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| 1 | Experimental demonstration of the three-phase-shifted DFB semiconductor laser with buried heterostructure using common holographic exposure显示文摘In this article,we report the first experimental demonstration of the three-phase-shifted(3PS)DFB semiconductor laser with buried heterostructure based on the Reconstruction-Equivalent-Chirp(REC)technique.The simulation results show that the performances of the equivalent 3PS DFB semiconductor laser are nearly the same as those of the true 3PS laser.Compared with the quarter-wave-phase shift(QWS)DFB semiconductor laser,the 3PS DFB semiconductor laser shows better single-longitude-mode(SLM)property even at high injection current with high temperature.However,it only changes theμm-level sampling structures but the seed grating is uniform using the REC technique.Therefore,its fabrication cost is low. | LU LinLin CAO BaoLi ZHANG LiBo TANG Song LI LianYan LI SiMin SHI YueChun CHEN XiangFei | 2014 | Science China(Technological Sciences)2014，57，11： | 4 |
| 2 | Comparative Study on the Infrared Radiance Field of Building Surface under Sunshine Conditions and Rainfall Conditions显示文摘The Monte Carlo method and the region method are combined in this paper,where a high-rise building in Harbin were taken for example to investigate the infrared radiation field of building surface.The calculation models of temperature field and radiation transfer coefficient on the exterior surface were established.Through the self-built Bidirectional Reflectance Distribution Function(BRDF)experimental device,the BRDFs of moorstone,aluminum plate,coated glass and Ethylene-Propylene-Diene Monomer(EPDM)on the surfaces under dry and wet conditions were measured at different incidence angles with respective laser wavelengths of0.6328μm and 1.34μm.For the two wavelengths,the reflection ratios of the material surfaces under dry and wet conditions were calculated respectively.Based on some proper simplifications of the background condition,the simulation analysis of the radiation field of building surface was carried out according to the wetness theory and the measured data.Taking the situation at 9:00 a.m.on the day of summer solstice as an example,this paper made relevant quantitative calculation for the solar radiation,the self radiation of the surface units,the radiating projection between the surface units,and the general infrared radiation of the building surface.Comparisons on infrared radiance field of the building surface were obtained under cloud-free sunshine conditions and rainfall conditions respectively,and the rationality of the results was discussed. | Ming Xie Hai-Qiang Wang Xiao-Chen Xie Xiao-Chun Wang He-Ping Tan | 2013 | Journal of Harbin Institute of Technology(New Series)2013，20，4： | 0 |
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