve A. Galstyan T.V. LaRochelle S. Richardson K. |
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| Affiliation: | Centre d'Opt., Photonique et Laser, Laval Univ., Que.; |
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| Abstract: | First- and second order Bragg reflectors at telecommunication wavelength (1.5 μm) were fabricated in single-mode monolayer (As2S3) and multilayer (AsSSe-AsS) chalcogenide glass (ChG) planar waveguides with near bandgap illumination using an interferometric technique. Reflectivities as high as 90% near 1555 nm, and index modulations up to 3×10-4 were achieved. The volume photodarkening effect is the principal mechanism involved in the formation of the Bragg gratings |
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