Abstract
We obtained lasers based on the simultaneous-gain clad pump laser in a fluorotellurite fiber. Using a secondary suction method, we prepared a fluorotellurite double-clad preform with a Ho3+-doped core surrounded by a Tm3+-doped inner cladding, which we then drew into fibers. Tm3+ ions generate a 1.94 µm laser by pumping the inner cladding with a 1570 nm fiber laser. This is followed by further pumping of the Ho3+-doped core, and a 2.06 µm laser is obtained. Our results validate cladding simultaneous-gain feasibility of producing core lasers in a fluorotellurite fiber.
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