可调双频光纤环形腔激光器

Tunable Dual-Frequency Er-Doped Fiber Ring Laser

提出了一种新型双波长掺铒光纤环形腔激光器。使用可调滤波器改变两束激光的波长差,采用由窄带滤波器和Mach-Zehnder梳状滤波器组成的多重滤波的方式来选择工作频率或者工作模式,有效地抑制相邻纵模之间的跳模现象。利用偏振烧孔效应和激光反向传播的特点大大增强了增益介质的非均匀加宽特性。实验结果表明,得到的单频单纵模双波长激光器的波长间隔可调谐范围为0.019～15 nm;两束激光的拍频信号的频率差调节至472.5 MHz时,在100 Hz～3 GHz范围内只有一个拍频信号。

A new dual-wavelength erbium-doped fiber ring laser is proposed. By using multi-filtering method to select working frenquencies or modes, the mode hopping between the neighboring modes can be effectively suppressed. Simultaneity by using the polarization hole burning effect, incorporating with the contrary propagation of the two light beams, the inhomogeneous broadening is significantly increased in the gain medium, and thus a stable dual-wavelength Er-doped fiber ring laser operating in single-longitudinal mode and single-frequency was demonstrated. Wavelength spacing between the two wavelengths was tunable from 0.019 nm to 15 nm. By suitable adjusting the tunable fiber filter, its intensity was of 25 dB over the noise and only one beat tone at 472.5 MHz was found in the spectral rang from 100 Hz to 3 GHz.