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Bragg grating writing through the polyimide coating of high NA optical fibres with femtosecond IR radiation |
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| Authors: | Stephen J Mihailov Dan Grobnic Robert B Walker Christopher W Smelser Gino Cuglietta Tom Graver Alexis Mendez |
| Institution: | aCommunications Research Centre Canada, 3701 Carling Avenue, Ottawa, Ontario, Canada K2H 8S2;bMicron Optics, Inc., 1852 Century Place NE, Atlanta, GA 30345, United States;cMCH Engineering, LLC, 1728 Clinton Avenue, Alameda, CA 94501, United States |
| Abstract: | Bragg gratings are written with ultrafast 800 nm radiation and a phase mask through the polyimide polymer coatings of commercially available high NA fibres that are both unloaded and loaded with high pressure hydrogen gas. For polyimide coated fibres with very high germanium core concentrations, index modulations greater than 1 × 10−4 are induced. Stable core index modulations  60% of their original value were present after 115 h at 500 °C. |
| Keywords: | Fibre Bragg gratings Photosensitivity Fibre optics sensors Ultrafast processes in fibres |
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