Hundred-Watt-Level, Linearly Polarized Multi- Wavelength Fiber Oscillator With Wavelength, Interval, and Intensity Tunability

Abstract

Multi-wavelength fiber lasers with special spectral reconfigurable and polarization characteristic are widely applied in nonlinear frequency conversion, spectroscopy, and fiber sensing. In this manuscript, we demonstrate a hundred-watt-level, linearly polarized multi-wavelength fiber oscillator with wavelength, interval and intensity tunability. A watt-level acoustic-optic tunable filter is adopted in a ring cavity to realize wavelength selection. Maximum output power up to 90.0 W has been achieved with average polarization extinction ratio of 21.5 dB. The central wavelength tuning range is 1035∼1085 nm and the channel number is controllable from 1 to 5. The wavelength interval can be tuned from 4 to 40 nm and the intensity of each channel can be adjusted independently. Moreover, we investigate the wavelength competition balancing ability of the acoustic-optic tunable filter experimentally and theoretically, which may give a reference for further high-power spectral manipulation. To the best of our knowledge, this is the highest output power ever reported for multi-wavelength fiber laser, meanwhile it exhibits impressive polarization characteristic. Benefiting from its flexible spectral manipulability, the proposed multi-wavelength fiber oscillator has great potential in various applications.