Tunable Single-Longitudinal-Mode High-Power Fiber Laser

Abstract EN

We report a novel CW tunable high-power single-longitudinal-mode fiber laser with a linewidth of ∼9 MHz.

A tunable fiber Bragg grating provided wavelength selection over a 10 nm range.

An all-fiber Fabry-Perot filter was used to increase the longitudinal mode spacing of the laser cavity.

An unpumped polarization-maintaining erbium-doped fiber was used inside the cavity to eliminate mode hopping and increase stability.

A maximum output power of 300 mW was produced while maintaining single-longitudinal-mode operation.