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A Compact Linearly Polarized Low-Noise Single-Frequency Fiber Laser at 1064 nm

A compact 1064 nm linearly polarized low-noise single-frequency fiber laser has been demonstrated. An over 200 mW stable polarization-maintaining (PM) single-longitudinal-mode laser was achieved from an 8-mm-long custom-built non-PM Yb3+-doped phosphate fiber. The linear polarization extinction ratio (LPER) is larger than 30 dB. The measured relative intensity noise (RIN) is less than -125 dB/Hz at frequencies over 700 kHz. The linewidth of the fiber laser is estimated to be less than 2 kHz.