山东理工大学物理与光电工程学院, 山东 淄博 255049
以经过圆形孔径截断的 Bessel涡旋光束和Bessel-Gauss涡旋光束为例,数值模拟了近似无衍射涡旋光束在湍流大气中传输时引起的光束扩展和畸变光场中相位奇点的变化。仿真结果表明,与Bessel涡旋光束相比,Bessel-Gauss涡旋光束由大气湍流引起的束宽扩展较小,且在一定条件下其相位奇点代数和与入射涡旋光束的拓扑荷数保持一致;在远距离传输时,Bessel-Gauss涡旋光束相位奇点代数和的起伏偏差远小于Bessel涡旋光束。 Bessel-Gauss涡旋光束在自由空间光通信中作为信息载体具有较大的优势。
大气光学 无衍射涡旋光束 数值模拟 光束扩展 相位奇点
Author Affiliations
Abstract
State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
In this Letter, a gray-tracking-resistant—potassium titanyl phosphate (GTR-KTP) crystal is used for intracavity frequency doubling red laser generation for the first time. Under the 808 nm LD pump power of 180 W, as high as 12.5 W of red laser output is obtained with the optimum repetition rate of 7 kHz. Within the red laser power variation range between the maximum to 70%, a temperature tolerance is measured to be 35°C. The results prove that GTR-KTP should be a potential nonlinear crystal for red laser generation.
140.3480 Lasers, diode-pumped 140.3580 Lasers, solid-state Chinese Optics Letters
2015, 13(5): 051402
1 山东大学晶体材料国家重点实验室， 山东 济南 250100
2 山东理工大学理学院， 山东 淄博 255049
利用两片半导体可饱和吸收镜(SESAM)实现了稳定的被动锁模激光运转，获得了比单SESAM连续波锁模脉宽更窄、长时间运转稳定性更高的皮秒脉冲。理论上利用分步傅里叶变换法数值求解描述饱和吸收体被动锁模动力学过程的Haus主方程，模拟了双SESAM被动锁模的脉冲演化过程，分析了锁模激光脉冲形成过程与双SESAM可饱和吸收损耗系数q1和q2的关系,并计算得到了锁模脉冲宽度和锁模稳定区域等参数。计算结果与实验结果较为吻合。
激光器 被动锁模 半导体可饱和吸收镜 脉冲动力学 Haus主方程 全固态激光器
1 山东理工大学理学院， 山东 淄博 255049
2 山东大学晶体材料国家重点实验室， 山东 济南 250100
微柱阵列和透镜导管组成的耦合系统在激光二极管阵列(LDA)抽运的全固态高能量激光器中起着重要的作用，其光束耦合性能直接影响激光器的最终输出能量和光束质量。为了设计微柱阵列和透镜导管耦合系统的最佳结构参数，需要研究抽运光在耦合系统内部以及在激光晶体端面的分布。利用几何光学理论，对LDA的发射光线经微柱阵列和透镜导管的传输进行三维空间追迹，并计算其能量传输效率和光束整形效果。比较了六面体导管和渐细圆台形导管的耦合性能。仿真分析结果表明，六面体导管需要长度较大，能量传输效率略高，而圆台形导管可以较短，耦合整形后的光斑更接近圆形。
激光技术 微柱阵列 透镜导管 光线三维追迹
Author Affiliations
Abstract
1 School of Physics and Optoelectronic Information Technology, Shandong University of Technology, Zibo 255049
2 Department of Forensic Science and Technology, Shandong Police College, Ji'nan 250014
3 State Key Laboratory of Crystal Materials and Institute of Crystal Materials, Shandong University, Ji'nan 250100
We demonstrated the highly efficient continuous wave (CW) and Q-switched infrared laser from a diode-side-pumped Nd:YAG crystal. A CW output as high as 66 W at 1319 nm was achieved under the pump power of 460 W, corresponding to a coversion efficiency of 14.3%. A maximum average power of 8.9 W of TEM00 mode was obtained in Q-switched operation at the repetition rate of 8 kHz. The performance of the laser considering the thermal lens effect induced by pump power was also analyzed.
全固态1319nm激光 Nd:YAG 侧面泵浦 热效应 140.3580 Lasers, solid-state 140.3070 Infrared and far-infrared lasers 140.3480 Lasers, diode-pumped 140.3540 Lasers, Q-switched Chinese Optics Letters
2008, 6(2): 02124
Author Affiliations
Abstract
College of Physics and Electronics, Shandong Normal University, Ji'nan 250014
A diode-pumped passively Q-switched Nd:YLF laser was demonstrated by using saturable absorber of Cr4+:YAG. At the incident power of 7.74 W, pure passively Q-switched laser with per pulse energy of 210 'mu'J and pulse width of 19.6 ns at repetition rate of 1.78 kHz was obtained by using Cr4+:YAG with initial transmission of 80%. At the incident power of 8.70 W, a Q-switched mode-locking with average output power of 650 mW was achieved, the overall slope efficiency was 16%, corresponding to the initial transmission of 85% of Cr4+:YAG.
140.3530 Lasers, neodymium 140.3480 Lasers, diode-pumped 140.3540 Lasers, Q-switched 140.3580 Lasers, solid-state 140.4050 Mode-locked lasers Chinese Optics Letters
2006, 4(7): 407
