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Abstract
A linearly polarized low-noise single-frequency fiber laser was demonstrated by using a homemade 1.2-cm-long Yb:YAG crystal derived silica fiber. A maximum output power of greater than 60 mW was obtained with a signal-to-noise ratio of ${\sim}{80}\;{\rm dB}$ and a polarization extinction ratio of 27.8 dB. Additionally, the relative intensity noise was measured to be ${-}{145}\;{{\rm dB}/{\rm Hz}}$ above 6.5 MHz. A frequency fluctuation of less than 20 MHz was also obtained. The output power was scaled up to 14.5 W with a one-stage all-fiber amplifier scheme with a slope efficiency of 56.4%.
© 2020 Optical Society of America
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