Abstract
ABSTRACTHigh-index-core (HIC) Bragg fibres have large potential to realize the highly coherent mid-infrared (MIR) supercontinuum generation. The propagation characteristics of HIC Bragg fibre have been analysed using the transfer matrix method and full-vector modal method. We design the HIC Bragg fibre with flat chromatic dispersion and small effective mode diameter in the MIR region and investigate MIR supercontinuum generation. The relationship of fibre length, and pump wavelength on the spectral bandwidth from the fibre was studied. The ultra-flattened dispersion profile was obtained by varying the diameters of the fibre core and cladding thickness. It is numerically demonstrated that the MIR supercontinuum extending from 0.5 to 5.6 µm in the HIC Bragg fibre can be generated by pumping with hyperbolic secant pulse at 1.064 µm, the peak power of 2 kW, and the full width at half maximum of 100 fs.
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