4 March 2016 High-power mid-infrared high repetition-rate supercontinuum source based on a chalcogenide step-index fiber
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Abstract
We demonstrate a tunable and robust femtosecond supercontinuum source with a maximum output power of 550 mW and a maximum spectral width of up to 2.0 μm which can cover the mid-infrared region from 2.3 μm up to 4.9 μm by tuning the pump wavelength. As light source we use a synchronously pumped fiber-feedback OPO and a subsequent OPA which delivers femtosecond, Watt level idler pulses tunable between 2.5 μm and 4.1 μm. These pulses are launched into As2S3 chalcogenide step-index fibers with core diameters of 7 and 9 μm. The spectral behavior of the supercontinuum is investigated by changing the pump wavelength, core diameter, fiber length, and pump power. Self-phase modulation is identified as the main broadening mechanism in the normal dispersion regime. This source promises to be an excellent laboratory tool for infrared spectroscopy owing to its high brilliance as demonstrated for the CS2- absorption bands around 3.5 μm.
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S. Kedenburg, S. Kedenburg, T. Steinle, T. Steinle, F. Mörz, F. Mörz, A. Steinmann, A. Steinmann, H. Giessen, H. Giessen, } "High-power mid-infrared high repetition-rate supercontinuum source based on a chalcogenide step-index fiber", Proc. SPIE 9731, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XV, 97310K (4 March 2016); doi: 10.1117/12.2209605; https://doi.org/10.1117/12.2209605
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