直接抽运Cr,Nd…YAG/GTR-KTP腔内倍频高效稳定自调Q绿光激光器  

Stable and Efficient Intracavity Frequency-Doubled Cr,Nd…YAG/GTR-KTP Self-Q-Switched Green Laser Under Direct Pumping

作　　者：林博鑫 董俊(指导)[1] Lin Boxin;Dong Jun(Laboratory of Laser&Applied Photonics,Department of Electronic Engineering,Xiamen University Xiamen,Fujian 361005,China)

机构地区：[1]厦门大学电子工程系激光与应用光子学实验室,福建厦门361005

出　　处：《激光与光电子学进展》2017年第4期217-225,共9页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61275143;61475130)

摘　　要：采用885nm激光二极管(LD)作为抽运源,Cr,Nd…YAG双掺晶体和抗灰迹KTP(GTR-KTP)分别作为工作物质和倍频晶体,在室温下实现了直接端面抽运Cr,Nd…YAG/GTR-KTP腔内倍频自调Q稳定脉冲绿光激光高效输出。当吸收抽运光功率为1.65 W时,获得了200mW自调Q脉冲绿光激光输出,相应的光-光转换效率为12.1%。当吸收抽运光功率大于1.15 W时,获得了脉冲能量大于8μJ、脉冲宽度为8.8ns、峰值功率超过1kW的自调Q脉冲绿光激光输出。利用速率方程从理论上分析了不同Nd^(3+)离子掺杂浓度对Cr,Nd…YAG/GTR-KTP腔内倍频自调Q激光器输出倍频功率的影响,获得了实现高效绿光输出的优化掺杂浓度。相比于其他885nm LD抽运腔内倍频产生绿光激光的方法,直接抽运Cr,Nd…YAG/GTR-KTP腔内倍频自调Q激光器可作为理想的激光源并有效压缩脉冲宽度,是一种实现高效、短脉冲小型化绿光激光器的新方法。Employing an 885 nm laser diode （LD） as the pumping source, the stable and highly efficient performance of a Cr, Nd： YAG/GTR-KTP intracavity frequency doubled self-Q-switched miniature green laser under end-pumping is demonstrated at room temperature by using the co-doped crystal Cr, Nd： YAG and gray tracking resistant KTP （GTR-KTP） crystal as laser active material and frequency doubling crystal respectively. The maximum average output power of 200 mW at 532 nm is achieved when the absorbed pump power is 1.65 W, and the corresponding optical-to-optical efficiency is 12.1%. When the absorbed pump power is greater than 1.15 W, the self-Q-switched green laser pulse is achieved with the energy over 8 /aJ, the pulse width 8.8 ns and the peak power over 1 kW. Effects of different Nda＋ doping concentrations on the output frequency doubling power of a Cr, Nd： YAG/GTR-KTP intracavity frequency doubled self-Q-switched miniature green laser theoretically analyzed with the rate equations. The optimized Nda＋ doping concentration is obtained to achieve efficient green laser output. Compared with those methods generating green laser under 885 nm laser pumping, the directly pumped Cr, Nd： YAG/GTR-KTP intracavity frequency doubling self-Q-switched green laser is demonstrated to be a more ideal laser source for compressing pulse width effectively, and it provides a new method for developing highly efficient, short-pulse miniature green laser.

关 键 词：激光器 自调Q激光器 直接抽运 腔内倍频 Cr Nd YAG 

分 类 号：TN248[电子电信—物理电子学]