Abstract
We use liquid-filled capillary fibers with different core diameters to precisely characterize the nonlinear refractive index of the highly nonlinear liquids carbon disulfide, nitrobenzene, and toluene. We present measurements with two different femtosecond pump sources at wavelengths of 1032 and 1560 nm. The large nonlinearity of the liquids results from the retarded nonlinear optical response of the liquid molecules which includes a strong non-instantaneous contribution due to molecular reorientation. The nonlinear refractive index of the liquids is determined by fitting numerical simulations based on solving the generalized nonlinear Schrödinger equation including retarded response to the measured broadened output spectra. Our work is important for the novel field of near- and mid-IR supercontinuum generation in liquid-core optical fibers.
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Acknowledgments
The authors would like to thank M. Abdou Ahmed from the IFSW for valuable advice and calculating the mode field areas. This work has been supported financially by DFG, BMBF, GIF, ERC, BW-Stiftung, and Alexander von Humboldt Stiftung.
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Kedenburg, S., Steinmann, A., Hegenbarth, R. et al. Nonlinear refractive indices of nonlinear liquids: wavelength dependence and influence of retarded response. Appl. Phys. B 117, 803–816 (2014). https://doi.org/10.1007/s00340-014-5833-y
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DOI: https://doi.org/10.1007/s00340-014-5833-y