Author Affiliations
Abstract
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033
2 Graduate School of the Chinese Academy of Sciences, Beijing 100039
3 Beijing Guoke Laser Technology Co., Ltd., Beijing 100085
In order to get high efficiency and high brightness laser output with single fiber coupled laser diode array, two laser diode array bars which have 40-W continuous wave (CW) output power at 980-nm wavelength are used in the experiment. The laser diode bars are collimated by two pieces of cylindrical micro lenses in the fast axis direction, and in the slow axis direction step mirrors are used to divide the beams of light to shape the output beam symmetrically. A piece of polarizing beam splitter cube is used to combine the two shaped beams. The focused output beam is coupled into a multimode fiber. More than 55-W output power is obtained from the fiber with core diameter of 400 microns and numerical aperture of 0.22, the total coupling efficiency is about 70% and the brightness is up to 10^(9) level.
140.2010 Diode laser arrays 140.3300 Laser beam shaping 140.3510 Lasers, fiber 060.1810 Buffers, couplers, routers,switches, and multiplexers 270.3430 Laser theory Chinese Optics Letters
2007, 5(s1): 53
Jianfeng Cui 1,2,3,*Zhongwei Fan 1,2,3Yan Xue 1,3,4Jing Zhang 1,3,4[ ... ]Yan Qi 1,2,3
Author Affiliations
Abstract
1 Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130022
2 Graduate School of the Chinese Academy of Sciences, Beijing 100039
3 Beijing GK Laser Technology Co., Ltd., Beijing 100085
4 Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100085
In order to get stable continuous wave (CW) mode-locked (ML) laser, conventionally, the laser cavity was designed to reach very small mode radius in the laser crystal to make the laser material saturated. While for the laser diode (LD) end pumped Nd:YVO4 without fiber coupling transmission, as long as choosing the appropriate short focus lens and making the focus area in front of the Nd:YVO4 small enough, we found even large cavity mode volume can make the laser material saturated. In addition, relatively large cavity mode volume can make high power output with single mode come true. Ideal beam quality without high order transverse mode oscillating, the CW ML state turned to be very stable. Accordingly, relatively large mode volume in the laser crystal was designed with semiconductor saturated absorber mirror (SESAM), over 1.5-W CW ML output with near diffraction limited was acquired. The optical-to-optical conversion efficiency reached 30%.
140.3480 Lasers, diode-pumped 140.3580 Lasers, solid-state 140.4050 Mode-locked lasers Chinese Optics Letters
2007, 5(s1): 42
1 中国科学院长春光学精密机械与物理研究所,吉林 长春 130033
2 中国科学院研究生院,北京 100049
3 北京国科世纪激光技术有限公司,北京 100085
4 有研半导体材料股份有限公司,北京 100035
5 中国科学院光电研究院,北京 100085
基于激光切片原理的分析,给出了厚硅片的高速激光切片方法,采用平凸腔补偿工作物质的热透镜效应,利用Nd:YAG棒本身的自孔径选模作用,获得了光束质量因子M2等于4.19的50 W 1.064μm激光输出。选取合适的扩束倍数、重复频率和出气孔直径,当切割0.75 mm厚的硅片时,切片速度达400 mm/min;当切割两层叠放的0.75 mm厚的硅片时,切片速度达到100 mm/min。切片的切口光滑,切缝较窄,重复精度高,切片质量好,达到用传统方法难以达到的切片效果。
激光技术 全固体激光器 声光调Q 激光切片 硅片 laser technology all solid-state-laser acoustooptical Q-modulation laser cutter silicon chip
对二极管横向抽运1.319μm大功率Nd:YAG激光器进行实验研究.采用横向抽运方式(CEO公司RD module),以φ4×115(单位mm)Nd:YAG晶体为激光工作物质,通过谐振腔设计和小孔光阑相结合的手段抑制高阶模的振荡,选取单横模,并且达到补偿晶体的较大热效应、提高单模的模式竞争能力的目的.在抽运光功率为343 W的条件下,得到功率大于6 W的TEM00模1.319μm连续激光输出,光束质量因子M2<2,激光功率不稳定度低于2%,最大光-光转换效率约为1.74%.
全固态激光器 二极管抽运 TEM00模
