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Large aperture phase-coded diffractive lens for achromatic and 16° field-of-view imaging with high efficiency 期刊论文  OAI收割
Chinese Physics B, 2022, 卷号: 31, 期号: 7
作者:  Ma, Gu;  Zheng, Peng-Lei;  Hu, Zheng-Wen;  Ma, Suo-Dong;  Xu, Feng
  |  收藏  |  浏览/下载：61/0  |  提交时间：2022/08/31
Method to enhance the single mode fiber coupling efficiency for obscured receiver by beam shaping 期刊论文  OAI收割
Physica Scripta, 2020, 卷号: 95, 期号: 3
作者:  Rui, Daoman;  Liu, Chao;  Chen, Mo;  Lan, Bin;  Xian, Hao
  |  收藏  |  浏览/下载：21/0  |  提交时间：2021/05/11
Optimization and Realization of Quadruple-Ridge Flared Horn With New Spline-Defined Profiles as a High-Efficiency Feed From 4.6 GHz to 24 GHz 期刊论文  OAI收割
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 2019, 卷号: 67, 期号: 1, 页码: 585-590
作者:  Dong, Bin;  Yang, Jian;  Dahlstrom, Jens;  Flygare, Jonas;  Pantaleev, Miroslav
  |  收藏  |  浏览/下载：11/0  |  提交时间：2020/03/10
Experiments on the dish verification antenna china for the SKA 期刊论文  OAI收割
EXPERIMENTAL ASTRONOMY, 2016, 卷号: 42, 期号: 3, 页码: 301-317
作者:  Chai, Xiaoming;  Liu, Bin;  Yu, Lei;  Yu, Shenghua;  Wu, Di
  |  收藏  |  浏览/下载：25/0  |  提交时间：2019/04/08
Experiments on the dish verification antenna china for the SKA 期刊论文  OAI收割
EXPERIMENTAL ASTRONOMY, 2016, 卷号: 42, 期号: 3, 页码: 301-317
作者:  Chai, Xiaoming;  Liu, Bin;  Yu, Lei;  Yu, Shenghua;  Wu, Di
收藏  |  浏览/下载：34/0  |  提交时间：2017/03/01
Yb-doped large-mode-area aluminosilicate laser fibre fabricated by chelate precursor doping technique 期刊论文  OAI收割
electronics letters, 2016, 卷号: 52, 期号: 23, 页码: 1942-u42
作者:  Peng, Kun;  Wang, Zhen;  Zhan, Huan;  Ni, Li;  Gao, Cong
收藏  |  浏览/下载：122/0  |  提交时间：2016/11/22
Effects of experimental warming on stomatal traits in leaves of maize (Zea may L.) SCI/SSCI论文  OAI收割
2013
作者:  Xu M.;  Qiu S.
收藏  |  浏览/下载：95/0  |  提交时间：2014/12/24
Annular sub-aperture stitching interferometry for testing of large asphreical surfaces (EI CONFERENCE) 会议论文  OAI收割
International Symposium on Photoelectronic Detection and Imaging, ISPDI 2007: Optoelectronic System Design, Manufacturing, and Testings, September 9, 2007 - September 12, 2007, Beijing, China
作者:  Zheng L.-G.;  Zhang X.-J.;  Deng W.-J.;  Wang X.-K.
收藏  |  浏览/下载：81/0  |  提交时间：2013/03/25
Annular subaperture stitching interferometric technology can test large-aperture  and the PV and RMS of residual error of the full aperture phase distribution is 0.027 and 0.0023  high numerical aperture aspheric surfaces with high resolution  the relative error of PV and RMS is -0.53% and -0.31%  respectively. The results conclude that this splicing model and algorithm are accurate and feasible. So it provides another quantitive measurement for test aspheric surfaces especially for large aperture aspheres besides null-compensation.  low cost and high efficiency without auxiliary null optics. In this paper  the basic principle and theory of the stitching method are introduced  the reasonable mathematical model and effective splicing algorithm are established based on simultaneous least-squares method and Zernike polynomial fitting. The translation errors are eliminated from each subaperture through the synthetical optimization stitching mode  it keeps the error from transmitting and accumulating. The numerical simulations have been carried on by this method. As results  the surface map of the full aperture after stitching is consistent to the input surface map  the difference of PV error and RMS error between them is -0.0074 and -0.00052 ( is 632.8nm)  respectively  
Research on the support structure of the primary mirror of large-aperture telescope (EI CONFERENCE) 会议论文  OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Yang W.; Jingxu Z.
收藏  |  浏览/下载：36/0  |  提交时间：2013/03/25
Large-aperture telescope can be used in surveying battlefield  researching landform  searching object  real-time monitoring  imaging  detecting and identifying spatial targets and so on. A large-aperture telescope for achieving high resolution power is designed to monitor spatial target and image in real time. Real-time monitoring plays an important role in military conflicts. The orbit parameter of object  quantity  geometrical shape parameter and so on can be obtained by detect spatial target. With the development of optical technology  people require larger aperture in optics-electronic (OE) system. By increasing optical aperture  the ability of collecting light and resolution power in the system can be enhanced. But the support structure of the primary mirror of large-aperture telescope will be a very difficult problem. With the increase of primary mirror aperture  the weight of the primary mirror will become larger than before. The root mean square (rms) of the primary mirror is affected by many factors  such as deadweight  deformation of heat  environment and so on. Due to the primary mirror of telescope is an important component of telescope system. By reducing the weight of primary mirror  precision of the system is ensured. During the designing phase  one can consider the supporting project of the primary mirror synthetically and analyze it roundly according to technical requirement of optical system and the effect factors. The final structural design can be reasonable. In an astronomical telescope  the surface of reflector is an important part for collecting dark radiation of celestial bodies. Its surface shape will have an effect on collecting efficiency of telescope radiant energy directly. So the rms must be very high. Optical system of large aperture  small wavelength and small focus can receive maximal light intensity. For ground-based optical astronomical telescope  the design proposed in the paper can satisfy the requirement of the possible minimum atmosphere seeing at astronomical observatory site and exert the use efficiency of the telescope adequately. So the accuracy of the traditional surface of reflector can assure that 90% of all the light energy can be focused on within the angle diameter range of the minimum atmosphere seeing  then 100% of light energy should be focused on the angle diameter range of minimum atmosphere seeing. Because the rms of mirror is very high  precise surface machining and accurate the support of mirror are very important tasks during designing and manufacturing the telescope. In the paper  various support techniques of a large-aperture telescope primary mirror are discussed and a 3.5 meter telescope system at the Starfire Optical Range (SOR) overviewed simply  which was operated by the Directed Energy Directorate of the Air Force Research Laboratory  Kirtland AFB  NM  USA from the ground-based O-E system for the observations of spatial target. We also analyze Theoretical elastic deformation of the Steward Observatory 2.3 meter mirror is analyzed.  
High power VCSEL device with periodic gain active region (EI CONFERENCE) 会议论文  OAI收割
Optoelectronic Materials and Devices II, November 2, 2007 - November 5, 2007, Wuhan, China
作者:  Zhang Y.;  Liu Y.;  Liu Y.;  Liu Y.;  Qin L.
收藏  |  浏览/下载：35/0  |  提交时间：2013/03/25
High power vertical cavity surface emitting lasers with large aperture have been fabricated through improving passivation  lateral oxidation and heat dissipation techniques. Different from conventional three quantum well structure  a periodic gain active region with nine quantum wells was incorporated into the VCSEL structure  with which high efficiency and high power operation were expected. The nine quantum wells were divided into three groups with each of them located at the antinodes of the cavity to enhance the coupling between the optical field and the gain region. Large aperture and bottom-emitting configuration was used to improve the beam quality and the heat dissipation. A maximum output power of 1.4W was demonstrated at CW operation for a 400m-diameter device. The lasing wavelength shifted to 995.5nm with a FWHM of 2nm at a current of 4.8A due to the internal heating and the absence of active water cooling. A ring-shape farfield pattern was induced by the non-homogeneous lateral current distribution in large diameter device. The light intensity at the center of the ring increased with increasing current. A symmetric round light spot at the center and single transverse mode operation with a divergence angle of 16 were observed with current beyond 4.8A.