增益开关型双波长同步脉冲Nd∶GdVO_(4)激光器  

Gain‐Switched Dual‐Wavelength Synchronized Pulsed Nd:GdVO_(4) Laser

作　　者：宋欢 胡淼[1] 许蒙蒙 李浩珍 毕美华[1] 周雪芳[1] 沈成竹 Song Huan;Hu Miao;Xu Mengmeng;Li Haozhen;Bi Meihua;Zhou Xuefang;Shen Chengzhu(College of Communication Engineering,Hangzhou Dianzi University,Hangzhou 310018,Zhejiang,China)

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018

出　　处：《中国激光》2023年第6期15-22,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(61705055);浙江省重点研发计划(2020C01106)。

摘　　要：设计了一种基于Nd∶GdVO_(4)晶体的增益开关型正交偏振双波长同步脉冲激光器。建立了对应的速率方程数学模型,分析了增益开关型Nd∶GdVO_(4)双波长同步脉冲激光器中的几何损耗对双波长脉冲时域特性的影响。搭建了基于布儒斯特偏振片的Y型腔结构的双波长脉冲激光器进行实验验证,通过调制抽运源电流实现了增益开关。实验结果表明,通过调节输出镜的倾斜角度,可实现双波长脉冲的同步输出。最后,当泵浦功率为6 W时,实验输出了脉冲重复频率为30.7~100.0 kHz可调、最高平均输出功率分别为215 mW和176 mW的正交偏振双波长[1063 nm(π偏振)和1065 nm(σ偏振)]同步脉冲。实验与理论结果吻合较好。Results and Discussions The laser pulse characteristics are investigated using a pump pulse width of 7.5μs,repetition frequency of 40 kHz,and pump power of 6 W.When the 1065 nm output mirror tilt angle is approximately 0.02°and the 1063 nm output mirror tilt angle is 0°,the laser achieves dual-wavelength pulse synchronization with a repetition rate of 40 kHz.The pulse widths at 1063 nm and 1065 nm are 120 ns and 150 ns,and the output powers are 143 mW and 96 mW,respectively.The pulse repetition frequency fluctuations are both less than 2%.By tuning the pump pulse repetition frequency,dual-wavelength synchronized pulse signals with a pulse repetition frequency of 30.7-100.0 kHz are realized.When the pump pulse repetition frequency lies between 30.7 kHz and 45.0 kHz,the average power of the dual-wavelength laser increases linearly with an increase in the pump repetition frequency,and the peak power of the dual-wavelength pulse remains unchanged.When the pump repetition rate lies between 45 kHz and 100 kHz,the average output power of the 1063 nm laser decreases with a rate of 0.8 mW/kHz,and the pulse peak power decreases with a rate of 0.25 W/kHz.The average output power of the 1065 nm laser decreases with a rate of 1.27 mW/kHz,and the pulse peak power decreases with a rate of 0.07 W/kHz.When the pump repetition rate is 100 kHz,the average output powers at 1063 nm and 1065 nm reach their highest values of 215 mW and 176 mW,respectively,and the total average output power is 391 mW.Objective Dual-wavelength synchronous pulsed lasers have important practical applications in fields including precision metrology,holographic interferometry,lidar,and coherent terahertz(THz)wave generation.One approach to obtain dual-wavelength synchronized pulsed lasers is based on a Y-type-cavity dual-crystal laser combined with a saturable absorber,which achieves power balance by adjusting the pumping power of the respective laser crystals.Another approach is based on a linear laser cavity combined with a saturable absorber and dual-g

关 键 词：激光器 激光技术 增益开关 双波长激光器 时间特性 

分 类 号：TN248.1[电子电信—物理电子学]