Measuring high-order Kerr effects of noble gases based on spectral analysis

A method for measuring high-order Kerr effects of noble gases is proposed. It is based on analyzing spectral characteristics of the optical pulse after propagation through a hollow-core fiber which is filled with noble gas whose Kerr effects are to be measured. This method is further investigated through numerical experiments, and the retrieved Kerr refractive indexes agree well with the coefficients used in the model simulating the propagation dynamics. This method uses single beam geometry which is easy to implement and avoids the spurious interfering effects in multi-beam methods originally used for measuring these effects.