Abstract
A wavelength tunable narrow linewidth microfiber laser is demonstrated. The oscillating emission of the microfiber laser is provided by a double-knot with a cavity length around 1.75 mm, which is fabricated by using a homemade Er3+/Yb3+ co-doped phosphate glass fiber. The diameters of the two knots are 206 and 351 μm respectively, while the diameter of the microfiber is about 1.88 μm. Based on this compact structure, a 2 kHz linewidth single frequency laser is realized with a wavelength tuning range larger than 18 nm. The side-mode-suppression ratio is higher than 38 dB, and the relative intensity noise (RIN) is measured to be −110 dB Hz−1 at frequencies of over 50 kHz.
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