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A tunable dual-wavelength thulium doped fiber laser is demonstrated experimentally. For the first time for the 2-$\mu \text{m}$ wavelength band we propose the independent tuning of the generated laser lines based on fiber Bragg gratings and the use of a Hi-Bi fiber optic loop mirror for the fine adjustment of the cavity losses to obtain stable dual-wavelength operation. Dual-wavelength laser generation...
An experimental analysis for the use of a Sagnac interferometer with high birefringence fiber in the loop as generated laser wavelength tuning device in a ring cavity Erbium-doped fiber laser in continuous wave and pulsed actively Q-switched regimes is presented. The maximal tuning range of ∼26.72 nm depends on the Sagnac interferometer wavelength spectrum period of ∼30.32 nm. The wavelength tuning...
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