可调脉冲宽度的调Q掺铥双包层光纤激光器  

Adjustable pulse width thulium-doped Q-switched double-clad fiber laser

作　　者：张灵聪[1,2,3] 杜戈果[1,2,3] 赵俊清[1,2,3] 郭春雨[1,2,3] 阮双琛[1,2,3] 

机构地区：[1]深圳市激光工程重点实验室,广东深圳518060 [2]先进光学精密制造技术广东普通高校重点实验室(深圳大学),广东深圳518060 [3]深圳大学电子科学与技术学院,广东深圳518060

出　　处：《应用光学》2013年第2期363-367,共5页Journal of Applied Optics

基　　金：国家自然科学基金(61275144);深圳市科技研发基金基础研究计划(1104300029783024)

摘　　要：在激光器输出平均功率一定的情况下,峰值功率主要取决于调制频率和脉冲宽度。这使得脉冲宽度的调节具有一定的实际应用价值。对调Q掺铥双包层光纤激光器进行研究,首先确定了激光器的最佳输出透过率,在65%最佳透过率时,得到2μm激光的输出功率3.9 W,斜率效率为31%。外接一个信号发生器,信号门宽从12μs变化到18μs,并测量了调制频率分别在30kHz、40kHz和50kHz时输出脉冲宽度的变化情况,得到了555.6 W的最高峰值功率,实现了脉冲宽度从163.4ns到207.9ns的变化。实验情况证实了用外接信号发生器能有效控制激光器的输出脉冲宽度。The peak power is determined by the modulation frequency and pulse width with the average output power of laser settled, thus the tunability of pulse width has its value in prac- tice. The thulium-doped Q-switched double-clad fiber laser was investigated. With optimum transmissivity of 65% the output power of 2μm laser was 3.9 W and the corresponding slope efficiency was 31%. The signal gate width was adjusted from 12μs to 18 μs with the external signal generator. Pulse width was measured at modulation frequency of 30 kHz, 40 kHz and 50 kHz, and maximum peak power of 555.6 W was attained. The pulse width varied from 163.4 ns to 207.9 ns. The experiment result shows pulse width of laser can be effectively controlled by using external signal generator.

关 键 词：铥 双包层光纤 可调脉冲宽度 声光调Q 光纤激光器 

分 类 号：TN248[电子电信—物理电子学]