Li Yang, Lu Ping, Bao Xiaoyi, Ou Zhonghua
Opt Lett. 2014 Apr 15;39(8):2294-7. doi: 10.1364/OL.39.002294.
A tunable random feedback fiber laser with low intensity noise is proposed and experimentally demonstrated. The random feedback is effectively achieved by multiple reflections from 100 randomly spaced refractive index modulation regions over 10 cm SMF in both longitudinal and transverse directions. A tunable erbium-doped fiber ring laser with narrow linewidth of 2.4 kHz and a high side-mode suppression ratio of 59 dB is achieved over a 0.5 nm tuning range. The proposed fiber laser exhibits low relative intensity noise (<-120 dB/Hz) and low frequency fluctuation of ∼3.41×10(-11) over 5 s.
提出并通过实验证明了一种具有低强度噪声的可调谐随机反馈光纤激光器。通过在10 cm单模光纤中100个随机间隔的折射率调制区域在纵向和横向的多次反射有效地实现了随机反馈。在0.5 nm的调谐范围内实现了线宽为2.4 kHz且边模抑制比高达59 dB的可调谐掺铒光纤环形激光器。所提出的光纤激光器在5 s内表现出低相对强度噪声（<-120 dB/Hz）和约3.41×10(-11)的低频波动。
