Abstract
Classical expression for the propagation constant and absorption coefficient derived by Narcatilli and Schmeltzer for hollow-core fiber (HCF) has been slightly modified to account for noble gas material dispersion at high gas pressure. As a proof of concept, the nonlinear refractive index of xenon (Xe) gas has been investigated by numerically fitting to experimentally obtained spectral broadening in HCF under intense high repetition rate pulses. By varying the Xe pressure inside the HCF, a pressure-dependent nonlinear refractive index value of κ2=(50.1±0.3)×10-20 cm2/W atm at 1.03μm is obtained, which compares favorably with literature reported values. Finally, temporal compression of 50μJ, 320fs pulses at 0.6MHz repetition rate to 61fs with 0.29GW peak power in a HCF filled with 5 bars of Xe gas has been demonstrated using a single HCF compression stage.
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