Switchable dual-wavelength Q-switched and mode-locked fiber lasers using a large-angle tilted fiber grating.
Switchable dual-wavelength Q-switched and mode-locked fiber lasers using a large-angle tilted fiber grating.
复制标题
DOI：
10.1364/oe.23.001353
复制
发表时间：
2015-01
期刊：
影响因子：
3.8
通讯作者：
Zuxing Zhang;C. Mou;Zhijun Yan;Yongjin Wang;K. Zhou;Lin Zhang
中科院分区：
文献类型：
--
作者：
Zuxing Zhang;C. Mou;Zhijun Yan;Yongjin Wang;K. Zhou;Lin Zhang
首次提出并实现了利用大角度倾斜光纤光栅实现脉冲光纤激光器的调Q和锁模。利用大角度倾斜光纤光栅（LA-TFG）独特的偏振特性，即偏振相关损耗和偏振模分裂，分别在短腔和长腔中实现了可切换的双波长调Q和锁模脉冲。对于锁模情况，由于峰值功率箝位效应，激光器处于纳秒矩形脉冲下工作。随着泵浦功率的增加，单波长和双波长矩形脉冲的持续时间都增加。还发现，通过采用可调谐带通滤波器，双波长矩形脉冲的每个滤波波长对应于单个纳秒矩形脉冲。
We proposed and demonstrated pulsed fiber lasers Q-switched and mode-locked by using a large-angle tilted fiber grating, for the first time to our best knowledge. Owing to the unique polarization properties of the large-angle tilted fiber grating (LA-TFG), i.e. polarization-dependent loss and polarization-mode splitting, switchable dual-wavelength Q-switched and mode-locked pulses have been achieved with short and long cavities, respectively. For the mode-locking case, the laser was under the operation of nanosecond rectangular pulses, due to the peak-power clamping effect. With the increasing pump power, the durations of both single- and dual-wavelength rectangular pulses increase. It was also found that each filtered wavelength of the dual-wavelength rectangular pulse corresponds to an individual nanosecond rectangular pulse by employing a tunable bandpass filter.