Abstract
The guiding mechanisms of both photonic bandgap and inhibited coupling hollow-core photonic crystal fibers (HC-PCFs) are discussed, a special attention being paid to kagome HC-PCFs. The propagation of light in kagome HC-PCFs filled with different noble gases is described. The dependence of some properties, namely the group velocity dispersion and the nonlinear parameter on the gas pressure, is discussed. In the case of the kagome HC-PCF filled with xenon, it is shown that the zero-dispersion wavelength shifts from 693 to 1973nm when the pressure is increased from 1 to 150bar, while the effective Kerr nonlinearity becomes comparable to that of silica. A generalized Schrödinger equation is used to describe ultrashort pulse propagation in a gas-filled kagome PCF. A generalized Schrödinger equation is used to simulate the propagation of femtosecond pulses and the generation of supercontinuum and UV light in kagome HC-PCFs filled with noble gases. It is shown that an ultrafast, tunable, and coherent UV light source can be constructed using a kagome HC-PCF filled with helium.
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