Tunable Narrow-Linewidth Fiber Laser Based on Light-Controlled Graphene

Parameter regulations of narrow-linewidth lasers in the frequency domain have attracted considerable attention for wide spread applications in precise coherent detection, generation of microwaves, and light quantum computing areas. The light-controllable methods assisted by novel two-dimensional materials pave precise access toward wavelength-tunable lasers with high stability and excellent linearity. In this paper, we propose a light-enabled tunable narrow-linewidth fiber laser based on a stable graphene-coated filter with a dynamical tuning speed of more than ~700 MHz/ms and a tuning resolution less than 300 MHz. Owing to a single longitudinal mode operation with the narrow-linewidth property of the stimulated Brillouin laser oscillation, the fiber laser with output linewidths as low as ~750 Hz is obtained. The lasing wavelength can be linearly tuned with a slope of 13.2 pm/mW and a linear fitting R
²
of 0.99897 by adjusting the controlling light power, and the tuning performance owns excellent reversibility during the whole round-trip process.