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optical-SYSTEMS design FOR FOCAL-PLANE TESTING USING DIRECT WRITE SCENE GENERATION 4

OPTICAL-SYSTEMS DESIGN FOR FOCAL-PLANE TESTING USING DIRECT ...

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conference on current developments in optical design and optical engineering IV

作者： DOUB, CA CALSPAN CORP AEDC OPERATARNOLD AFBTN 37389

ISBN: (纸本)0819415871

Infrared Focal Plane Array (FPA) sensors are commonly tested using various means of scene generation. At the Arnold engineering Development Center a Direct Write Scene Generator (DWSG) is being developed. The DWSG projects the scene onto the focal plane array by scanning a rake of beams across the sensor. The rake consists of up to 256 synchronous beams generated by passing a single laser beam through an acousto-optic deflector (AOD). A complex radio frequency signal input into the AOD diffracts the laser beam into multiple beams. Each pixel of the focal plane is illuminated by one of the beams in the rake. The Direct Write Scene Generator is being designed to test a focal plane area as large as a 512 X 512 pixel array. Scan optics focus an expanded laser beam to a spot smaller than the focal plane pixel pitch over the entire test area. Several optical configurations and multiple AODs are needed to achieve the test requirements at various wavelengths. Some important considerations in the optical design are spot size, crosstalk, and background radiation.

关键词： Staring arrays lens design Acousto-optics Distortion Scanners Sensors optical design Beam steering Diagnostics Laser sources

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High power 0.98 μm broad waveguide lasers using novel material system of InGaAs/InGaAsP/AlGaAs

High power 0.98 μm broad waveguide lasers using novel mater...

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8th conference on current developments in optical design and optical engineering

作者： Yang, GW Hwu, RJ Chern, JH Xu, ZT Xu, JY Univ Utah Dept Elect Engn Salt Lake City UT 84112 USA

ISBN: (纸本)0819432652

We describe the theoretical design and experimental fabrication of high power 0.98 mu m strained quantum well lasers employing broad waveguide structure and novel hybrid material system of Al-free InGaAs/InGaAsP active region and AlGaAs cladding layers. The use of AlGaAs cladding, instead of InGaP, provides advantages in flexibility of laser structure design, simple epitaxial growth, improvement of surface morphology and laser performance. In addition to the theoretical study of the new structure, we successfully demonstrate the design by obtaining high performance laser devices. The as-grown InGaAs/InGaAsP/AlGaAs laser material exhibits very high quality with low threshold current density of 200 A/cm(2) (at a cavity length of 800 mu m), high internal quantum efficiency of similar to 93%, and low internal loss of 1.2 cm(-1). For 100 Gun-wide stripe lasers with cavity length of 800 mu m, a high slope efficiency of 1.03 W/A, low vertical beam divergence of 36 degrees, high output power of 3.65 W, and very high characteristic temperature coefficient (T-0) of 250 K are achieved.

关键词： semiconductor lasers optical structure design semiconductor epitaxial layers quantum well lasers semiconductor materials thin films

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Novel technique for measurement of centration errors of complex, completely mounted multi--element objective lenses

Novel technique for measurement of centration errors of comp...

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conference on current developments in lens design and optical engineering VII

作者： Heinisch, J. Dumitrescu, E. Krey, S. Triopt GmbH Hafenstr 39 D-22880 Wedel Germany

ISBN: (纸本)0819463671

The size and the focal length of camera objectives (e.g. cell phones or digital cameras) are becoming smaller and smaller. At the same time the quality requirements are increasing. Besides surface accuracy, the imaging quality of the complete optics is mainly influenced by the alignment errors of the single elements. TRIOPTICS has developed a new technology called Multilens((R)) in order to measure the centering errors of all single surfaces within an objective lens with up to 40 surfaces or more. We achieve accuracies in the range of an arc second. During the measurement the deviation of each center or curvature with respect to a reference axis is measured. These data are further processed in order to provide the shift and tilt of an individual lens or group of lenses in respect to a given reference axis (Patent pending Ref. 1). Applications mainly include the measurement of cell phone and digital camera lenses. However, any type of objective lens from endoscope up to very complex objective lenses used in microlithography can be measured with highest accuracy. The method has been extended to measure also the aspherical axis of lenses.

关键词： centering centration lens optical surface objective aspherical axis digital camera cell phone camera tilt shift

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Power Allocation Schemes in optical Wireless Communication 25

Power Allocation Schemes in Optical Wireless Communication

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conference on current developments in lens design and optical engineering XXV

作者： Elewah, Ibrahim A. Amer Coll Middle East ACM Dept Engn & Technol Kuwait Kuwait Amer Univ Middle East AUM Coll Engn Kuwait Kuwait

ISBN: (纸本)9781510679221;9781510679238

In this work, detailed literature about the power allocation schemes in optical wireless communication has been presented and discussed. The main goal is to evaluate the gain ratio power allocation (GRPA) and normalized gain difference power allocation (NGDPA) schemes in a 4x4 multiple-input multiple-output (MIMO) non-orthogonal multiple access (NOMA) based visible light communication (VLC) system. The work will evaluate the GRPA and NGDPA according to the system's overall achievable sum-rate and the sum-rate gain. The proposed MIMO-VLC system can utilize up to 4 subscribers regardless of their current position within the system coverage area. The work will examine the received bit rate of each user in different positions within the system coverage area. Target to maintain the same bit rate for each user, especially when the user is at the border of the system coverage area. Finally, the study will discuss the results before and after applying the power allocation schemes GRPA and NGPDA. It has been concluded the overall sum rate gain percentages after applying GRPA are lower than NGDPA, which gives the GRPA allocation scheme an advantage over NGDPA.

关键词： VLC MIMO GRPA NGDPA NOMA

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An optimized design of a scanning confocal probe

An optimized design of a scanning confocal probe

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conference on current developments in lens design and optical engineering VII

作者： Qiu, Z. R. Qin, J. Zhang, H. W. Zhang, G. X. Lu, Stephen C. Tianjin Univ State Key Lab Precis Measuring Technol & Instrume Tianjin 300072 Peoples R China Univ Southern Calif Dept Aerosp & Mech Engn Los Angeles CA 90089 USA

ISBN: (纸本)0819463671

Basing on the principle of dynamic active confocal measuring method, a non-contact probe was introduced. The relation between the displacement of the object measured and the displacement of the oscillating unit was established by applying to the measure principle. To find the effect way to improve the output signal, a mathematical modal of the photoelectric signal was proposed. According to the mathematical modal, the diameter of the pinhole was decided and the optical path was adjusted, which improved the performance of the probe. It valuable to emphasize that the double lens oscillating unit was the crucial parts of the mechanical and optical structure. The tuning fork stimulating, inductive coils and the pinhole and photodiode adjuster device were designed according to the theoretical analysis, which were more convenient to the measure task. The stability of the oscillating unit was tested;and the optical and mechanical performance of the probe was validated by experiments using gage blocks combining with a micro-motion measuring mount model. The cost of a micro-displacement testing sensor was saved in designing of this kind of probe. A more accurate signal processing method was discussed in this paper.

关键词： dynamic active confocal mathematical modal structure stability

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Full field mapping and analysis of veiling glare sources for Helmet Mounted Display systems

Full field mapping and analysis of veiling glare sources for...

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8th conference on current developments in optical design and optical engineering

作者： Hasenauer, DM Kunick, JM Opt Res Associates Pasadena CA 91107 USA

ISBN: (纸本)0819432652

The performance of an optical system can be degraded by the intrusion of stray light from sources both inside and outside of the system field of view. Stray light, or "veiling glare," can be particularly distracting in visual systems such as Helmet Mounted Display (HMD) systems. This paper describes techniques used by the authors to map stray light source positions in the far field for HMD systems and to quantitatively define their impact. The mapping can be performed over 4 pi steradians (i.e., over a full sphere) both inside and outside the system field of view. Monte-Carlo ray tracing algorithms are utilized for determining an effective source intensity distribution across the entire far field and a subtractive technique is utilized that separates the veiling glare component from the desired optical signal component. Once the major veiling glare source positions are identified, methods to reduce veiling glare can be determined. A technique for reducing noise in the calculation due to the statistical nature of the Monte Carlo ray trace is also discussed.

关键词： optical design illumination stray radiation stray light veiling glare LightTools (R)

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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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