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二极管激光器
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  laser diodes
A continuous-wave lasing at 1 μm was excited by the radiation of semiconductor laser diodes at room temperature in nanocrystalline ceramics Y2O3 doped with Nd3+ and Yb3+ ions.
      
The heterostructures obtained are used to fabricate laser diodes.
      
It is shown that the absorption spectrum of NYF:Er crystals contains wide bands (790-801 and 965-980 nm) corresponding to the emission range of laser diodes.
      
The proposed model is shown to faithfully describe experimental data obtained for laser diodes based on InGaAs quantum dots in an AlGaAs/GaAs matrix, as well as InAs quantum dots in an InGaAs/InP matrix.
      
Correlation between the reliability of laser diodes and the crystal perfection of epitaxial layers estimated by high-resolution
      
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The requirements for lasers,optical setups,recording materials and chemical processing to make large format holograms of great scenes are discussed.A model of Suzhou Industrial Park measuring 160×180cm,and other large models were recorded using an argon ion laser with an etalon on self prepared ultra fine grain silver halide plates(average grain size:20nm).Large format transmission holograms (size:50×40cm) of high diffraction efficiency and low noise level were obtained with proper exposure and chemical...

The requirements for lasers,optical setups,recording materials and chemical processing to make large format holograms of great scenes are discussed.A model of Suzhou Industrial Park measuring 160×180cm,and other large models were recorded using an argon ion laser with an etalon on self prepared ultra fine grain silver halide plates(average grain size:20nm).Large format transmission holograms (size:50×40cm) of high diffraction efficiency and low noise level were obtained with proper exposure and chemical processing.The holograms mounted in a specially designed compact frame and illuminated with a 70mW green diode laser showed very good visual effect in the Jiangsu Hall of the China's Achievements Exhibition for the 50 th Anniversary of the Founding of the P.R.China.

分析了制作大幅面大场景激光再现全息图对激光器及光路布置、记录介质、化学处理等方面的特殊要求 ,用自制的颗粒平均尺寸为 2 0nm的超细颗粒卤化银全息干板及带标准具的氩离子激光器 ,对场景面积达 1 60× 1 80cm的苏州工业园区等模型作全息记录 ,经适当曝光和化学处理 ,制得了幅面达 50× 40cm ,且具有较高衍射效率和较低噪声的透射全息图。将全息图安装在专门设计的紧凑装置上 ,用 70mW绿光二极管激光器照明再现 ,在北京展览馆建国五十周年成就展江苏馆展出时 ,获得了令人满意的视觉效果。

 
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