Pulse propagation in hollow-core fiber at high-pressure regime: application to compression of tens of μJ pulses and determination of nonlinear refractive index of xenon at 1.03  μm

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 (...

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Bibliographic Details
Published in:Applied optics (2004) 2018-06, Vol.57 (16), p.4659
Main Authors: Lo, Shu-Zee Alencious, Wang, Lin, Loh, Zhi-Heng
Format: Article
Language:English
Subjects:
Absorptivity
Gas pressure
Pressure dependence
Pulse propagation
Rare gases
Refractivity
Repetition
Xenon
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Summary: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 κ =(50.1±0.3)×10   cm /W atm at 1.03 μm is obtained, which compares favorably with literature reported values. Finally, temporal compression of 50 μJ, 320 fs pulses at 0.6 MHz repetition rate to 61 fs with 0.29 GW peak power in a HCF filled with 5 bars of Xe gas has been demonstrated using a single HCF compression stage.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.57.004659