15 April 1998 Traveling-wave single-mode Er-doped fiber laser
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An erbium-doped fiber ring laser, with a single- longitudinal-mode, operating at 1548.5 nm, has achieved traveling wave operation without the use of an optical isolator. The unidirectional operation is guaranteed by a combination of an output coupler and an external fiber Bragg grating. The laser can provide up to 19.6 mW output power. The linewidth of the laser was measured to be < 24 kHz.
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Li Wei, John W.Y. Lit, "Traveling-wave single-mode Er-doped fiber laser", Proc. SPIE 3280, Rare-Earth-Doped Devices II, (15 April 1998); doi: 10.1117/12.305395; https://doi.org/10.1117/12.305395

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