二硫化钨掺铒光纤激光器调Q特性  

Q-Switched Characteristics of Tungsten Disulfide Er-Doped Fiber Laser

作　　者：杨春玉[1] 刘孟丽[1] 于维天 张玉佳[1] 刘文军[1,2] 

机构地区：[1]北京邮电大学理学院,北京100876 [2]北京邮电大学信息光子学与光通信国家重点实验室,北京100876

出　　处：《中国激光》2017年第7期174-178,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(11674036);信息光子学与光通信国家重点实验室(北京邮电大学)自主研究课题(IPOC2016ZT04)

摘　　要：二硫化钨(WS_2)具有显著的可饱和吸收特性,广泛应用于光电子器件的制备。研究了基于WS_2可饱和吸收体(WS_2SA)的全光纤被动调Q掺铒光纤激光器。采用脉冲激光沉积法,将WS_2均匀生长在拉锥光纤表面,在WS_2表面镀金膜以防止其被氧化,此方法增加了WS_2 SA的抗干扰能力。利用平衡双探测器法,测得WS_2 SA的调制深度约为15.2%,饱和强度为2.84 MW/cm^2,非饱和损耗为78%。通过旋转偏振控制器,得到了光纤激光器在不同抽运功率下的稳定调Q输出脉冲序列;当抽运功率在300~630mW范围内变化时,激光器重复频率的可调谐范围为174~250kHz。实验结果表明,该光纤激光器输出的最窄脉冲宽度为780ns,最大输出功率为18mW,单脉冲能量为23.5nJ,信噪比为85dB,所提出的调Q光纤激光器具有较好的稳定性。Tungsten disulfide （WSz） is widely used in the fabrication of optoelectronic devices due to its remarkable saturable absorption characteristics. All-fiber passively Q-switched Edoped fiber lasers based on WSz saturable absorber （WS2 SA） are studied. With pulse laser deposition method, WS2 is uniformly grown on the tapered fiber surface. The gold film is deposited on the surface of WS2 to avoid WS2 being oxidized, and this method increases anti-interference capability of WSe SA. With the balanced twin-detector method, the modulation depth of 15.2%, saturation intensity of 2.84 MW/cm2 and unsaturated loss of 78% of WS2 SA are measured. Stable Q-switched output pulse sequences of fiber laser with different pump powers are obtained when we rotate the polarization controller. When pump power ranges from 300 mW to 630 mW, the laser repetition rate can be tuned from 174 kHz to 250 kHz. Experimental results show that the narrowest pulse width is 780 ns, the maximum output power is 18 mW, the single pulse energy is 23.5 nJ, and the signal-to noise ratio is 85 dB. The proposed Q-switched fiber lasers have good stability.

关 键 词：激光器 光纤激光器 被动调Q 二硫化钨 脉冲激光沉积法 

分 类 号：TN248.1[电子电信—物理电子学]