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We investigate fourth-order cascaded Raman shift in a birefringence ZrF4–BaF2–LaF3–AlF3–NaF (ZBLAN) fluoride fiber, which is the first demonstration of cascaded Raman shift in fluoride fibers. The pump source is a commercially available 1064nm picosecond fiber laser. At the average pump power of ∼7W, fourth-order cascaded Raman shift is observed if the pump pulse is polarized to the slow axis, and...
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