1 绍兴文理学院 数理信息学院, 浙江 绍兴 312000
2 温州大学 物理与电子信息工程学院, 浙江 温州 325035
3 中国科学院 上海硅酸盐研究所, 上海 200050
报道了基于Nd∶YAG透明陶瓷4F3/2-4I15/2跃迁实现1.83 μm激光输出的研究。采用简单紧凑的平凹腔结构，结合对腔镜镀膜参数的设计，控制其他能级跃迁谱线对应波长激光的透射损耗来抑制较强能级跃迁对应的激光振荡。在入射抽运功率14.6 W的808 nm波长半导体激光端面抽运Nd∶YAG透明陶瓷，获得了0.65 W的1.83 μm激光输出，斜率效率5.8%。可见Nd∶YAG透明陶瓷可望成为获得1.8 μm波段激光直接输出的激光介质。
端面泵浦 1.8 μm波段 Nd∶YAG透明陶瓷 end pumped 1.8 μm laser Nd∶YAG transparent ceramic 强激光与粒子束
2017, 29(4): 041005
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 Department of Physics, Shaoxing University, Shaoxing 312000, China
3 University of Chinese Academy of Sciences, Beijing 100039, China
We theoretically investigate multiple electron rescatterings in high-order harmonic generation with a wide range of driving laser wavelengths. In order to obtain a clear and intuitive insight, the time-frequency analysis of the dipole acceleration calculated by the numerical solution of the time-dependent Schr dinger equation is performed and compared with the classical electron trajectory calculation. The result shows that in the mid-infrared regime, the high-order electron trajectory associated with multiple rescatterings plays a more important role than the usually referred-to “long and “short” electron trajectories. To provide quantitative evidence, the strong-field approximation is used to calculate the yield ratio of the high-order harmonic generation from the first rescattering and the multiple rescatterings.
020.2649 Strong field laser physics 190.2620 Harmonic generation and mixing 320.2250 Femtosecond phenomena 320.7110 Ultrafast nonlinear optics Chinese Optics Letters
2016, 14(3): 030201
Author Affiliations
Abstract
1 School of Physics Science and Engineering, Tongji University, Shanghai 200092, China
2 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
3 Department of Physics, Shaoxing University, Shaoxing 312000, China
We experimentally and theoretically demonstrate that the property (odd or even) of generated harmonics can be selected by manipulating the macroscopic phase-matching conditions based on a three-color laser field. Only odd or even harmonics can be made dominant by changing the focal position and adjusting the gas pressure. These results indicate that the odd-even property of the generated harmonics can be controlled by using the multi-color laser field with macroscopic phase-matching.
020.1335 Atom optics 020.2649 Strong field laser physics 190.2620 Harmonic generation and mixing Chinese Optics Letters
2015, 13(5): 050202
温州大学 物理与电子信息工程学院，浙江 温州 325035
报道了基于非临界相位匹配磷酸钛氧铷晶体(RTP)的光参量振荡激光性能研究。采用激光二极管端面抽运Nd:YAP激光晶体，组成内腔式RTP-OPO系统，对比了在不同声光调Q重复频率下的信号光输出特性。在20 kHz重复频率和13.1 W的抽运入射功率下，获得平均功率1.1 W的1.65 μm人眼安全激光的输出，光-光转化效率为8.4%；在重复频率为5 kHz时，获得了最窄脉4.4 ns，最高单脉冲峰值功率30.8 kW。结果表明，基于RTP晶体的OPO变频是获得1.6 μm波段激光的一种有效新途径。
1.6 μm波段激光 RTP晶体 非临界相位匹配 光参量振荡 1.6 μm band laser RTP crystal critical phase matching optical parametric oscillator
Author Affiliations
Abstract
1 State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
2 College of Physics and Electronic Information Engineering, Wenzhou University, Wenzhou 325035, China
3 School of Physical Science and Technology, Shanghai Tech University, Shanghai 200031, China
A new polarization gating is demonstrated by our principle-of-proof experiment, which is theoretically proposed to generate the isolated or double attosecond pulses with the multi-cycle driving laser pulse in the previous work [Optics Express. 20, 5196 (2012)]. In the experiment, the polarization gating is formed by two orthogonally-polarized linearly chirped multi-cycle laser pulses, and the spectral bandwidths of the harmonics are broadened by more than two times, which agree with the previous theoretical work.
020.1335 Atom optics 020.2649 Strong field laser physics 190.2620 Harmonic generation and mixing Chinese Optics Letters
2014, 12(4): 040201
Author Affiliations
Abstract
We experimentally investigate the high-order harmonic generation in argon gas cell driven by a multi-cycle broadband infrared laser pulse from a tunable optical-parametric-amplifier (OPA) source. The generation of high-order harmonic continuum with the cut-off photon energy up to 110 eV is observed by tuning the chirp of the 800-nm laser pulse which pumps OPA source. The generation of harmonic continuum is understood in terms of the two-hump structure of the OPA output spectrum and the optimal relative phase of the two humps. The demonstrated scheme is of importance for the generation of extreme ultraviolet (XUV) continuum at higher photon energy region.
020.2649 Strong field laser physics 190.2620 Harmonic generation and mixing 190.4410 Nonlinear optics, parametric processes Chinese Optics Letters
2014, 12(3): 030201
1 College of Physics and Electronic Information Engineering, Wenzhou University, Wenzhou 325035, China
2 Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China
1 中国科学院上海光学精密机械研究所强场激光物理国家重点实验室, 上海 201800
2 中国科学院研究生院, 北京 100049
设计了一个激光光斑实时监测与光路自动准直装置,能够实时监测激光光斑并自动准直激光输出方向。基于透镜成像原理,使用CCD探测器获得光斑的二维成像,并根据两点确定一条直线原理和使用压电陶瓷电动调整架实现光路自动准直; 监测控制程序采用虚拟仪器开发软件Lab View编写,可以实时监测激光光斑模式与光斑位置抖动情况,并进行反馈控制。经测试,设计装置的调整精度达0.5 μrad,反馈控制频率约1 Hz,完全可降低或消除抖动周期在1 s以上的光斑飘移。
光学设计 实时监测 自动准直 程控
