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Results on the inscription of Type IIA Bragg gratings in B-germanosilicate fibres using 248 nm, 500 fs laser radiation are presented. The gratings recorded exhibit index changes Deltan ap 10-3, while they remain intact for temperatures up to 650degC.
We change the pitch of interferometrically written 1-dimensional periodic structures by adjusting the frequency shift between two interfering beams. This technique is applicable to fabrication of both planar and fiber Bragg gratings.
We demonstrate the formation of long period gratings in fluid-filled photonic bandgap fiber (PBGF). The unique modal properties of PBGFs allow for coupling to LP11-like modes at multiple wavelengths. We obtain good agreement with simulations.
We report on the use of a photonic bandgap fiber for dispersion management of similaritons. The possibility of an all-fiber similariton laser is discussed by comparing the experimental results to a grating compressor.
We derive an approximate solution to the nonlinear Schrodinger equation which includes the effects of fiber gratings or other narrow-band spectral features. Our approach allows rapid estimation of grating enhancements from a single waveguide-only simulation.
The spectral response of fiber Bragg gratings written with an ultrafast IR laser source is shown to be intensity dependent. This result suggests a different grating profile as a function of intensity.
The photo-thermal effect describes the absorption of light and a change in grating characteristics via dn/dT, which can mask fast non-linear optical effects. The effect is characterized and a method to reduce it is demonstrated.
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