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We present first all-fiber unidirectional ring thulium-doped laser, based on isolator-free theta cavity configuration and fiber Bragg mirror as filtering element. Laser provides 1W output power with 30% slope efficiency, and linewidth of about 0.2nm.
Yves Bellouard, Victor Carle Adrien Boureau, Ruben Ricca
Romain Christophe Rémy Fleury, Janez Rus