中国科学院机构知识库网格系统: 检索

Three tailorable optical vortices generated by a modified fractal spiral forked plate 期刊论文 OAI收割
Journal of Optics (United Kingdom), 2021, 卷号: 23, 期号: 4
作者: Xia, Tian; Cheng, Shubo; Yu, Weixing; Tao, Shaohua

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收藏 | 浏览/下载：41/0 | 提交时间：2021/05/07

modified fractal spiral forked plate self-similar optical vortices three tailorable coplanar optical vortices topological charge transformation rule

Free-vibration modes of an annular mirror for the optical aberration representation 期刊论文 OAI收割
JOURNAL OF ASTRONOMICAL TELESCOPES INSTRUMENTS AND SYSTEMS, 2019, 卷号: 5, 期号: 2, 页码: 6
作者: Wang, Hairen; Zuo, Yingxi; Zheng, Xianzhong; Yang, Ji

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收藏 | 浏览/下载：92/0 | 提交时间：2019/10/21

free-vibration modes optical aberrations Zernike polynomials thin plate theory

High-performance etching of multilevel phase-type Fresnel zone plates with large apertures 期刊论文 OAI收割
Optics Communications, 2018, 卷号: 407, 页码: 227-233
作者: Guo, C. L.; Zhang, Z. Y.; Xue, D. L.; Li, L. X.; Wang, R. Q.

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收藏 | 浏览/下载：25/0 | 提交时间：2019/09/17

Fresnel zone plate Diffractive optical elements Etching depth uniformity Ion beam etching Dwell time algorithm dwell-time algorithm dielectric gratings fabrication errors x-ray ion Optics

Design and Practice Multi-channel Real Time System on Deformation Control of Optical Plate 会议论文 OAI收割
Amsterdam, Netherlands, 2012-7-1
作者: LI Xin-nan; ZHENG Yi; LI Ying; Wang Yin-hu

收藏 | 浏览/下载：131/0 | 提交时间：2014/01/09

optical plate deformation control real time MIMO system

The design of computer-generated holograms for testing unsymmetrical optical surfaces (EI CONFERENCE) 会议论文 OAI收割
2012 International Symposium on Photonics and Optoelectronics, SOPO 2012, May 21, 2012 - May 23, 2012, Shanghai, China
作者: Zhang X.; Zhang Y.; Zhang X.; Zhang X.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

It is a technical difficulty to test the unsymmtrical optical surfaces in non-contact methods. But we can do it using computer-generated holograms (CGH). The principle and design of the CGH have been discussed in the paper. Take the cubic suface as an example The order separation of the CGH is analyzed theoretically and the simulation result of the order separation is given in the paper. We develop the binary process of the continuous CGH phase function and get the sample of the amplitude CGH. A CGH for testing a cubic phase plate with duty cycle 0.5 is fabricated by using e-beam lithographic techniques. In this situation the contrast of the interference fringe pattern can achieve a level of 99.4% by calculation. 2012 IEEE.

Technology of polarization interference imaging spectral based on pupil division and angle shear 期刊论文 OAI收割
acta physica sinica, 2012, 卷号: 61, 期号: 23
作者: Tang Qian; Zhao Bao-Chang; Qiu Yue-Hong; Zhang Chun-Min; Mu Ting-Kui

收藏 | 浏览/下载：38/0 | 提交时间：2015/07/02

new optical sensing technology technology of imaging polarization spactrum Wollaston prism Savart plate

The investigation of point defect modes of phononic crystal for high Q resonance (EI CONFERENCE) 会议论文 OAI收割
2011 16th International Solid-State Sensors, Actuators and Microsystems Conference, TRANSDUCERS'11, June 5, 2011 - June 9, 2011, Beijing, China
作者:

收藏 | 浏览/下载：23/0 | 提交时间：2013/03/25

Point defect cavity was constructed in a two-dimensional phononic crystal plate. It was excited by a small piezo chip in the cavity and the vibration of each point defect modes were detected by an optical interferometer. Point defect modes on 2D PC plate in vacuum air and loaded with water were investigated theoretically and experimentally to make clear of Q factors which are affected by inner attenuation band gap effects and medium. The way to get high Q resonance has been found. It helps to design a new kind of resonator or sensor. 2011 IEEE.

Application of particulate reinforced aluminum matrix composite in airborne photoelectric turret (EI CONFERENCE) 会议论文 OAI收割
2011 International Conference on Electric Information and Control Engineering, ICEICE 2011, April 15, 2011 - April 17, 2011, Wuhan, China
作者: Wang P.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

In order to design and manufacture more excellent airborne photoelectric stable turret modulus of elasticity of 213 GPa and thermal expansion coefficient of 7.9106/K. The frame has decreased the maximum deformation by by 60% and increased the fundamental frequency by 65% as compared with those of aluminum alloy materials a new type of aeronautical material-particulate reinforced aluminum matrix composite (SiC/Al composite) is investigated. Several crucial technologies respectively as shown by finite element analysis results. Those are confirmed by vibration test furthermore. Therefore such as pressureless infiltration technology a significant lightening effect is achieved and the thermal control load is also reduced. The test result indicates that the stable accuracy of the system achieves 19.8rad and the optical-axis parallelism of pay load is 0.1mrad. The research applies the SiC/Al composites to airborne photoelectric platforms interface reaction controls and plate's welding are systematically studied. Then which makes a effective exploration for the new aeronautical material's application. 2011 IEEE. using SiC/Al composites the airborne photoelectric stable turret frame is successfully prepared in density of 2.94 g/ cm3

Mechanism of STED microscopy and analysis of the factors affecting resolution (EI CONFERENCE) 会议论文 OAI收割
6th International Symposium on Precision Engineering Measurements and Instrumentation, August 8, 2010 - August 11, 2010, Hangzhou, China
Yang P.; Ai H.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

Stimulated emission depletion (STED) microscopy exploits nonlinear saturable optical transition of fluorescent molecules allowed to overcome Abbe's diffraction-limit and provides diffraction-unlimited resolution in far-field optical microscopy. We elaborate the mechanism of STED and the conditions of depletion. The formula of STED microcopy resolution is deduced through effective point spread function (E-PSF). The STED system resolution is mainly dominated by the quality of the fluorescence depletion patterns in the focal plane. The depletion pattern is mainly affected by STED beam intensity polarization phase plate primary aberrations STED pulse shape pulse duration and delay time. In this paper we found related models and simulate the relationship between the depletion patterns and the parameters and put forward effective approach to enhance the system resolution. 2010 SPIE.

Design and image restoration research of a cubic-phase-plate system (EI CONFERENCE) 会议论文 OAI收割
5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, April 26, 2010 - April 29, 2010, Dalian, China
作者: Zhang J.; Zhang J.; Zhang J.; Shi G.; Zhang X.

收藏 | 浏览/下载：32/0 | 提交时间：2013/03/25

Wave-front coding technology is a novel jointly optical and digital imaging technology which can greatly extend the depth of focus of optical systems. The image restoration process is an important part of wave-front coding technology. Using wave-front coding makes the modulation transfer function(MTF) values of the optical systems change little over a range of several times the depth of focus which means the system MTF is quite insensitive to defocus and there is no zero in the passband. So we can design a single filter for the restoration of images in different defocus positions. However it's hard to avoid noise during image acquisition and transmission processes. These noises will be amplified in the image restoration especially in the high frequency part when the MTF drop is relatively low. The restoration process significantly reduces the system signal to noise ratio this way. Aimed at the problem of noise amplification a new algorithm was proposed which incorporated wavelet denoising into the iterative steps of Lucy-Richardson algorithm. Better restoration results were obtained through the new algorithm effectively solving the noise amplification problem of original LR algorithm. Two sets of identical triplet imaging systems were designed in one of which the cubic-phase-plate was added. Imaging experiments of the manufactured systems were carried and the images of a traditional system and a wave-front coded system before and after decoding were compared. The results show that the designed wave-front coded system can extend the depth of focus by 40 times compared with the traditional system while maintaining the light flux and the image plane resolution. 2010 Copyright SPIE - The International Society for Optical Engineering.