Broadband supercontinuum generation in hollow-core photonic crystal fibers infiltrated with chloroform.

The chloroform-infiltrated square lattice photonic crystal fibers (PCFs) are designed with the difference of the air hole diameters in the cladding to improve chromatic dispersion and nonlinear properties. Based on numerical simulation results, two optimal structures with flat dispersion, high nonlinear coefficient, and small confinement loss are used for supercontinuum (SC) generation. The first fiber has an all-normal dispersion regime, a nonlinear coefficient of 486.355 W − 1 .km − 1 generating an SC spectrum of 640.3 nm within 30 dB levels at a pump wavelength of 0.945 μ m with peak power as low as 1.44 kW. With anomalous dispersion properties, the second fiber gives a very broad SC spectrum of 1471.8 nm within 30 dB levels at a 1.4 μ m pumping wavelength with a peak power of 20 kW. All-fiber SC sources operating with low-power pump lasers can use these fibers to effectively replace glass-core fibers. [ABSTRACT FROM AUTHOR]