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The effective Kerr nonlinearity of hollow-core kagome-style photonic crystalfiber (PCF) filled with argon gas increases over 100 times when the pressure isincreased from 1 to 150 bar, reaching 15 % of that of bulk silica glass, whilethe zero dispersion wavelength shifts from 300 to 900 nm. The group velocitydispersion of the system is uniquely pressure-tunable over a wide range whileavoiding Raman scattering : absent in noble gases and having an extremely highoptical damage threshold. As a result, detailed and well controlled studies ofnonlinear effects can be performed, in both normal and anomalous dispersionregimes, using only a fixed-frequency pump laser. For example, the absence ofRaman scattering permits clean observation, at high powers, of the interactionbetween a modulational instability side-band and a soliton created dispersivewave. Excellent agreement is obtained between numerical simulations andexperimental results. The system has great potential for the realisation ofreconfigurable supercontinuum sources, wavelength convertors and short-pulselaser systems.

High Pressure Gases in Hollow Core Photonic Crystal Fiber:A New Nonlinear Medium