论文信息 - Bragg gratings photoinduced in ZBLAN fibers by femtosecond pulses at 800 nm.

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

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 x 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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