具有更高激光功率的新型加工支持系统

在加工制造业，从焊接、切割到粉末金属喷镀，对激光功率的要求正推动二氧化碳激光器机械加工系统向更高的功率水平发展。随着激光光源技术的进步，对有效利用激光功率的要求使机械加工设备支持系统得以同步发展。这些支持系统包括机械运动控制系统、高压辅助气体传递控制系统和高流速切割喷嘴技术等。     

欧盟将资助发光聚合物的研究

据报道，一家欧洲财团将投资2000万欧元以便进行平面塑料光源的商业性开发。     

Research on charge ordering and magnetic properties in La0.3Ca0.7Mn1-xWxO3 system

The perovskite manganite sample La0.3Ca0.7Mn1-xWxO3 （x = 0.08, 0.12） was prepared by the solid-state reaction method. The effect of W doping on the Mn site to La0.3Ca0.7MnO3 charge ordering phase and the changing process of magnetic properties were studied through the measurement of the M-T curve, M-H curves, and ESR curves of the sample. The results showed that when x = 0.08, the charge ordering （CO） phase exists in the system, the transition temperature Tco= 275 K, and the system exhibits PM when T 〉 275 K. The system transforms from spin-disordering paramagnetism to spin-ordering antiferromagnetism in the charge ordering state with the temperature decreasing from 275 K to 230 K. The long-range antiferromagnetism forms and AFM/CO states coexist between 230 K and 5 K. There is a little ferromagnetic component in the AFM/CO background in a low temperature range. When x = 0.12, the CO phase in the system has almost melted completely. There is a little remnant of the CO phase below 150 K. The system exhibits paramagnetism when T 〉 150 K and transforms from paramagnetism to ferromagnetism when T〈 150 K.     

松下为激光光源背投电视自主开发绿色激光元件

松下电器产业和松下电子成功试制出了使用半导体激光元件作为光源的背投电视。这款52英时产品在显示元件中使用了3枚透过型液晶。色彩表现范围与NTSC规格相比高达137％。其特点是光源耗电量仅约50W。大概只有使用高压水银灯的老式背投电视的一半。     

Experimental Research on Erbium-doped Superfluorescent Fiber Source

The effects of the variations in fiber length, fiber mirror reflectance on efficiency and output power are experimentally investigated for erbium-doped double pass backward superfluorescent fiber sources (SFSs). The influence of fiber length on mean wavelength stability (MWS) has also been demonstrated. By incorporating a short section of un-pumped erbium-doped fiber (EDF) at the output port, the pump power dependent on MWS becomes independent of pumped EDF length. This is a novel phenomenon that hasn‘t been reported up to now,and should be helpful to SFS fabrication and theory analysis. By using a fiber Michelson interferometer as spectrum slicing component,a multi-wavelength fiber source (MWFS) with ～20 channels (from 1542nm to 1559nm) is got. The MWFS has a channel spacing of ～0. 8 nm which satisfies ITUstandard. The intensity fluctuation among channels is less than 0.5dB,and the extinction ratio of all channels is above 14dB. This kind of MWFS should be useful to wavelength division multiplexing systems.     

激光显示业期望新光源

在饱受经济萧条之苦后，激光业正翘首期望激光显示市场的繁荣。虽然美国很多一流的激光显示公司已离开这个行业，但从2003年国际激光显示会议上却不难看出这一行业已出现复苏迹象。     

现代照明光源的发展趋势

该文从照明光源的发展历史开始，介绍了现代照明光源及发展中的新型电光源产品。     

DV夜景拍摄技巧

城市的夜仿佛比白天更具有活力，闪烁的霓虹、游走的人群、移动的车流、各种建筑的灯光等等，这一切组成城市美丽的夜景。要想用DV记录下这些夜景，却不是那么容易的事情，这一方面是由于DV本身的特性所决定，所拍摄的和我们所看到还是有一定的差别。因此，用DV拍摄夜景不同于白天拍摄，需要使用更多的技巧，这样才能留住这些美丽的瞬间。     

固态盘设计

本文给出了一种与目前一般的工业控制机中所使用的嵌入式固态盘（ｅｍｂｅｄｄｅｄＳＳＤ）以及微型机中使用的固态盘卡（ｂｕｉｌｄ—ｉｎＳＳＤ），介绍了不同的ＳＳＤ的设计策略和方法，论述了按此策略和方法研制的可靠性、可维护性、可扩充性和通用性。在此ＳＳＤ所能模拟的范围内，对不同的目标磁盘式磁鼓只需改写有关的ＥＰＲＯＭ、ＰＲＯＭ，选择配制开关（跨接线）不同位置，即可实际取代相应的目标磁盘或磁鼓，不必改动原系统中的任何软硬件。