Author Affiliations
Abstract
1 National Key Laboratory on Solid-State Laser, Beijing 100015, China
2 University of Shanghai for Science and Technology, Shanghai 200093, China
3 Institute for Laser Science, University of Electro-Communications, Tokyo 182-8585, Japan
A rotating neodymium-doped yttrium aluminum garnet (Nd:YAG) disk laser resonator for efficiently generating vector beams with azimuthal and radial polarization is demonstrated. In the study, the laser crystal rotary for thermal alleviation and polarization discrimination uses c-cut ytterbium vanadate (YVO4). The laser output could be switched between azimuthal and radial polarizations by simply adjusting the cavity length. The laser power reached 4.38 W and 4.64 W for azimuthally and radially polarized beams at the slope efficiencies of 45.3% and 48.5%, respectively. Our study proved that an efficient, high-power vector rotary disk laser would be realistic.
cylindrical vector beam rotary disk polarization Chinese Optics Letters
2020, 18(12): 121401
1 中国科学院上海光学精密机械研究所信息光学与光电技术实验室, 上海 201800
2 中国科学院大学, 北京 100049
3 日本电气通信大学激光研究所, 东京 182-8585
径向偏振光聚焦后可以产生很强的纵向电场。以此为出发点, 首先依据基尔霍夫衍射理论, 计算得到了径向偏振光经锥面镜会聚后所形成的横截面呈现零阶贝塞尔函数分布的纵向电场, 分析了会聚区域光场的相干长度和横向宽度与入射光光斑尺寸、锥面镜的锥顶角以及锥面镜出射端半径的关系。在此基础上, 提出采用锥面镜和筒形反射镜的复合结构, 通过设计合适的锥面镜和筒形反射镜参数, 实现纵向电场的级联, 且电场呈周期性分布。分析了筒形反射镜的参数对所形成的级联纵向电场的横向宽度、周期和占空比等的影响。结果表明, 当所采用的锥面镜的锥顶角为60°时, 出射端半径和筒形反射镜的内径均为999.682λ(λ为波长), 可以实现周期长度为1154λ、占空比为1的纵向电场的级联; 当用于电子加速时, 加速区长度甚至可达到米级。这种级联纵向电场的设计将进一步使得电子的加速区长度得到显著增加, 为电子加速到更高能量提供了可能。
物理光学 径向偏振光 纵向电场 锥面镜 筒形反射镜 级联电子加速
Author Affiliations
Abstract
We demonstrate a linearly-polarized, ytterbium-doped fiber laser that uses an uncoated, undoped ceramic YAG plate as the output coupler, and the corresponding polarization extinction ratio of laser beam increases with incident pump power and then saturates at larger pump power. For comparison, the output coupler of the fiber laser is replaced by 10% reflectivity plane mirror, while the feature of the polarization of laser output is kept unchanged. The results show that the origin of the pump-dependent and self-started polarization is associated with the intensity-dependent nonlinear birefringence in the gain fiber.
140.3510 Lasers, fiber 140.3615 Lasers, ytterbium 140.3480 Lasers, diode-pumped 060.2320 Fiber optics amplifiers and oscillators Chinese Optics Letters
2012, 10(9): 091408
1 中国科学院上海光学精密机械研究所, 上海 201800
2 Institute for Laser Science, University of Electro-Communications, Japan
用光纤耦合激光二极管抽运Cr,Yb:YAG晶体获得了1.03 μm的自调Q激光输出,输出的调Q脉冲非常稳定,抽运阈值功率为680 mW,脉冲宽度为3.3 ns,获得的平均功率为156 mW,斜率效率为18.5%。随着抽运功率的增大,重复频率成线性增长,而脉宽略有减少,单脉冲能量和峰值功率都始终呈增大趋势。光束质量因子M2为1.17。
材料 Yb:YAG晶体 自调Q激光 固体激光器 抽运
1 华南师范大学激光生命科学研究所,广州,510631
2 Institute of Laser Science, University of Electro-Communications, Tokyo, 182-8585, Japan
采用单频高功率Nd:YVO4激光的倍频光(532 nm)作为抽运源,激发长度为250 m和920 m的单模石英光纤,开展了石英光纤在可见光谱范围内的受激拉曼散射实验研究,获得了宽带宽的、第1级到第4级受激拉曼散射Stokes光谱,拉曼频移峰值分别为450 cm-1,1064 cm-1,1610 cm-1和2168 cm-1.
光纤 受激拉曼散射 宽带Stokes光谱 拉曼光纤激光器
1 Institute of Laser Life Science, SOuth China Normal University, Guangzhou 510631
2 Institute of Opto-Electronics, Harbin Institute of Technology, Harbin 150006
3 Institute for Laser Science, University of Electro-Communications, Chofu, Tokyo 182, Japan
Chinese Journal of Lasers B
1998, 7(1): 1
