强激光与粒子束
2020, 32(8): 083002
1 Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, China
2 Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
3 State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yatsen University,Guangzhou 510275, China
4 Centre for Quantum Photonics, H. H. Wills Physics Laboratory, Department of Electrical and Electronic Engineering,University of Bristol, Bristol BS8 1UB, UK
In this paper, we proposed and experimentally demonstrated a route-asymmetrical light transmission scheme based on the thermal radiative effect, which means that forward and backward propagations of an optical device have different transmittances provided they are not present simultaneously. Employing a fiber-chipfiber optomechanical system, our scheme has successfully achieved a broad operation bandwidth of at least 24 nm and an ultra-high route-asymmetrical transmission ratio (RATR) up to 63 dB. The route-asymmetrical device has been demonstrated effectively with not only the continuous- wave (CW) light but also 10 Gbit/s on-off-keying (OOK) digital signals. Above mentioned unique features can be mostly attributed to the significant characteristics of the thermal radiative effect, which could cause a fiber displacement up to tens of microns. The powerful and significant thermal radiative effect opens up a new opportunity and method for route-asymmetrical light transmission. Moreover, this research may have important applications in all-optical systems, such as the optical limiters and ultra-low loss switches.
route-asymmetrical light transmission route-asymmetrical light transmission thermal radiative effect thermal radiative effect optomechanical system optomechanical system route-asymmetrical transmission ratio (RATR) route-asymmetrical transmission ratio (RATR) Frontiers of Optoelectronics
2016, 9(3): 489
1 西北核技术研究所, 陕西 西安 710024
2 中国华阴兵器试验中心, 陕西 华阴 714200
透射比是评价格兰泰勒棱镜性能优劣的一个重要指标,分析了偏振干涉成像光谱仪中重要偏光部件即格兰泰勒棱镜的分光机理,运用光线追迹方法,推导出了晶体光轴不平行时棱镜透射比精确理论计算公式;通过计算机模拟对其传输特性进行了详尽分析,得出了系统透射比随晶体光轴倾斜角和波长变化的关系曲线;给出了在满足系统透射比条件下格兰泰勒棱镜晶体光轴误差被限定的有效区间范围。这一结论为偏振干涉成像光谱仪的优化设计提供了理论指导和技术支持。
光谱学 成像光谱技术 格兰泰勒棱镜 透射比 晶体光轴 激光与光电子学进展
2014, 51(5): 053001
1 中国工程物理研究院 激光聚变研究中心, 四川 绵阳621900
2 国防科学技术大学 理学院, 长沙 410073
采用理论与实验相结合的方法研究了激光二极管阵列泵浦的Cr4+:YAG被动调Q Nd:YAG激光器的输出特性。重点分析了调Q晶体小信号透过率和反射镜的反射率对激光器的输出能量、脉冲宽度的影响。对数值模拟结果进行了实验验证,数值计算与实验结果基本一致。研究结果表明,在特定的激光晶体参数下,Cr4+:YAG被动调Q激光器的输出能量与脉冲宽度由调Q晶体的小信号透过率和输出镜的反射率决定:输出能量随着小信号透过率增加而减小,对应于一个调Q晶体透过率,有一个最佳反射率使输出能量最大;脉冲宽度随着初始透过率与反射率的增大而增大。of Cr4+:YAG passively Q-switched laser
调Q激光器 Cr4+:YAG晶体 小信号透过率 输出特性 Q-switched laser Cr4+:YAG crystal small signal transmission ratio output characteristics
北京航空航天大学,光电技术研究所,北京,100083
光纤陀螺是干涉型传感器,光的偏振特性影响该传感器的精度,因此需要对光纤的偏振态进行精确的测试.目前国外有些公司出售检偏系统,但所给的指标并不高,而且价格也非常昂贵,国内使用的测试系统一般都为自制,精度普遍不高,实际测量的消光比小于系统的理论消光比.有偏振特性系统的设计和测试结果,却没有系统误差原因的详细分析.针对这一问题,在给出了高精度保偏光纤偏振测试系统的光路结构基础上,对系统中影响消光比的光路误差进行了分析和计算.通过理论分析和计算机模拟计算,得到本系统的消光比在给定的误差范围内可以达到55 dB,能够满足高精度的测量.同时,在计算中得到了e光和o光的透射率,计算结果中棱镜e光的透射率比以往的结果精确2.34%.
保偏光纤 偏振特性 消光比 透射率 PM optical fiber Polarization characteristics Extinction ratio Transmission ratio
激光与红外干扰材料的特性测量中,为克服热像仪温度分辨率低的缺点,设计了高精度激光与红外对抗材料特性测试系统,该系统光源采用带精密功率和温度控制的半导体激光器(1.06μm)和中远红外辐射板(3~5μm,8~12μm),并采用斩波频率为12 Hz的机械斩波方式.探测器选用高灵敏度的带滤光片的PIN管和热释电探测器,光学接收系统采用φ178 mm的卡塞格伦聚光接收系统,测试系统的软件用Measurement studio编写,采用了128阶FIR数字带通滤波器和AR功率谱模型进行数字信号处理,系统透过率测量分辨率>0.5%,测量精度>1%,测量距离>200m,并且提供了完备的试验数据和图表的分析、统计的功能.
激光技术 红外 材料特性 透过率
1 南开大学现代光学研究所,天津,300071
2 信息产业部电子第46研究所,天津,300220
采用自行研制的内包层为矩形的掺Yb3+双包层石英光纤,以透射率不同的一组二向色镜为后腔镜构成了双包层光纤激光器。实验证明:后腔镜具有较高透射率为佳;后腔镜可以实现对激光波长的控制;激光斜率效率与后腔镜透射率之间的关系符合指数变化规律,在本实验的条件下,斜率效率的最大值约60%。
导波光学 矩形内包层光纤 掺Yb 3+双包层光纤激光器 透射率 斜率效率