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Output spectra of the linear-cavity fiber laser with a MMF-RFG reflector pumped by a 976-nm laser, when (a) a single wavelength lasing centered at 1574.75 nm, (b) a dual wavelength lasing centered at 1574.75 nm and 1575.75 nm, and (c) a single wavelength lasing centered at 1575.5 nm are obtained. (d) Electric beat with a tunable laser source (TLS) of the single-wavelength lasing emission when pumped at 300 mW.
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