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We experimentally and numerically investigate flat supercontinuum generationin gas-filled anti-resonant guiding hollow-core photonic crystal fiber. Bycomparing results obtained with either argon or nitrogen we determine the roleof the rotational Raman response on the supercontinuum formation. When usingargon, a supercontinuum extending from 350 nm to 2 {\mu}m is generated throughmodulational instability. Although argon and nitrogen exhibit similar Kerrnonlinearity and dispersion, we find that the energy density of the continuumin the normal dispersion region is significantly lower when using nitrogen.Using numerical simulations, we find that due to the closely spaced rotationallines in nitrogen, gain suppression in the fundamental mode causes part of thepump pulse to be coupled into higher-order modes which reduces the energytransfer to wavelengths shorter than the pump.

The effect of rotational Raman response on ultra-flat supercontinuum generation in gas-filled hollow-core photonic crystal fibers