SINGLE-PULSE WRITING AND VISUALIZATION OF TYPE II FIBER BRAGG GRATINGS
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The article presents the results of single-pulse writing of type II fiber Bragg gratings in birefringent optical fiber with elliptical stress cladding by a single KrF excimer laser pulse. Gratings diffraction efficiency induced by a single pulse exceeds 99.9% with a full-width at half maximum about 1 nm. Images of type II fiber Bragg gratings using differential interference contrast method and bright-field microscopy are obtained.