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arXiv · 1905.05602

Chalcogenide-glass polarization-maintaining photonic crystal fiber for mid-infrared supercontinuum generation

A. N. Ghosh·M. Meneghetti·C. R. Petersen·O. Bang·L. Brilland·S. Venck·J. Troles·J. M. Dudley·T. Sylvestre
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Abstract

In this paper, we report the design and fabrication of a highly birefringent polarization-maintaining photonic crystal fiber (PM-PCF) made from chalcogenide glass, and its application to linearly-polarized supercontinuum (SC) generation in the mid-infrared region. The PM fiber was drawn using the casting method from As38Se62 glass which features a transmission window from 2 to 10 $μm$ and a high nonlinear index of 1.13.10$^{-17}$m$^{2}$W$^{-1}$. It has a zero-dispersion wavelength around 4.5 $μm$ and, at this wavelength, a large birefringence of 6.10$^{-4}$ and consequently strong polarization maintaining properties are expected. Using this fiber, we experimentally demonstrate supercontinuum generation spanning from 3.1-6.02 $μm$ and 3.33-5.78 $μm$ using femtosecond pumping at 4 $μm$ and 4.53 $μm$, respectively. We further investigate the supercontinuum bandwidth versus the input pump polarization angle and we show very good agreement with numerical simulations of the two-polarization model based on two coupled generalized nonlinear Schrödinger equations.

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A. N. Ghosh, M. Meneghetti, C. R. Petersen, O. Bang, L. Brilland, S. Venck, J. Troles, J. M. Dudley, T. Sylvestre. 2019-05-14. Chalcogenide-glass polarization-maintaining photonic crystal fiber for mid-infrared supercontinuum generation. https://arxiv.org/abs/1905.05602

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