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Single-Frequency Microfiber Single-Knot Laser

A compact single-frequency microfiber laser was demonstrated in a single-knot Er3+/Yb3+ co-doped phosphate glass fiber ring with a diameter of 397.5 µm. The lasing wavelength is 1534.25 nm and the side-mode suppression ratio (SMSR) is higher than 27 dB. The linewidth is measured to be about 5 kHz and the relative intensity noise (RIN) is around -110 dB/Hz at frequencies over 50 kHz.