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We demonstrate efficient compression of low-power 6 ps pulses down to 420 fs pedestal free pulses at 1.5 mum in an all-fiber scheme employing only 4 meters of As2Se3 fiber and a tailored chirped fiber Bragg grating.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
Group velocity reduction of sub-nanosecond optical pulses at 1.5 mum is experimentally demonstrated in superstructure Bragg gratings, including Moire and phase-shifted gratings, fabricated on photosensitive fibers by the continuous-writing technique.
Structural modification in gratings inscribed point-by-point by a femtosecond laser is investigated using quantitative phase microscopy. The gratings present a central region with a depressed refractive index surrounded by an outer corona with increased index.
A new technique to control the chromatic dispersion of a uniform fiber Bragg grating based on the symmetrical bending for the tunable pulse repetition-rate multiplication is proposed and experimentally demonstrated.
Using non-linear coupled-mode equations and a Bloch-wave approach, we show that the nonlinear propagation of femtosecond pulses and supercontinuum light inside fiber grating can be modeled by nonlinear Schrodinger equation with modified dispersion profile.
We report on the realization of FBGs in a standard Er-doped fiber written into the non-photosensitive core by femtosecond laser pulses. Efficient laser operation is demonstrated using this technique.
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