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

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design and analysis of a spaceborne lidar telescope

Design and analysis of a spaceborne lidar telescope

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conference on current developments in optical design and engineering V

作者： FENG, C AHMAD, A AMZAJERDIAN, F UNIV ALABAMA CTR APPL OPTHUNTSVILLEAL 35899

ISBN: (纸本)0819418994

A spaceborne telescope has been designed and analyzed for a 2-micron solid state coherent lidar system operating on a satellite. The optical system consists of a large off-axis reflective telescope, a large-aperture diffractive scanner, an image derotator and a lag angle compensator. Due to the orbiting motion of the satellite and scanning, the boresight of the telescope shifts during the round trip travel time of the laser pulses to the target. In a coherent lidar system utilizing optical heterodyne detection, the relative alignment of the received signal with respect to the local oscillator beam is particularly critical. Two compensators have been designed to correct the boresight errors as well as the wavefront errors caused by beam wandering due to the boresight changes. Several design approaches for the compensators have been investigated. The optical and optomechanical design issues for such a system are discussed. The results of optical performance, modeling, and tolerance analysis for the telescope are also presented.

关键词： optical design AND MODELING LARGE REFLECTivE OPTICS DIFFRACTivE OPTICS TOLERANCE ANALYSIS BORESIGHT SHIFT COMPENSATION LIDAR COHERENT LASER RADAR SATELLITE

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Variable gratings for optical switching: rigorous electromagnetic simulation and design

Variable gratings for optical switching: rigorous electromag...

引用

conference on current developments in optical design and engineering VII

作者： Gani, D Auslender, M Hava, S Ben Gurion Univ Negev Dept Elect & Comp Engn IL-84105 Beer Sheva Israel

ISBN: (纸本)0819428841

This paper is devoted to the analysis of the optical performance of movable-beam grating structures with both lateral and vertical displacement of the beams. We show that in the vector- diffraction domain one can design high-efficiency switches (e.g. between beam transmitter and beamsplitter mode) and modulators for polarized radiation. The devices exhibit a good tolerance to fabrication and mounting errors and a functional flexibility. In addition, by simulating the optical performance of polysilicon micro-electro-mechanical grating structures at a visible wavelength, reported in the literature, we demonstrate that our tools for rigorous electromagnetic simulation of grating structures work well in the scalar-diffraction domain.

关键词： variable grating devices silicon diffraction rigorous electromagnetics

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designing Aspherics with discrete representation

Designing Aspherics with discrete representation

引用

conference on current developments in Lens design and optical engineering III

作者： Wei, N Gong, MI Yan, P Zhang, HT Tsing Hua Univ Dept Precis Instrument Digital Photon Lab Beijing 100084 Peoples R China

ISBN: (纸本)0819445347

We have developed a new method other than traditional technique based on ray tracing and optimization algorithm to design arbitrary aspherics. Analytic definition of the aspheric surfaces is done away with and numerical solution of nonlinear difference equations called Aspheric Intrinsic Equations (AIE) is implemented instead. Simulation results compared with traditional optical design software are presented, which prove that this new method is more effective and reliable in designing aspheric surfaces.

关键词： aspherics discrete representation optical disk lens design

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optical design of triple-mode seeker 11

Optical design of triple-mode seeker

引用

conference on current developments in Lens design and optical engineering XXI

作者： Sakarya, Dogan Ugur Kucukcelebi, Doruk Tact Missile Syst Grp TR-06780 Roketsan Elmadag Ankara Turkey

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In missile applications, new counter measure methods are getting more complex. To discriminate and detect counter measure and to understand target signature from scene is getting harder. Because of all that concerns, using triple-mode seeker for a system solution is a good solution for system total performance. By this way, tri-different wavelength could be used for same system and same scene. In this study, triple mode system's optical designs have been made for mid-wave infra-red imaging, long-wave infra-red imaging and short-wave infrared imaging. optical designs performances have been illustrated in simulation results. Finally, conceptual design of triple mode seeker will be summarized.

关键词： Triple mode seeker mid wave infrared long wave infrared short wave infrared optical design

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optical design for Terrestrial Planet Finder

Optical design for Terrestrial Planet Finder

引用

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

作者： Noecker, MC Leitch, J Kopp, G McComas, B Ball Aerosp & Technol Corp Boulder CO 80306 USA

ISBN: (纸本)0819432652

We describe the features of the optical system for Terrestrial Planet Finder, a space-based, cryogenic (35 K) interferometer for direct detection of Earth-type planets around nearby stars. Destructive interference in a stellar interferometer suppresses stellar glare by a factor of several thousand or more, and phase chopping distinguishes planet light from symmetric backgrounds. The mid-infrared (7-20 mu m) is favorable for detecting planetary emission relative to that from the star, and this spectral region also offers important molecular signatures indicative of key atmospheric gases.

关键词： Planets Interferometers Mirrors Nulling interferometry Stars Space telescopes Telescopes Space operations Beam splitters Sensors

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Changing field of view by applying voltage difference 23

Changing field of view by applying voltage difference

引用

conference on current developments in Lens design and optical engineering XXIII Part of SPIE Optics and Photonics conference

作者： Sakarya, Dogan Ugur Roketsan Tact Missile Syst Grp TR-06780 Ankara Turkey

ISBN: (纸本)9781510654198;9781510654181

Dual field of view optical systems provide search, detect and observation abilities with wide and narrow field of views. These systems provide dual field of view by changing the effective focal length with moving a lens or lens group mechanically to exact positions. In this paper, previously proposed methodology is used to change effective focal length without any mechanical movement. This methodology relies on ionization of fluid with voltage difference to change the refractive index which is patented in 2022.

关键词： Observation system field of view zoom lens design voltage difference solution ionization

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design for adjustable optical system of liquid filled lens

Design for adjustable optical system of liquid filled lens

引用

conference on current developments in Lens design and optical engineering Xiv

作者： Shaw, Dein Hsieh, Hui-An 101 Sect 2Kuang Fu Rd Hsinchu 30013 Taiwan

ISBN: (纸本)9780819496911

In this research, an optical integrated module including a liquid-filled lens, a flexible sensor membrane and a self-adjusted optical compensation component was designed. We studied the optical relationship (which is called compensation function) between the liquid-filled lens and the sensor membrane to make the system has good optical characters. According to compensation function, this module compensates the optical character between lens and sensor membrane to obtain a clear image by adjusting the internal pressure and volume of the liquid in the liquid filled optical system. For a single lens optical system, the curvy sensor membrane has better performance than flat type sensor in off optical axis due to Petzval surface is curved. An optical experiment was set up to measure the performance of the module to prove the idea, and the results show that the module achieves the desired effect.

关键词： liquid-filled lens flexible sensor membrane optical module self-compensation PDMS

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The entrance pupil of an on-axis stigmatic singlet lens 11

The entrance pupil of an on-axis stigmatic singlet lens

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conference on current developments in Lens design and optical engineering XXI

作者： Gonzalez-Acuna, Rafael G. Gutierrez-Vega, Julio C. Tecnol Monterrey Photon & Math Opt Grp Monterrey 64849 Mexico

We derive a closed-form expression for the entrance pupil of the on-axis stigmatic singlet lens, and discuss its performance for a variety of conditions, including positive or negative indices of refraction, and diffe... 详细信息

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

关键词： optical design spherical aberration telescopes aberration theory

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Spatial resolution of an optical microscope with oblique illumination 20

Spatial resolution of an optical microscope with oblique ill...

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conference on current developments in Lens design and optical engineering XX

作者： Borovytsky, Volodymyr Natl Tech Univ Ukraine Igor Sikorsky KPI Opt Engn Dept Pr Peremogy 37 UA-03056 Kiev Ukraine

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

This paper presents the theory for numerical evaluation of the spatial resolution along an optical axis of an optical microscope in case of oblique illumination. It considers the optical setup with a coherent light source, a microscope condenser, a grating located in a plane with an optical axis and with grating slits perpendicular to this axis and a microscope objective. It is proposed the analytical expression for calculation of the minimal resolvable period of this grating or the corresponded spatial cutoff frequency that characterizes the spatial resolution along the optical axis. It is demonstrated that this spatial cutoff frequency is not proportional to the angle of beam inclination. The proposed theory clearly explains why an optical microscope has the limited spatial resolution along an optical axis and how illumination can maximize this resolution.

关键词： Fourier optics image formation diffraction theory optical microscopy spatial resolution Abbe theory optics education spatial cutoff frequency spatial bandwidth

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optical design of athermalised dual field of view zoom lens in long wave infrared (8μm-12μm) spectral band using benefits of paraxial optics 17

Optical design of athermalised dual field of view zoom lens ...

引用

conference on current developments in Lens design and optical engineering XVII

作者： Kucukcelebi, Doruk Roketsan TR-06780 Ankara Turkey

ISBN: (数字)9781510602861

ISBN: (纸本)9781510602854;9781510602861

This paper presents a methodology for designing an athermalised dual field of view zoom lens in long wave infrared (8 mu m - 12 mu m) spectral band by using the benefits of paraxial optics. By using this design methodology the optical designer can develop many types of complex optical systems in a straightforward way. The key feature of this design methodology relies on utilization of paraxial optics for defining the initial positions of the optical elements. The optical design is based on moving a single lens for changing the optical system's FOV thereby reducing the number of moving parts and simplifying the assembly procedure of the system. The optical design begins with optimization process using paraxial optics. Then the optical design using paraxial optics is used as a template for designing the final optical system by lens material selection for compensating the shift in system's focus due to thermal effects and lens thickness tuning.

关键词： Dual FOV optical design paraxial optics athermalization Long Wave Infrared (LWIR)

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