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Li S.,Light Technology | Li S.,North Night Vision Science & Technology Group Corporation Ltd. | Shi F.,Light Technology | Shi F.,North Night Vision Science & Technology Group Corporation Ltd. | And 9 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2015

In order to achieve graphene photocathode photoelectric conversion function, hexagonal boron nitride was doped in graphene in the form of hybrid superlattices nanoribbons. As can be seen from the band structure which was obtained by applying first-principles methods, the band gap of the superlattices was effectively regulated in a wide range (0-2.5 eV) by this means. The mechanism of band gap regulation was analyzed by the energy band structure and the charge density distribution. Furthermore, the present results were coincidence with the conclusion of Kronig-Penney model. With the increase of the h-BN proportion, the band gap engineering of graphene materials in this way, the band gap increases both zigzag edges superlattices nanoribbons and armchair edges superlattices nanoribbons. Besides, the band gap is almost independent of the width of nanoribbons, thus the size of the material can be more miniaturized. Moreover, the graphene photocathode with the gradient band gap characteristic can be made based on this approach, it can respond to different spectral ranges. © 2015, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.


Xu J.,Light Technology | Xu J.,North Night Vision Science & Technology Group Co. | Yang X.,Light Technology | Yang X.,North Night Vision Science & Technology Group Co. | And 3 more authors.
Journal of Applied Optics | Year: 2014

To solve the problem of ultraviolet imaging device sealing leakage between the photocathode and the tube body, we deeply analyzed the quality problem of the tube body InSn alloy in melting process, and found out the solder melting layer defect came mainly from the incompletely solder degassing, the basal surface oxidation and the equipment contaminated with oil. Through optimizing the process parameters, we improved the process quality and changed the indium equipment of the tube body aside solder melting into casting molten, to make the qualified rate of the tube body solder melting reache 100% and the qualified rate of gas tightness between photocathode and tube body sealing yield to 98%. ©, 2014, The No.205 Research Institute of China Ordnance Industry. All right reserved.


Xu J.,Light Technology | Xu J.,North Night Vision Science & Technology Group Co. | Yang X.,Light Technology | Yang X.,North Night Vision Science & Technology Group Co. | And 5 more authors.
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2015

Here, we addressed the problems of image distortion and slow pulse response-time of the proximity focus image intensifier with single micro-channel-plate (MCP). The negative impact of the emission conditions, including the large sheet-resistance of the semiconductor emission layer, big distances between photoemission surface and MCP front-side and between MCP back-side and screen, and low MCP gain, on image distortion and slow response-time was theoretically investigated. The effective solutions included a 10 nm semi-transparent metal layer deposited on the bottom of photo-emission layer to reduce sheet resistance; a decrease of photocathode/MCP distance from 0.4 to 0.15 mm, a reduction of screen/MCP separation from 0.8 to 0.5 mm, and a V-shaped arrangement of double-MCP assembly to shorten the pulse response-time to below 2 ns and increase MCP gain up to 106. The test results show that the newly-developed proximity focus image intensifier meets the stringent requirements in R&D of nuclear technology. ©, 2015, Science Press. All right reserved.


Shi Y.,North Night Vision Science & Technology Group Corporation | Guo Q.,North Night Vision Science & Technology Group Corporation | Li L.,North Night Vision Science & Technology Group Corporation | Deng G.,North Night Vision Science & Technology Group Corporation | And 3 more authors.
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2015

Standard InP/In0.53Ga0.47As short wavelength detectors has important application in high performance night vision owing to special spectrum response from 0.87 to 1.7 μm. In order to fully utilize the visible irradiation energy of night sky glow, the response wavelength can be extended to visible with the standard InP/In0.53Ga0.47As detector. By combining material structure design and substrate thinning processing technology, 320×256 visible-extended InGaAs wide spectrum detector were successfully prepared. Based on the detector, imagery demonstration was finished with different band filters. Different characterized information for the same target were indicated by detecting via short wavelength and visible filter respectively, at the same time, both visible and short wavelength information were obtained by widespectrum detecting without band filter, the imagery behaved as visible and short wavelength dual band detecting. Consequently, target information and the recognition rate for the target will be improved dramatically by the visible-extended wide spectrum detector. © 2015, Editorial Board of Journal of Infrared and Laser Engineering. All right reserved.

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