超広帯域ノイズスペクトル内での超低周波数ノイズを有するファイバブリルアンレーザー

The simultaneous suppression of both low- and high-frequency noise presents a critical challenge in the development of ultra-low-noise lasers. This work reports on a pump-locked, short-cavity fiber Brillouin laser that effectively addresses this issue by precisely controlling Brillouin gain detuning and cavity Q-factor. These parameters can be accurately determined and controlled by analyzing the profile of the fiber cavity mode spectrum. The optimized laser enhances slope efficiency to 90% and suppresses cascaded Brillouin scattering, enabling a 13.25 mW output power and an exceptionally low frequency noise level of 1 Hz²/Hz over a wide bandwidth (100 Hz-1 MHz). Furthermore, the pump-locking mechanism facilitates 110 MHz of continuous, mode-hop-free frequency scanning. This research establishes a robust, all-fiber platform for applications requiring ultra-low-noise laser sources.