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检索条件"任意字段=Conference on Current Developments in Lens Design and Optical Engineering VII"

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design of high numerical aperture Fourier objectives for holographic memory card writing/reading equipment

Design of high numerical aperture Fourier objectives for hol...

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conference on current developments in lens design and optical Systems engineering

作者： Erdei, G Fodor, J Kalló, P Szarvas, G Ujhelyi, F Optilink Hungary Ltd H-1031 Budapest Hungary

ISBN: (纸本)0819437387

A pair of special Fourier transforming objectives intended for use in a Holographic Memory Card (HMC) writing/reading equipment have been designed and fabricated. At writing in, the objectives Fourier transform a binary pattern, representing the data displayed by an SLM, into the storage medium of the HMC, where the Fourier transform is recorded as a polarisation hologram. At reading out, the objectives inverse Fourier transform the reconstructed hologram onto the surface of a CCD array. The Fourier space NA of the objectives is high enough to achieve a theoretical data density of 1 bit/mum(2) For comparison reasons we designed two optically identical objectives of basically different structures: one is an aspheric glass doublet, the other is an all-spherical five-element system (arranged in two lens groups). Computer analysis of the objectives shows that both systems are diffraction limited in object and Fourier space and have a distortion of less than 1%. In this paper we overview the theory of Fourier objectives, present our design method, describe the optical behaviour of the designed systems, show our test results performed on the fabricated aspheric objective and present our experiences at manufacturing aspheric glass lens prototypes.

关键词： optical design geometrical optics Fourier objective spherical system aspheric glass lens

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Avoiding unstable regions in the design space of EUV mirror systems comprising high-order aspheric surfaces

Avoiding unstable regions in the design space of EUV mirror ...

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conference on current developments in lens design and optical engineering V

作者： Marinescu, O Bociort, F Braat, J Delft Univ Technol Opt Res Grp NL-2628 CJ Delft Netherlands

ISBN: (纸本)0819454613

When Extreme Ultraviolet mirror systems having several high-order aspheric surfaces are optimized, the configurations often enter into highly unstable regions of the parameter space. Small changes of system parameters lead then to large changes in ray paths, and therefore optimization algorithms crash because certain assumptions upon which they are based become invalid. We describe a technique that keeps the configuration away from the unstable regions. The central component of our technique is a finite-aberration quantity, the so-called quasi-invariant, which has been originally introduced by H. A. Buchdahl. The quasi-invariant is computed for several rays in the system, and its average change per surface is determined for all surfaces. Small values of these average changes indicate stability. The stabilization technique consists of two steps: First, we obtain a stable initial configuration for subsequent optimization by choosing the system parameters such that the quasi-invariant change per surface is minimal. Then, if the average changes per surfaces of the quasi-invariant remain small during optimization, the configuration is kept in the safe region of the parameter space. This technique is applicable for arbitrary rotationally symmetric optical systems. Examples from the design of aspheric mirror systems for EUV lithography will be given.

关键词： mirror systems aspheres EUV lithography optimization relaxation

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Large volumetric optical-resolution photoacoustic microscopy with image fusion based on CNN feature extraction 22

Large volumetric optical-resolution photoacoustic microscopy...

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conference on current developments in lens design and optical engineering XXII

作者： Li, Sihang Wang, Zhuangzhuang Cao, Xiongjun Li, Zhihui Song, Xianlin Nanchang Univ Ji Luan Acad Nanchang 330031 Jiangxi Peoples R China Nanchang Univ Sch Informat Engn Nanchang 330031 Jiangxi Peoples R China

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Photoacoustic imaging(PAI) is a emerging powerful and efficient imaging technology. optical-resolution photoacoustic microscopy is an useful photoacoustic imaging technique combining the advantages of both optical imaging and acoustic imaging which obtains many attractive advanges such as high resolution, high contrast and so on. Laser beam is often focused strongly to achieve high resolution. However, this will lead to a poor depth-of-field and less structural information which limits the further application of this technology. A image fusion method based on CNN feature extraction is proposed to achieve large volumetric optical-resolution photoacoustic microscopy. First, two groups of simulated 3D photoacoustic data of different focal locations were obtained through photoacoustic microscopic imaging platform. Then B-scan data were fused and maximum projection of the reconstructed 3D data is taken to display the photoacoustic information. By comparing the source images and the fused image, we show that the proposed method can be implemented to obtain large volumetric and high-resolution photoacoustic images.

关键词： photoacoustic microscopy depth expandsion image fusion convolutional neural network

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Thermally reconfigurable varifocal silicon metalens 22

Thermally reconfigurable varifocal silicon metalens

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conference on current developments in lens design and optical engineering XXII

作者： Archetti, Anna Lin, Ren-Jie Tsoulos, Ted, V Kiani, Fatemeh Restori, Nathanael Tagliabue, Giulia Ecole Polytech Fed Lausanne STI Lab Nanosci Energy Technol LNET CH-1015 Lausanne Switzerland Univ Padua Dept Biomed Sci Neurosci I-35131 Padua Italy

ISBN: (数字)9781510644670

ISBN: (纸本)9781510644670

Active optical components are essential building blocks for a wide variety of applications such as optical communications, microscopy, and illumination systems. Reconfigurable metasurfaces, which consist of arrays of sub-wavelength meta-atoms, can be engineered to uniquely realize compact and multifunctional optical elements, enabling light-polarization dynamic-control as well as beam steering, focusing or zooming. Varifocal metalenses, in particular, have attracted increasing interests. Yet, going beyond mechanical modulation schemes to realize ultra-thin devices with fast modulation remains challenging due to the complex phase and phase-delay profiles involved. Recently, thermooptical effects in dielectric nanostructures have emerged as a promising solution to tune their optical resonances, offering unexplored opportunities for ultra-thin reconfigurable metalenses, in particular silicon based ones. In this work, we report a proof-of-concept design of an ultrathin (300 nm thick) and thermo-optically reconfigurable silicon metalens operating in the visible regime (632 nm). Importantly, we demonstrate that, using thermo-optical effects, it is possible to achieve continuous modulation of the focal-length at a fixed wavelength. In particular, operating under right-circularly polarized light, our metalens exhibits a linear focal shift from 165 mu m at 20 degrees C to 135 mu m at 260 degrees C, exceeding the lens focal depth. The average conversion efficiency of the lens is 26%, close to mechanically modulated devices, while its Strehl ratio is 0.99, confirming a diffraction-limited performance. Concurrently, in this work we report an automatized methodology to design a reconfigurable metalens, compute its layout and verify the expected performance. Overall, we envision that, by further optimization of the optical response of individual meta-atoms with machine-learning algorithms, thermally-reconfigurable silicon metalenses will emerge as a viable, chip-compatible soluti

关键词： Metasurface tunable lens varifocal metalens thermo-optic effect silicon nanofin resonator Pancharatnman-Berry geometric effect

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Development of Transmission and Receiving optical Antenna for Free Space Laser Communication 25

Development of Transmission and Receiving Optical Antenna fo...

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conference on current developments in lens design and optical engineering XXV

作者： Chen, Ching-Wei Chen, Liang-Tang Tsai, Tung-Hung Yang, Yi-Ling Huang, Ming-Tse Taiwan Space Agcy TASA 8F9 Prosper 1st RdHsinchu Sci Pk Hsinchu 300 Taiwan CALIN TECHNOL CO LTD 24 Jianguo Rd Taichung Taiwan

ISBN: (纸本)9781510679221;9781510679238

A transmission and receiving optical antenna is built-in-house by TASA and Taiwan domestic optical company CALIN. A Cassegrain type telescope is designed and manufactured with primary aperture 80 mm. It could provide the transmitted and received gain about 104 dB, and the obscuration loss about -3.8 dB in the link channel for free space optical laser communication. It could also be integrated in the CubeSat or in the optical communication terminal for small satellite missions. The root-mean-square wave front error for the optical antenna is less than 100 nm. The optical aberrations introduced on-axis WFE loss is estimated about -0.72 dB in the link budget. An eyepiece is designed to locate near the focus of telescope to collimate the output beam with beam size about 3.3 similar to 4.7 mm for propagating 50 cm distance in the follow-up communication module system. With the strong supporting domestic electro-optical industry, it is expected to help a lot on the development of the Taiwan space technology.

关键词： optical antenna link budget optical communication Cassegrain telescope wave front error

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Electrostatic Focusing System with high value of demagnification

Electrostatic Focusing System with high value of demagnifica...

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conference on current developments in lens design and optical engineering XIII

作者： Abgaryan, Artush A. Levi, Eli AISC Inc Hauppauge NY 11788 USA

ISBN: (纸本)9780819492036

For E-beam transmission and transforming we developed an electrostatic focusing device with extraordinary demagnification and abilities for 100% transmission of an electron beam with uniform distribution of current density. This experimental electrostatic focusing system consists of two sections;the first is field formation and second is field free -for measurement space(1). The purpose of this article is to present the experimental results from our electro-optical system. The measurement instrument used in the laboratory set up is an adjustable scanning system, which includes a faraday cup with a 14um diameter tungsten wire, for measuring different cross sections. The measurement of the crossover point is based on a combination of theoretical and experimental processes. The theoretical uses calculations from the " CPO"(2) program and the experimental measures different cross sections which are much larger than the diameter of the tungsten wire. Theoretically, from trajectory calculations, the crossover point is approximately 0.446 mu m. This estimation is obtained by drawing an isosceles triangle from the experimental results and comparing it to another isosceles triangle created from the theoretically calculated trajectories. Both triangles together have a geometrically proportional ratio and differ by about one percent or less. The design of the electrostatic focusing system is achieved utilizing the CGMR (Cone and Golden Mean Ratio) approach (1, 3 and 4). This system is suitable for use in X-ray tubes(5), e-beam lithography, SEM, high speed photonic technology, and also for any EOS.

关键词： Electro-optical systems CRT EBL SEM X-Ray tube electro-vacuum devices

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Ultra-precision linear actuator for optical systems

Ultra-precision linear actuator for optical systems

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conference on current developments in lens design and optical Systems engineering

作者： Nalbandian, R Moog Inc Schaeffer Magnet Div Chatsworth CA USA

ISBN: (纸本)0819437387

The Ultra-Precision Linear Actuator presented in this paper was developed for the Next Generation Space Telescope's (NGST) primary mirror surface figure control. The development was a joint effort between Alson E. Hatheway, Inc (AEH) and Moog, Schaeffer Magnetics Division(SMD)(1). The goal of this project was to demonstrate an extremely light weight, relatively high stiffness actuator capable of operating uniformly well over the range of 20 degreesK to 300 degreesK and achieving diffraction-limited performance (+/-10 nm) in the optical band for weeks at a time, while consuming no electrical power and dissipating no heat. The essence of the design challenge was to develop a lightweight, high stiffness, low power, thermally stable linear positioning mechanism. Actuation systems with resolutions comparable to that of this design normally are operated in a closed-loop control system to compensate for any non-linearities and hysteresis inherent in their enabling technologies, such as piezoelectric and magnetostrictive transducers. These technologies require continuous application of power and therefore are not low power consumption devices. The development challenge was met through the use of Alson E. Hatheway's (AEH) patented Rubicon elastic transducer(2) which consists of two elastic elements;a soft spring and a stiff flexural member. Deflection of the soft spring applies a force input to the stiff flexure, which responds with a proportionally reduced output deflection. To maintain linearity, the displacements, and hence the stresses, developed in both elastic members are kept well below the elastic yield strength of the material. The AEH transducer is inherently linear and hysteresis free.

关键词： linear actuator precision nanometer optical

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Ionic polymer metal composite to achieve optical zoom function in a compact camera

Ionic polymer metal composite to achieve optical zoom functi...

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conference on current developments in lens design and optical engineering XIV

作者： Chen, Wei-Hsiang Su, Guo-Dung Natl Taiwan Univ Grad Inst Photon & Optoelect Taipei 106 Taiwan

ISBN: (纸本)9780819496911

Nowadays, there are many popular electronic devices consist of optical focus zooming systems. It is the trend to minimize optical systems in portable devices. For this purpose, we used deformable mirrors in optical systems that can make them thinner and lighter. The Ionic-Polymer Metal Composite (IPMC) is the critical component in our design of the deformable mirror. It has good bending feature and can be driven at low voltage (less than 5 volts). The IPMC fabrication processes contain three steps: acid clean, initial compositing process and surface electrode plating process. After the IPMC is completed, we coated the PDMS on the surface to improve the surface roughness. Then we deposit silver on one side as a reflective surface to finish our deformable mirror. Some characteristics of the IPMC deformable mirror would be demonstrated in the paper. By coating the PDMS on the IPMC surface, the surface roughness can be reduced to about 20 nm. The reflection of the silver layer is up to 90%. In our design, we make the reflective optical zoom module which consists of three biconic mirrors and two deformable mirrors. When we applied voltages on deformable mirrors, the reflective light is successfully focused after the deformation of elliptic IPMC. The zoom ratio of this module can be expected to 1.8 times. The deformable mirror can be changed from flat to 65 diopters (m(-1)) by about 3 volts.

关键词： ionic polymer metal composite (IPMC) polydimethyl siloxane (PDMS) deformable mirror

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Scalable MWIR and LWIR optical system designs employing a large spherical primary mirror and small refractive aberration correctors

Scalable MWIR and LWIR optical system designs employing a la...

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conference on current developments in lens design and optical engineering II

作者： Beach, D Ind Res Ltd Auckland New Zealand

ISBN: (纸本)0819441554

design variants of a recently developed optical imaging system have been computed for the thermal infrared spectral bands, which offer some advantages for long-range surveillance and astronomy. Only the spherical primary mirror has the fall pupil diameter, all other components being sub-diameter, so scaling is possible up to relatively large pupils. Low-cost fabrication is enabled by the prevalence of spherical optical surfaces. Both MWIR and LWIR spectral transmissions are enabled by the choice of corrector materials, the examples given employing germanium and sapphire for 3.5-5.5 mum and germanium and zinc selenide for 3.5-5.5[mum and 8-12mum passbands. Diffraction at these wavelengths is the main contributor to resolution constraints, so high numerical aperture values are preferred to enable a better match of blur spot diameter to generally available pixel dimensions. The systems described can routinely be designed to have speeds of f/0.8 or faster, while maintaining diffraction-limited performance over useful angular fields. Because the new design system employs a relayed catadioptric, it is possible to make the aperture stop of the system coincident with the window of the detector cryostat, enabling precise radiometric geometry. The central obscuration provides a convenient location for a calibration source, and both this and a mask for secondary spider supports can be included within the detector cold screen structure. Dual-band operation could be enabled by inclusion of a spectral beam splitter prior to a dual relay/imager system.

关键词： MWIR imaging LWIR imaging diffraction-limited spherical mirror optics high speed wide field

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Wavefront analysis from its slope data 18

Wavefront analysis from its slope data

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conference on current developments in lens design and optical engineering XviiI

作者： Mahajan, Virendra N. Acosta, Eva Univ Arizona Coll Opt Sci Tucson AZ 85721 USA Univ Santiago de Compostela Dept Fis Aplicada Area Opt Galicia Spain

ISBN: (纸本)9781510612082;9781510612075

In the aberration analysis of a wavefront over a certain domain, the polynomials that are orthogonal over and represent balanced wave aberrations for this domain are used. For example, Zernike circle polynomials are used for the analysis of a circular wavefront. Similarly, the annular polynomials are used to analyze the annular wavefronts for systems with annular pupils, as in a rotationally symmetric two-mirror system, such as the Hubble space telescope. However, when the data available for analysis are the slopes of a wavefront, as, for example, in a Shack-Hartmann sensor, we can integrate the slope data to obtain the wavefront data, and then use the orthogonal polynomials to obtain the aberration coefficients. An alternative is to find vector functions that are orthogonal to the gradients of the wavefront polynomials, and obtain the aberration coefficients directly as the inner products of these functions with the slope data. In this paper, we show that an infinite number of vector functions can be obtained in this manner. We show further that the vector functions that are irrotational are unique and propagate minimum uncorrelated additive random noise from the slope data to the aberration coefficients.

关键词： Wavefront analysis wavefront slope data circular wavefront annular wavefront optical testing

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