Entangled photons are the fundamental resource in quantum information processing. How to produce them efficiently has always been a matter of concern. Here we propose a new way to produce correlated photons efficiently from monolayer
In our investigation, lead germanium telluride, which is a pseudo-binary alloy of IV-VI narrow-gap semiconductor compounds of PbTe and GeTe, can be used in the fabrication of mid-wavelength infrared narrow bandpass filters as a high-index coating material
本文基于把样品池当作薄位相板,运用傅里叶光学理论,对探测束非聚焦CW双束正交热透镜构型进行了理论分析,预示了由此构型产生的热透镜特性。
We report a continuous-wave Er:ZBLAN fiber laser with the operation wavelength reaching 3.68 μm. The mid-infrared Er:ZBLAN fiber laser is pumped with the dual-wavelength sources consisting of a commercial laser diode at 970 nm and a homemade Tm-doped fibe
以LD泵浦光在侧泵模块水冷结构中的传输过程为研究内容, 基于模块结构参数、光波传输特性及介质透光特性, 系统分析了泵浦光在各介质表面和内部的偏振态变化、光强衰减过程及变化规律。重点分析了由介质表面菲涅尔效应和内部吸收效应等造成的光强衰减; 计算了泵浦光在水冷结构中单次往返过程的损耗系数和偏振态变化矩阵。分析结果对于优化模块泵浦效率、增强散热效果等有一定借鉴作用。
针对固定红外摄像机视频监控在夜雾天况下获得的成像效果差、监控范围有限等问题,运用带云台的LED红外摄像机,结合红外成像与可见光成像的特点,提出一种变焦式夜雾天彩色视频构建的方法。该方法在天气状况良好的白天利用可见光成像特点实现全景图像接拼,然后将红外图像与全景图像配准,从而构建出视场角一致的可见光背景图像。在能见度较低的夜雾下利用红外成像系统提取运动目标,然后通过掩模融合算法和配准参数,将运动目标
提出了一种新的剪切散斑干涉方法─—二次波面干涉的剪切散斑干涉计量术.这一方法将被测物体变形前后波面的第一次干涉信息分别储存在两张全息干板上,通过光学信息处理实现波面的第二次干涉.两次波面干涉分别消除了位移和位移的一阶导数场对波面位相的影响,得到仅反映位移二阶导数场的条纹图.
A method for local magneto-optical Kerr effect imaging based on a home-made scanning near-field optical microscope working in reflection mode is presented. Shear force detection is carried out by using a symmetric piezoelectric bimorph sensor, which provi
The use of low-coherence light is expected to be one of the effective ways to suppress or even eliminate the laser–plasma instabilities that arise in attempts to achieve inertial confinement fusion. In this paper, a review of low-coherence high-power lase