100 W-class kilohertz-linewidth single-frequency fiber laser at 922 nm

Here, we report a high-power kilohertz-linewidth all-fiber SFFL at 922 nm with a 103 W output power and an optical-to-optical efficiency of 24.8% while preserving a 31 dB suppression of competing 1.06 mm emission, employing the homemade polarization maintaining 20/125 mm Nd-doped silica fiber (NDF), which to the best of our knowledge is the first demonstration of 100 W-class SFFL in at this band.

These results indicate that this NDF could support power scaling of Nd-doped SFFL at 0.9 mm and such high-power SFFL source may find potential applications in nonlinear frequency conversion, laser cooling of atoms and underwater communication.