%A Jinmei Yao(姚金妹), Bin Zhang(张斌), Jing Hou(侯静) %T Monolithic all-fiber mid-infrared supercontinuum source based on a step-index two-mode As2S3 fiber %0 Journal Article %D 2019 %J Chin. Phys. B %R 10.1088/1674-1056/28/6/064205 %P 64205-064205 %V 28 %N 6 %U {https://cpb.iphy.ac.cn/CN/abstract/article_121652.shtml} %8 2019-06-05 %X

We demonstrate efficient supercontinuum generation extending into mid-infrared spectral range by pumping a two-mode As2S3 fiber in the normal dispersion regime. The As2S3 fiber is fusion spliced to the pigtail of a near-infrared supercontinuum pump source with ultra-low splicing loss of 0.125 dB, which enables a monolithic all-fiber mid-infrared supercontinuum source. By two-mode excitation and mixed-mode cascaded stimulated Raman scattering, a supercontinuum spanning from 1.8 μm to 4.2 μm is obtained. Over 70% of the supercontinuum power is converted to wavelengths beyond 2.4 μm. This is the first experimental report with respect to the multimode mid-infrared supercontinuum generation in a step-index two-mode chalcogenide fiber.