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浏览/检索结果: 共11条，第1-10条 帮助 限定条件 发表日期：2008    内容类型：会议论文     已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择作者升序作者降序题名升序题名降序发表日期升序发表日期降序提交时间升序提交时间降序 High power diode laser with beam coupling (EI CONFERENCE) 会议论文 Optoelectronic Materials and Devices III, October 27, 2008 - October 30, 2008, Hangzhou, China Gu Y.; Wang L.; Feng G.; Shan X.; Yin H.; Liu Y. 收藏  |  浏览/下载：52/0  |  提交时间：2013/03/25 As the increasing applications of the semiconductor lasers in the laser processing  the single 2-D stack optic-power density has not satisfied the actual requirements. It demands to couple several diode laser stack beams to one to improve the brightness  and it becomes the central issue to adopt the appropriate beam coupling technology which would offer high quality and high efficiency. In this paper  it mainly introduces the beam shaping and the technology of spatial coupling  polarization coupling  and wavelength coupling. The coupling key elements are presented and indicated. Finally  the development of the diode laser on beam coupling in our country fell behind through analyzing the statement of the world. Our lab is studying on polarization coupling and wavelength coupling. We gain some results by phase  which the polarization coupling efficiency can achieve 90% for two LD stacks with seven bars whose luminous wavelength is 975nm and980nm.By two 808nm diode laser coupling  the efficiency of 60% can be achieved after focusing to the beam size of 22mm2. 2008 SPIE.   Analysis of spectrum narrowing of diode laser bar - art. no. 68241F 会议论文 2008 Deng X. L.; Liu Y.; Yin H. G.; Feng G. Z.; Gu Y. Y.; Wang L. J. 收藏  |  浏览/下载：8/0  |  提交时间：2013/03/28 Analysis of spectrum narrowing of diode laser bar (EI CONFERENCE) 会议论文 Semiconductor Lasers and Applications III, November 12, 2007 - November 13, 2007, Beijing, China Deng X.; Liu Y.; Yin H.; Feng G.; Gu Y.; Wang L. 收藏  |  浏览/下载：7/0  |  提交时间：2013/03/25 Laser diode bar (LDB) are used increasingly often for many applications  but spectral bandwidth of LDB are generally approximately 2-4nm  far too wide for many demanding applications  e.g. spin-exchange optical pumping  terahertz generation  and lidar. External-cavity feedback can improve the spectral properties of LD or LDB. However  spectrum narrowing of LDB is more difficult than that of LD. Bar curvature (i.e. "smile") produced in the manufacturing process affects the spectrum narrowing greatly. By geometrical optics approach and ORIGIN software  smile which can be corrected by plano-convex cylindrical lens is simulated and the result is in good agreement with experiment. The selection of grating which is also a critical factor of spectrum narrowing will be stated. Finally  an external cavity consisting of fast axis collimator  two plano-convex cylindrical lens and a diffraction grating is used. The scheme is implemented on a 19-element LDB and yields 3-fold reduction in spectral linewidth under the situation that all optical elements in the system which are not optimized. Further  we use a slit in the experiment and analyze the spectrum narrowing of each element in LDB.   Detection of bone marrow metastases in spinal and pelvis: Comparison of magnetic resonance imaging with bone scintigraphy 会议论文 作者:  Shi, H.;  Gu, Y.;  Liu, W.;  Chen, X. 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/19 Relationship between serum retinol binding protein 4 and liver fat content in subjects without known diabetes 会议论文 作者:  Yan, H.;  Gao, X.;  Liu, M.;  Gu, Q.;  Zhang, B. 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/19 Leptin plays a role in ruptured human brain arteriovenous malformations 会议论文 作者:  Xie, Q.;  Chen, X. C.;  Gong, Y.;  Gu, Y. X. 收藏  |  浏览/下载：2/0  |  提交时间：2019/12/19 Brain arteriovenous malformations  leptin  intracerebral hemorrhage   Transformation from monoclinic LiMnO2 to spinel LixMn2O4 during electrochemical cycling 会议论文 5th China International Conference on High-Performance Ceramics (CICC-5), MAY 10-13, 2007 作者:  Gu, Y. J.;  Chen, Y. B.;  Wu, H. K.;  Huang, X. W.;  Liu, X. B. 收藏  |  浏览/下载：4/0  |  提交时间：2019/12/31 monoclinic LiMnO2  electrochemistry behavior  spinel-like structure  nanodomain   Effect of Mn-doping content on the microstructure and crystallite size of LiNi0.85-xCo0.15MnxO2 cathode materials 会议论文 作者:  Gu, Y.J.;  Wang, C.L.;  Cui, H.Z.;  Wu, H.K.;  Huang, X.W. 收藏  |  浏览/下载：1/0  |  提交时间：2019/12/31 Transformation from monoclinic LiMnO2 to spinel Li xMn2O4 during electrochemical cycling 会议论文 作者:  Gu, Y.J.;  Chen, Y.B.;  Wu, H.K.;  Huang, X.W.;  Liu, X.B. 收藏  |  浏览/下载：3/0  |  提交时间：2019/12/31 Effect of Mn-doping content on the microstructure and crystallite size of LiNi0.85-xCo0.15MnxO2 cathode materials 会议论文 5th China International Conference on High-Performance Ceramics (CICC-5), MAY 10-13, 2007 作者:  Gu, Y. J.;  Wang, C. L.;  Cui, H. Z.;  Wu, H. K.;  Huang, X. W. 收藏  |  浏览/下载：1/0  |  提交时间：2019/12/31 LiNi0.85-xCo0.15MnxO2  Mn-cloping  lattice parameter