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Bragg gratings photoinduced in ZBLAN fibers by femtosecond pulses at 800 nm

by: M. Bernier, D. Faucher, R. Vallée, A. Saliminia, G. Androz, Y. Sheng, S. L. Chin
Opt. Lett., Vol. 32, No. 5. (1 March 2007), pp. 454-456, doi:10.1364/ol.32.000454  Key: citeulike:11957688

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Abstract

Fiber Bragg gratings were written in thulium-doped and undoped single-mode ZBLAN fibers by focusing femtosecond laser pulses on the fiber core through a phase mask. Maximum index modulation of the order of 1×10−3 was induced in both types of fibers. Measurements of the transverse refractive index changes across the core and cladding regions indicate that the grating formation originates from a negative index change.


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