Zhang Yang, Ye Jun, Xu Jiangming, Song Jiaxin, Yao Tianfu, Zhou Pu
Opt Express. 2020 Mar 30;28(7):10515-10523. doi: 10.1364/OE.390796.
Owing to the special power distribution property, a random distributed feedback Raman fiber laser can achieve a high power spectrally flexible output with a low power spectrally tuning device. Here, an all-fiberized linearly polarized dual-wavelength random distributed feedback Raman laser with wavelength, linewidth, and power ratio tunability is demonstrated. By adopting two watt-level bandwidth adjustable optical filters, a spectrum-manipulable dual-wavelength output with nearly a 10 W output power is achieved. The wavelength separation can be tuned from 2.5 to 13 nm, and the 3 dB linewidth of the output can be doubled by increasing the bandwidth of the optical filter. The power ratio of each laser line can be tuned from 0 to nearly 100% with the help of two variable optical attenuators. A maximum output power of 9.46 W is realized, with a polarization extinction ratio up to 20.5 dB. The proposed dual-wavelength fiber laser can be employed as a pump source in frequency tunable, bandwidth adjustable terahertz microwave generation, and mid-infrared optical parametric oscillators.
由于其特殊的功率分布特性，随机分布反馈拉曼光纤激光器可以通过一个低功率光谱调谐装置实现高功率光谱灵活输出。在此，展示了一种具有波长、线宽和功率比可调谐性的全光纤化线性偏振双波长随机分布反馈拉曼激光器。通过采用两个瓦级带宽可调光滤波器，实现了具有近10W输出功率的可光谱操控双波长输出。波长间隔可在2.5至13nm范围内调谐，并且通过增加光滤波器的带宽可使输出的3dB线宽加倍。借助两个可变光衰减器，每条激光线的功率比可在0至近100%范围内调谐。实现了9.46W的最大输出功率，偏振消光比高达20.5dB。所提出的双波长光纤激光器可作为频率可调谐、带宽可调节太赫兹微波产生以及中红外光学参量振荡器中的泵浦源。
