Design of a Compact Diode-Pumped Intracavity-Doubled Nd：GdVO4 Laser with 820-mW Red Light

We report a design of diode-pumped high power Nd:GdVO4/LBO red laser with a compact linear cavity, which can output 820-mW red light at 67Onto with an optical conversion efficiency of 9.6%. The maximum output power of the fundamental light at 1.34μm was 4W with a slope efficiency of 45%.     

红外线遥控鼠标设计

红外线遥控是目前使用最广泛的一种遥控手段，红外遥控装置具有体积小，功耗微，功能强，成本低的特点，基于这种优点，设计一种红外遥控鼠标器，用红外线取代鼠标器和计算机之间的连线，用按键控制。     

FAST_wmg用户界面优化与国际化的研究

首先介绍了基于波形法的有限元分析辅助软件系统FAST_wing的GUI(图形用户界面)设计,然后对FAST_wing的多语言(英文.中文,日文)用户界面进行了优化,创建了所有的命令都可以直接在XWindows下进行操作或可以用鼠标来控制的友好操作界面,并能简便的实现多语言之间的动态切换.     

Perturbation study via rotational-resolved spectrum in the triplet band d3Δ-a3∏(2, 1) of CO

The triplet band d³Δ-a³∏ (2, 1) of the CO molecule in the near infrared region of 12350--12850cm^-1 has been observed and analysed by taking into account the perturbation interaction between the d³Δ(v = 2) and a³∏ (v = 9) states. The most perturbed lines and most precise perturbation parameters, \alpha₂ and \beta₂, and electronic perturbation constants,\xi _\e and \eta _\e , for the d³Δ (v= 2) and ³∏ (v = 9) states have been obtained.     

一种具有遥控功能的液体点滴速度监控装置的设计

围绕液体滴速度的检测与控制技术,介绍一种具有遥控功能的液体点滴速度监控系统;该系统具有动态检测与显示点滴速度功能;可实现多种方式设置液体点滴速度并使用步进电机和偏心轮完成速度控制;网络实现远程监控,并具有报警功能,点滴速度控制精度可达1%±1;该系统操作简单、可靠,使用方便,能够代替护士监控病人。     

遥控潜水器轨迹跟踪自适应模糊滑模控制方法研究

针对ROV位置和姿态精确定位控制的难题,通过对ROV数学模型的分析,设计了ROV滑模控制器;系统通过模糊推理来自适应降低抖振和逼近未知的非线性函数部分,利用李亚普诺夫稳定性理论证明了该系统的收敛性和稳定性,最后利用Simulink对控制系统进行了仿真研究;仿真结果表明:该控制器能够保证轨迹跟踪误差的快速收敛性,及对外界干扰的鲁棒性,初始误差3 s收敛到零,验证了理论分析的正确性和有效性。     

基于互补梯度增强的红外线列扫描图像小目标检测

针对红外弱小目标难以识别、存在虚警的问题,根据红外线列探测器的噪声特性与小目标的梯度对称性,提出一种通过在图像梯度空间下构建多尺度堆叠增强重积分图(MSERI)来检测红外小目标的方法.估计不同的小目标尺寸,从多个方向计算图像的单向梯度图,利用估计尺寸寻找单向梯度图中各梯度值的互补梯度,对图像进行增强,之后对增强后的单向梯度图进行积分以还原图像并堆叠不同方向的积分图像,综合不同估计尺寸的堆叠图以获得增强结果.最后根据增强结果中的图像像素邻域的杂波峰-峰值计算自适应调节阈值,分割得到红外小目标.实验表明,所提方法在多种场景下均具有较好的检测能力与较低的虚警率,且运行速度优于其他性能类似的算法.     

Broadband Infrared Luminescence of Ni^2＋ in Petalite-Type Transparent Glass Ceramics

Transparent Ni^2＋-doped magnesium aluminosilicate glass ceramics are prepared. The formation of petalite-type crystallites in the glass ceramics is confirmed by x-ray diffraction. Broadband infrared luminescence centred at around 1235nm with full width at half maximum （FWHM） of about 300nm is observed from the Ni^2＋-doped glass ceramics. The observed infrared emission could be attributed to the ^3T2（F） → ^3A2（F） transition of octahedral Ni^2＋ ions in petalite-type crystallites. Theproduct of the fluorescence lifetime and the stimulated emission cross sections is 1.2 ×10-24 cm^2s.     

Infrared-to-visible and infrared-to-violet upconversion fluorescence of rare earth doped LaF3 nanocrystals

This paper reports that hexagonal-phase LaF3：Yb0.20^3＋,Er0.02^3＋ and LaF3：Yb0.20^3＋, Tm0.02^3＋ nanocrystals （NCs） were synthesized via a hydrothermal method. The transmission electron microscopy, selected area electron diffraction, powder x-ray diffraction, and thermogravimetric analysis are used to characterize the NCs. Under 980 nm excitation, the Yb^3＋/Er^3＋ and Yb^3＋/Tm^3＋ codoped NCs colloidal solutions present bright green and blue upconversion fluorescence, respectively. These NCs show efficient infrared-to-violet and infrared-to-visible upconversion. The upconversion fluo- rescence mechanisms of LaF2：Yb0.20^3＋, Er0.02^3＋ and LaF3：Yb0.20^3＋,Tm0.02^3＋ NCs are investigated with a 980-nm diode laser as excitation source.