Wang Xiaoliang, Chen Daru, Li Haitao, She Lijuan, Wu Qiong
Appl Opt. 2018 Jan 10;57(2):258-262. doi: 10.1364/AO.57.000258.
The random fiber laser (RFL), which is a milestone in laser physics and nonlinear optics, has attracted considerable attention recently. Most previously reported RFLs are based on distributed feedback of Rayleigh scattering amplified through the stimulated Raman-Brillouin scattering effect in single-mode fibers, which require long-distance (tens of kilometers) single-mode fibers and high threshold, up to watt level, due to the extremely small Rayleigh scattering coefficient of the fiber. We proposed and demonstrated a half-open-cavity RFL based on a segment of an artificially controlled backscattering single-mode fiber with a length of 210 m, 310 m, or 390 m. A fiber Bragg grating with a central wavelength of 1530 nm and a segment of artificially controlled backscattering single-mode fiber fabricated by using a femtosecond laser form the half-open cavity. The proposed RFL achieves thresholds of 25 mW, 30 mW, and 30 mW, respectively. Random lasing at a wavelength of 1530 nm and extinction ratio of 50 dB is achieved when a segment of 5 m erbium-doped fiber is pumped by a 980 nm laser diode in the RFL. A novel RFL with many short cavities has been achieved with low threshold.
随机光纤激光器（RFL）是激光物理学和非线性光学领域的一个里程碑，近年来受到了广泛关注。此前报道的大多数随机光纤激光器基于单模光纤中受激拉曼 - 布里渊散射效应放大的瑞利散射的分布反馈，由于光纤的瑞利散射系数极小，这需要长距离（数十公里）的单模光纤且阈值很高，可达瓦级。我们提出并演示了一种基于长度为210米、310米或390米的人工控制背向散射单模光纤段的半开腔随机光纤激光器。中心波长为1530纳米的光纤布拉格光栅和用飞秒激光制造的一段人工控制背向散射单模光纤形成半开腔。所提出的随机光纤激光器的阈值分别为25毫瓦、30毫瓦和30毫瓦。当在随机光纤激光器中用980纳米激光二极管泵浦一段5米长的掺铒光纤时，可实现波长为1530纳米、消光比为50分贝的随机激光振荡。已实现了一种具有许多短腔且阈值低的新型随机光纤激光器。
