调Q和调Q锁模脉冲共存双波长光纤激光器  

Coexistence of Q-switched and Q-switched mode-locking pulse dual-wavelength fiber laser

作　　者：明淑娴 魏志伟 刘萌[1,2] 罗爱平[1,2] 徐文成[1,2] 罗智超[1,2] Ming Shuxian;Wei Zhiwei;Liu Meng;Luo Aiping;Xu Wencheng;Luo Zhichao(Guangzhou Key Laboratory for Special Fiber Photonic Devices and Applications,South China Normal University,Guangzhou 510006,China;Guangdong Provincial Engineering Technology Research Center for Microstructured Functional Fibers and Devices,South China Normal University,Guangzhou 510006,China)

机构地区：[1]华南师范大学广州市特种光纤光子器件与应用重点实验室,广东广州510006 [2]华南师范大学广东省微结构功能光纤与器件工程技术研究中心,广东广州510006

出　　处：《红外与激光工程》2019年第8期69-76,共8页Infrared and Laser Engineering

基　　金：国家自然科学基金(61805084,11874018,61875058,11474109);广东省自然科学基金杰出青年基金(2014A030306019);广东省科技创新青年拔尖人才(2014TQ01X220);广东省高等学校优秀青年教师培养计划(YQ2015051);广东省科技项目(2016B090925004);广东高校青年创新人才项目(2017KQNCX051);广州市科技计划项目(201607010245);华南师范大学青年教师科研培育基金(17KJ09);广东省光纤激光材料与应用技术重点实验室开放基金(2019-2)

摘　　要：为了使光纤激光器同时运转在不同的工作状态,搭建了非线性偏振旋转(NPR)技术和碳纳米管可饱和吸收体(CNT-SA)混合的掺铒光纤激光器。其中,基于NPR效应的腔内双折射引入的梳状滤波器可以实现双波长输出,NPR和CNT-SA的可饱和吸收效应共同作用可以获得调Q或调Q锁模脉冲,因此在该激光器中通过调节参数可以使光纤激光器同时获得双波长调Q和调Q锁模脉冲输出。该双波长脉冲经滤波处理后,观察到1531.23 nm处的波长对应调Q脉冲,其重复率为45.62 kHz,1557.18 nm处的波长对应调Q锁模,调Q包络重复率也为45.62 kHz,包络内锁模脉冲的重复率为18.18 MHz,与激光器腔长相符。该实验结果增强了光纤激光器工作的灵活性,有望进一步拓展其在相关领域的应用。In order to make the fiber laser operate in two different states simultaneously, the erbium-doped fiber laser with both nonlinear polarization rotation(NPR) technique and carbon nanotube saturable absorber(CNT-SA) was fabricated in this experiment. The intra-cavity birefringence-induced comb filter based on NPR effect was employed to realize the dual-wavelength operation, and the Q-switched and Q-switched mode-locking pulses could be achieved by utilizing the NPR technique and the CNT-SA together. Therefore, the coexistence of Q-switched and Q-switched mode-locking pulses could be obtained in the fiber laser by finely adjusting the cavity parameters. After filtering each wavelength, it was found that the lasing line at 1531.23 nm corresponded to the Q-switched pulse with repetition rate of 45.62 kHz, while the lasing line at 1557.18 nm corresponded to the Q-switched mode locking pulse.The Q-switched envelope repetition rate and pulse repetition rate of the Q-switched mode locking pulses are 45.62 kHz and 18.18 MHz, respectively. The experimental results would enhance the operation flexibility of fiber laser, and further expand its application in related fields.

关 键 词：调Q 调Q锁模 双波长 掺铒光纤激光器 

分 类 号：TN24[电子电信—物理电子学]