Over 30 W single-mode kilohertz-linewidth single-frequency all-fiber laser at 910 nm

Power scaling of neodymium (Nd)-doped single-frequency fiber lasers (SFFLs) operating at ~900 nm has been fundamentally constrained by dominant ~1060 nm emission, with previous demonstrations limited to below 3 W. Here, we demonstrate a 910 nm single-mode Nd-doped SFFL system that achieves a record over 30 W output power employing homemade Nd-doped silica fiber (NDF), while preserving exceptional 49 dB suppression of competing ~1060 nm emission.The laser system originates from a distributed Bragg reflector (DBR) single frequency (SF) oscillator with 11 mW output power, which is subsequently amplified to 31.1 W through three polarizationmaintaining (PM) amplification stages utilizing PM 10/125 m NDF.To the best of our knowledge, this represents the highest power achieved for Nd-doped SFFLs in this spectral region.The output exhibits excellent beam quality (Mx=1.03,My=1.05) and narrow linewidth (10.2 kHz).These results validate that the homemade PM 10/125 m NDF can be employed in intermediate and main amplifier in all-fiber SF master oscillator power amplifier (MOPA) system at ~900 nm.