Stimulated Raman scattering (SRS) is a nonlinear effect in the media which can transfer a fraction of power from one optical field to another and whose frequency is downshifted by an amount determined by the vibrational modes of the medium [1, 2]. When Raman gain of the optical fiber is high and pump power into it is sufficient, cascaded SRS effect can be achieved [3, 4]. In this paper, a low-loss chalcogenide optical fiber was designed and fabricated based on AS-S glass, and a 16 m long fiber was experimentally used to enhance Raman gain for boosting cascaded SRS generation. A nanosecond laser at ~1545 nm was used as the pump source and mid-infrared cascaded SRS up to eight orders was observed.
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