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浏览/检索结果: 共6条，第1-6条 帮助 限定条件 内容类型：会议论文    专题：长春光学精密机械与物理研究所    第一署名单位    第一作者单位    通讯作者单位     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 Topology optimum structural design of the pedestal in the electro-optical theodolite 会议论文 2013 2nd International Conference on Machine Design and Manufacturing Engineering, ICMDME 2013, May 1, 2013 - May 2, 2013, Jeju Island, Korea, Republic of Wang S. Y.; Tang J.; Li H. G. 收藏  |  浏览/下载：11/0  |  提交时间：2014/05/15 Optimization analysis for radial support by finite elements method 会议论文 2012 Li C. M.; Wang Y. F. 收藏  |  浏览/下载：4/0  |  提交时间：2013/03/28 Optimization analysis for radial support by finite elements method (EI CONFERENCE) 会议论文 2012 International Conference on Intelligent System and Applied Material, GSAM 2012, January 13, 2012 - January 15, 2012, Taiyuan, Shanxi, China Li C.; Wang Y. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 Primary mirror' surface figure is affected by supporting structure obviously. Especially for large-aperture telescope  the surface figure is significant because of primary mirror' self-weight. For the requirement of the usage  it's necessary to minimize the surface figure from self-weight by reasonable supporting scheme. The text optimized support point and force of radial support to minimize the surface figure by finite-element software. At the same time  it studied the relationship between support point and counterweight to reduce the weight of support structure. At last  it gave the optimal solution. (2012) Trans Tech Publications.   Design of the infrared dual-band athermalized optical system based on HDE (EI CONFERENCE) 会议论文 International Symposium on Photoelectronic Detection and Imaging 2009: Advances in Infrared Imaging and Applications, June 17, 2009 - June 19, 2009, Beijing, China Dong K.; Zhang L.; Wang J.; Wang H.; Sun Q.; Lu Z. 收藏  |  浏览/下载：85/0  |  提交时间：2013/03/25 A dual-band infrared optical system adopting an uncooled LW infrared detector and a cooled MW infrared detector is designed and manufactured  while in the LW IR band the F/# is 1 and the focal length is 114 mm  based on the athermal ability and special diffractive properties of harmonic diffractive elements. The design shows in the MW IR band the F/# is 2 and the focal length is 72 mm  for the temperature range -40 70 the MTF value is over 0.5 at 10 lp/mm. Finite element method is applied to the opto-mechanic structure of the system for thermal analysis  for the temperature range -40C 70C the MTF value is over 0.4 at 20 lp/mm  which confirms the imaging ability of the system in a wide temperature range. 2009 SPIE.   Design of infrared afocal zoom system (EI CONFERENCE) 会议论文 ICO20: Optical Design and Fabrication, August 21, 2005 - August 26, 2005, Changchun, China Chang J.; Weng Z.; Wang Y.; Jiang H.; Cong X. 收藏  |  浏览/下载：85/0  |  提交时间：2013/03/25 The design method and result are described for an infrared afocal zoom system. Its zoom ratio is 4  (2) Functions such as changing the field-of-view  and the corresponding field of view is 3-12. The working waveband is from 7.5m to 10.5m  focusing for objects at finite distances and athermalizing the system can be achieved by axially moving a single element in the system.  and its total length is required to be no more than 350mm. The final optical system consists of 7 elements  with aspheric surfaces and a diffractive optical element. It achieves diffraction-limited imaging at the far infrared waveband. Two conclusions can be drawn from the design. (1) Using diffractive optical elements in the design of an infrared optical system is an effective approach to control color aberrations  which eliminates the need to use exotic and expensive materials and helps to reduce the cost of the system   Theoretical analysis of 980nm high power Vertical External-cavity Surface-emitting Semiconductor Laser (VECSEL) (EI CONFERENCE) 会议论文 ICO20: Lasers and Laser Technologies, August 21, 2005 - August 26, 2005, Changchun, China He C.-F.; Lu G.-G.; Shan X.-N.; Sun Y.-F.; Li T.; Qin L.; Yan C.-L.; Ning Y.-Q.; Wang L.-J. 收藏  |  浏览/下载：15/0  |  提交时间：2013/03/25 By using bottom-emitting structure  we will develop laser diode (LD) pumped 980 nm VECSEL with active region of InGaAs/GaAsP/AlGaAs system. Because the thickness of barrier layer and absorption layer exceed that of quantum well  single well approximation model (KP method) can be used to calculate the band structure of VECSEL. The Schrodinger equation of finite deep potential well can be adopted to calculate the energy level structures of electron  heavy and light holes. According to the transition selection rule  we theoretically obtained the emitting wavelength of VECSEL and calculated quasi-Femi energy of valence band and conduction band based on the analysis of energy level structure of electron and holes. By analyzing the gain of strained quantum wells  we calculated the gain of VECSEL using transition matrix elements of electron  heavy and light holes. We give out the threshold gain  output power and other characteristic parameters. We will study the configuration of VECSEL and pumping scheme. We designed external cavity mirror  active region and bottom-emitting structure. A LD-pumped vertical external cavity surface-emitting laser whose output power is greater than 1.0 W can be predicted.