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Schematic diagram of the experimental L-band linear-cavity fiber laser setup; (a) pump laser; (b) wavelength-division multiplexer; (c) erbium-doped fiber; (d) fiber optic circulator; (e) optical coupler; (f) optical spectrum analyzer; (g) high-precision rotation mount where the MMF-RFG was rotated; (h) photograph of the inscribed MMF-RFG located into a syringe.
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