2 μm Raman fiber laser based on a multimaterial chalcogenide microwire

摘要

We report a Raman fiber laser based on a multimaterial chalcogenide microwire. The microwire structure comprises a core of As_(38)Se_(62), a cladding of As_(38)S_(62), and a coating of poly-methyl meth-acrylate. The microwire is a robust, high confinement waveguide compatible with the mid-infrared. With the microwire inserted in a ring cavity, Raman laser oscillation at a wavelength of 2.025 μm occurs from synchronous pumping at a wavelength of 1.938 μm. The input peak power required to reach threshold is 4.6 W and the power slope efficiency is 4.5%. Numerical simulations are in good agreement with experimental results and predict chirp-free femtosecond pulses.