Mid-infrared wavelength conversion using dispersion-engineered As2S5 microstructured optical fiber pumped with an ultrafast laser at 2 μm

We fabricate a dispersion-engineered As2S5 microstructured optical fiber for demonstration of frequency conversion in one of the atmospheric-transparent windows in the mid-infrared domain. The experimentally obtained results show that parametric wavelength conversion at 4.5 mu m is obtained using fabricated microstructured optical fiber pumped with 200 fs laser pulses of average power of 20 mW at 2 mu m. Obtained detuning frequency from the pump frequency was similar to 84 THz. To the best of our knowledge, the mid-infrared wavelength conversion at 4.5 mu m in fiber configuration has been demonstrated for the first time. The experimentally observed result matches well with numerically simulated phase-matching conditions. (C) 2020 Optical Society of America