Leaky-mode resonant gratings on a fibre facet |
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Authors: | Martin Vanek Jiri Ctyroky Pavel Honzatko |
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Institution: | 1.Institute of Photonics and Electronics, CAS,Prague,Czech Republic |
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Abstract: | Numerical investigation shows that an optimised leaky-mode resonant diffraction gratings fabricated in \({\mathrm{{Ta}}}_2{\mathrm{{O}}}_5\) layer deposited on the facet of an optical fibre can have a modal reflectance peak of more than 95%, 3 dB spectral bandwidth of about 50 nm and polarization extinction ratio of almost 18 dB. The grating is intended to be employed as a high-reflectance, wavelength- and polarization-dependent mirror in a fibre laser. We compare results of 2D and 3D modelling, investigate influence of grating parameters on spectral shape of modal reflectance and discuss fabrication tolerances. |
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