CAS Changchun Institute of Optics and Fine Mechanics and Physics

Changchun, China

CAS Changchun Institute of Optics and Fine Mechanics and Physics

Changchun, China
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CAS Changchun Institute of Optics, Fine Mechanics and Physics | Date: 2014-10-27

The present invention relates to a large numerical aperture phase-shifting dual pinhole diffraction interferometer and its test method, the diffraction interferometer comprises: reference light passage, test light passage and pinhole substrate; wherein, said pinhole substrate comprises test pinhole and reference pinhole; the diffracted wavefront emitted from the test pinhole would be reflected by the optical component to be tested near the pinhole substrate and converge near the reference pinhole, and said diffracted wavefront comprising surface shape information of optical component to be tested, would be reflected by the pinhole substrate and interference with the diffracted wavefront emitted by reference pinhole, forming interference fringes. The large numerical aperture phase-shifting dual pinhole diffraction interferometer of present invention adopts a dual pinhole substrate and a illumination manner with two converged light paths, enabling the separation of the reference light and test light, to prevent the disturbance between the two light paths, which would induce the change of interferogram status during phase-shifting. By using small field interferogram optical imaging system, the present invention avoids the influence of the test light passage, and achieves a large numerical aperture test in a phase-shifting manner

Yu L.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Optics Express | Year: 2017

A novel UV-VIS-NIR imaging spectrometer prototype has been presented for the remote sensing of the coastal ocean by air. The concept is proposed for the needs of the observation. An advanced design has been demonstrated based on the Dyson spectrometer in details. The analysis and tests present excellent optical performances in the spectral broadband, easy and low cost fabrication and alignment, low inherent stray light, and high signal to noise ratio. The research provides an easy method for the coastal ocean observation. © 2017 Optical Society of America.

Li D.,Jilin University | Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Zhang H.,Jilin University | Wang Y.,Jilin University
Chemical Society Reviews | Year: 2013

Four-coordinate organoboron compounds with rigid π-conjugated structures are intensely luminescent and have high carrier mobility which enables them to be applied in optoelectronics including organic light-emitting diodes (OLEDs), organic field-effect transistors, as well as photoresponsive, sensory and imaging materials. Various chelate ligands and boron moieties have been explored to construct proper electronic structures and suitable molecular arrangements, which play important roles on the photophysical and electronic properties of the four coordinate boron compounds. These efforts have produced a number of fascinating molecules, some of which have exhibited high performance as light emitting materials. In this article, we provide an overview of the progress in the molecular construction of four-coordinate organoboron compounds with an emphasis on their applications in OLEDs. This journal is © The Royal Society of Chemistry 2013.

Li D.,CAS Changchun Institute of Optics and Fine Mechanics and Physics | Stockman M.I.,Georgia State University
Physical Review Letters | Year: 2013

We consider theoretically the spaser that is excited electrically via a nanowire with ballistic quantum conductance. We show that, in the extreme quantum regime, i.e., for a single conductance-quantum nanowire, the spaser with a core made of common plasmonic metals, such as silver and gold, is fundamentally possible. For ballistic nanowires with multiple-quanta or nonquantized conductance, the performance of the spaser is enhanced in comparison with the extreme quantum limit. The electrically pumped spaser is promising as an optical source, nanoamplifier, and digital logic device for optoelectronic information processing with a speed of ∼100 GHz to ∼100 THz. © 2013 American Physical Society.

Zhang J.-X.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2012

The developing status of large aperture ground-based telescopes is reviewed in this paper. The significance of bigger apertures for telescopes and their main technological approaches are expatiated and the summary on appliance values of modern large aperture telescopes is given. Then, it introduces five kinds of modern typical large telescope systems, which represent the topmost technological level. The key structures and technologies of large telescopes about mount, telescope tubes, primary mirror supports and secondary mirror assemblies are disscussed. Finally, it summarizes the developing trends of the large aperture ground-based telescopes and points out that some of the optical systems in the telescopes have been changed from coaxial systems to off-axial systems, while they are better application prospects.

Xue Q.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Applied Optics | Year: 2011

A low-cost, broadband, astigmatism-corrected Czerny-Turner arrangement with a fixed plane grating is proposed. A wedge cylindrical lens is used to correct astigmatism over a broadband spectral range. The principle and method of astigmatism correction are described in detail. We compare the performance of this modified Czerny-Turner arrangement with that of the traditional Czerny-Turner arrangement by using a practical Czerny-Turner imaging spectrometer example. © 2011 Optical Society of America.

Wang X.-K.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

For the purpose to decrease the misalignment error from a testing aspheric surface by Subaperture Stitching Interferometry(SSI), a translated error compensation method is proposed to subtract the misalignment error from each phase detum and to stitch multi-subapertures precisely. The basic principle and process of the method are researched, and a compensation mode is established based on the mode search algorithm. The experiment is carried on for an off-axis SiC aspheric mirror with a clear aperture of 230 mm×141 mm, the phase data of the whole aperture are stitched precisely and the figure error is compensated by eliminating the misalignment error. For the comparison and validation, the asphere mirror is also tested by null compensation method, and the relative errors of PV and RMS are 0.57% and 2.74%, respectively.

Sun H.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

On the basis of the characteristics of an airborne electro-optical platform, six coordinate systems were established and eight linear coordinate transformations were performed. A coordinate transformation model from a camera sensor plane to geodetic coordinate systems was established by using linear coordinate transformation, and the computation formula of geodetic coordinate of the target was derived based on the transformation of different coordinates. The influence of target localization due to various error factors was discussed, and the localization error was analyzed with Mont Carlo method. The experimental results show that the target location is affected by aircraft position errors, aircraft attitude errors and EO platform pose errors, among which the aircraft position errors are transferred directly into the target location, and the aircraft attitude errors and EO platform pose errors are tranferred scaling with the range of 10-4~10-2 to the target location. This method is efficient and useful to the localization of targets for airborne EO platforms.

Wang R.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Chinese Optics | Year: 2013

A compound guided system by combining the laser 3D active imaging and passive IR imaging was proposed to improve the operational effectiveness for air-ground missiles and the recognition ability for IR stealthy targets. The detail design program and reasonable guided strategy were also given. This system has the ability of IR wide field searching and laser 3D imaging in a narrow field and its abundant image information makes the operational object recognition more easy. The structure of the whole system is simple and easy to process. When the aperture of the compound guided system is limited at about 100 mm, the guided distance is longer than 4 km. This technology is important to develop compound guided systems and improve the missile operational ability in our country.

Wang X.-J.,CAS Changchun Institute of Optics and Fine Mechanics and Physics
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2012

High-resolution photoelectric encoder usually achieves a high resolution by the subdivision of two-way orthogonal sine and cosine signals from a fine disk code. In order to improve the subdivision technology, this paper researches the subdivision errors specially. The signal DC component errors, magnitude errors, phase errors, harmonic errors, noise errors and quantization errors are analyzed, respectively. Based on properties of subdivision errors, the laws of errors and their computing formulae are obtained, then, the fairly complete mathematical results of subdivision errors and precision analysis for photoelectric encoders are formed. The results show that the subdivision precision is about 1.5% generally. It points out that it should pay more attention to the effects of subdivision errors on different technological steps such as code selection, axis design, signal extraction, circuit design and adjusting method, when the subdivision is used to improve the encoder accuracy. The research results are useful for analyzing and distributing errors, forecasting product accuracy and reducing design errors in the product design.

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