Open AccessMid-infrared supercontinuum generation in step-index As_2S_3 fibers pumped by a nanosecond shortwave-infrared supercontinuum pump source
Author(s) -
Jinmei Yao,
Bin Zhang,
Ke Yin,
Linyong Yang,
Jing Hou,
Qin Lu
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.015093
Subject(s) - supercontinuum , optics , materials science , nanosecond , dispersion (optics) , infrared , fiber , raman scattering , optoelectronics , wavelength , photonic crystal fiber , raman spectroscopy , laser , physics , composite material
A supercontinuum (SC) source spanning from 2 to 4 μm is demonstrated in As 2 S 3 -chalcogenide fibers pumped by a nanosecond supercontinuum pump source in the normal dispersion region. In this experiment, two pieces of 3-m-long step-index As 2 S 3 fiber with different core diameters of 7 μm and 9 μm are pumped by a 1.9-2.5 μm nanosecond supercontinuum source. The zero dispersion wavelengths are both beyond 6.6 μm, thus cascaded stimulated Raman scattering is believed to be the dominant mechanism responsible for spectral broadening. With a low peak pump power of ~2.9 kW, both of the output spectra have extended to 4 μm with enhanced power distribution in the MIR region. The maximum output power of the mid-infrared supercontinua is ~140 mW. To the best of our knowledge, it is the first supercontinuum extenting to 4 μm in an As 2 S 3 fiber pumped by shortwave-infrared SC pluses in the normal dispersion region.