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浏览/检索结果: 共5条，第1-5条 帮助 已选(0)清除 条数/页：5101520253035404550556065707580859095100   排序方式：请选择发表日期升序发表日期降序作者升序作者降序提交时间升序提交时间降序题名升序题名降序 A wide-FoV athermalized infrared imaging system with a two-element lens 期刊论文 Infrared Physics and Technology, 2017, 卷号: 87, 页码: 11-21 作者:  Shi ZL(史泽林);  Zhao YH(赵耀宏);  Liu HZ(刘海峥);  Liu, Li;  Feng B(冯斌) 收藏  |  浏览/下载：26/0  |  提交时间：2017/11/15 Infrared imaging  Wide field of view  Athermalization  Two-element lens   Discussion on the improved diffractive superresolution element of the two-photon microfabrication 会议论文 International Technology and Innovation Conference 2006. ITIC 2006, International Technology and Innovation Conference 2006. ITIC 2006, Hangzhou, China, INSPEC Wei Peng; Zhu Yu; Tan QiaoFeng; Duan GuangHong 收藏  |  浏览/下载：5/0 Imaging analysis of a novel compound diffractive telescope system (EI CONFERENCE) 会议论文 Optical Manufacturing and Testing VIII, August 4, 2009 - August 5, 2009, San Diego, CA, United states Yue J.; Lu Z.; Liu H.; Xu W.; Zhang H.; Zhang H.; Liu Y. 收藏  |  浏览/下载：27/0  |  提交时间：2013/03/25 The main feature of the compound diffractive telescope is the combination of diffractive optics with compound structure arranged eyepieces. In this paper  a design of the compound diffractive telescope is firstly introduced  and a 4.2 FOV is obtained with one primary lens and twenty-one eyepieces. Secondly  image characteristic of different channels is analyzed with the design wavelength in ASAP  and one modified phase function model of diffractive optical element is introduced to analyze the MTF curves for 0 FOV  which provides a more accurate prediction of the performance of the system. Then the system is tested by the star image test  and the diffraction limit images are got within 2 FOV. And finally  two pictures taken from the adjacent FOV proved to be able to be spliced together. All the results above demonstrate that a good performance of the compound diffractive telescope. 2009 SPIE.   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：10/0  |  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.   Design of dual-FOV refractive/diffractive LWIR optical system (EI CONFERENCE) 会议论文 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Advanced Optical Manufacturing Technologies, July 8, 2007 - July 12, 2007, Chengdu, China Zhang J.-P.; Wang L.-J.; Zhang X. 收藏  |  浏览/下载：22/0  |  提交时间：2013/03/25 An infrared-optical zoom system using binary element is proposed in this paper. The two main advantages of the zoom system introducing here are: bigger F-number and lower cost. The primary optical properties are: F/#=1  Second  Others  zoom ratio =1:4  binary element is used to correct the chromatical aberration by taking the advantage of negative dispersion characteristics and the cost of the system is lower than that of conventional ones with Zinc Selenide (Znse) material at the same level. In the binary element is rotational symmetric with one step which is easy to fabricate  in order to balance 5th spherical aberration  and dual field are 26.6 and 5.6respectively. Wider field of view is used for search and the smaller one is used for imaging details. This system uses un-cooled infrared detector with 320240 pixels and 45m pixel size. The F-number matches the sensitivity range of the detector array. Three aspects are considered during design process to make the system more satisfactory and more achievable. First  5th coma aberration and 5th astigmatic aberration  the manner of zoom is accomplished by exchanging tow lenses into the smaller field of view system layout. The lens exchange manner faces the requirement of simple system structure and good image quality in both focal points. It can also make the system more feasible in the alignment process than mechanical-zooming manner and optical-zooming manner  high-order asphere surfaces with 2th order to 10 th order are also hired in the system. Asphere surface is useful in compressing the system and improving optical system transmittance. This kind asphere surface is on industrial level featuring low cost and easy to fabricate. It is shown that good image quality can achieved by implementing five Germanium lenses and the transmittance of system is 72%. All aberrations are diffraction-limited  both spherical aberration and astigmatic aberration are corrected. When the field of view(FOV) is 26.6 and the focal length is 152mm  MTF at Nyquist frequency(11lp/mm) is great than 0.7. The spherical aberration is -0.0073. The coma aberration is 0.0978 and the astigmatic aberration is -0.013. When the field of view(FOV) is 5.6 and the focal length is 38mm  MTF at Nyquist frequency is great than 0.8 with spherical aberration -0.0046  the coma aberration 0.055 and astigmatic aberration 0.034.