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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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Diffractive optical systems adapted for the outer space operation

Diffractive optical systems adapted for the outer space oper...

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conference on current developments in Lens design and optical Systems engineering

作者： Constantinov, B Pasechnic, T Sircu, S State Univ Moldova Dept Phys MD-2009 Chisinau Moldova

ISBN: (纸本)0819437387

Present paper considers a technique of diffraction element microminiaturization in the process of optical data recording onto photothermoplastic films (PTPFs) by using the photothermoplastic recording (PTPR) equipment adapted for outer space. It has been found that the application of surface - active substances (SAS) onto the free surface of PTPF facilitates the appearance and evolution of microdiffraction optical systems (whose period doesn't exceed 1 mum) on the profile of basic diffraction elements (with a period < 5 m). Miniature dimensions of microdiffraction elements provide high resolution without loss in diffraction efficiency, as the dimensions, shape (depth) of a diffraction element actually depend not only on the thickness of the visualising layer but also on SAS properties, namely on the dielectric and physical - chemical properties and, particulary, on the ability of SAS to influence onto the surface tension. The shift in the flow point of the visualising layer material provides the increase both in the diffraction efficiency and resolution at the expense of discretization of the surface diffraction elements into 2, 4, 6, ... microdiffraction elements.

关键词： photothermoplastic films surface - active materials resolution diffraction efficiency

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Assessment, optimization, and tolerancing methods for visual instruments

Assessment, optimization, and tolerancing methods for visual...

引用

conference on current developments in Lens design and optical Systems engineering

作者： Deslis, A Mouroulis, P Davidson Optron Inc W Covina CA 91790 USA

ISBN: (纸本)0819437387

A strategy for optimizing both the on-axis and the off-axis performance of coherently (directly) coupled visual instruments is presented. The strategy draws on the recently published body of data regarding the influence of various individual Seidel aberration and aberration combinations on subjective contrast sensitivity and resolution tasks, as well as studies on the correlation between subjective image quality and objective instrumental figures of merit. An MTF-based metric allows both optimization and tolerancing to be performed in a coherent manner that is based on experimental results of the effects of aberrations.

关键词： optimization visual systems optical design tolerancing MTF

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Software for tolerance analysis of optical systems

Software for tolerance analysis of optical systems

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conference on current developments in Lens design and optical Systems engineering

作者： Schuhmann, R Adams, G LINOS Photonics GmbH (Germany) The Optical Software Co. (United Kingdom)

ISBN: (纸本)0819437387

A new program for the tolerancing of optical designs is presented. This software was developed using a combination of theoretical understanding and practical experience. A comprehensive sensitivity analysis provides insight into the key parameters. Tolerance editors allow the user to define satisfactory tolerances in an interactive process involving parameter and defect variations;a key feature is the statistical prediction of system performance, which provides rapid feedback on the impact of any change. The production of a batch of optical systems under the current tolerances can be modelled in a Monte Carlo simulation;the resultant aberration variations are shown in multiple dynamic graphs.

关键词： Tolerancing Cameras Modulation transfer functions Monte Carlo methods Statistical analysis Error analysis Monochromatic aberrations Chromatic aberrations Image quality Software development

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Two-axis, optical adjustment flexure mechanism

Two-axis, optical adjustment flexure mechanism

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conference on current developments in Lens design and optical Systems engineering

作者： Bell, AD Cronin, SR ITT Ind Aerosp Commun Div Ft Wayne IN 46801 USA

ISBN: (纸本)0819437387

This technical paper describes an adjustment mechanism capable of producing microradian resolution rotational motion of an optical element. The mechanism rotates an optical element about two orthogonal axes utilizing flexure beam elements. The flexures facilitate frictionless rotation about the center of the optical element, in roll and tilt over a 1.5 degree range. The optical element is retained in an athermal mount to minimize distortion. The mechanism is constructed entirely of titanium. Integral to the mechanism is adjustment actuators to provide position adjustment of the optical element. Locking actuators retain the mechanism's final adjusted positions when exposed to severe vibration and thermal environments. The mechanism configuration may be scaled in size appropriate to the optical component requiring mounting. Although the flexure mechanism is patent pending(1), this paper presents an overview of the engineering principles utilized in precision mechanisms that the reader may be able to utilize in his or her design project.

关键词： opto-mechanical mechanism flexure roll and tilt adjustment optical component vibration stability

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Diffractive optical element for an electrooptical interface based on Photonic Mixer Device (PMD)

Diffractive optical element for an electrooptical interface ...

引用

conference on current developments in Lens design and optical Systems engineering

作者： Tai, W Schwarte, R Buxbaum, B Univ Siegen Inst Nachrichtenverarbeitung D-5900 Siegen Germany

ISBN: (纸本)0819437387

With the development of free space interconnection and optical computing different optics for these approaches have been designed, which are usually difficult to realize with conventional optical systems. The concept of an electrooptical interface based on the Photonic Mixer Device (PMD), which detects and mixes an optical signal simultaneously, has been proposed in previous publications. An array of vertical cavity surface-emitting lasers (VCSELs) is driven by input signals from different channels. The optical signals are then transformed by a lens system and a diffractive optical element (DOE) to a PMD array for processing and multiplexing. In this paper the DOE to realize the optical transformation in the electrooptical interface is presented. The DOE is composed an array of small segments, which correspond to the VCSELs with a pitch of about 250 mum. The phase functions of the DOE are designed separately for each VCSEL to generate a shifted uniform distribution on the PMD-array. For compactness the segments on the edge work at a large diffraction angle, which leads to an equivalent quasiconstant phase gradient added to them and results in high frequency structure. Therefore, for simplification of the production of the DOE, a prism is combined with the DOE to generate the desired optical transformation. The optical transformation is investigated with the simulation tool ZEMAX. The simulation results show that the DOE with the designed phase function works well for the PMD based optical interface, and it is possible to realize a parallel multi-channel electrooptical interface for code division multiplex access (CDMA) communications.

关键词： diffractive optical element interconnection Photonic Mixer Device (PMD)

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Vibration stable, ultra-precision optical adjustment Mono-Ball mechanism

Vibration stable, ultra-precision optical adjustment Mono-Ba...

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conference on current developments in Lens design and optical Systems engineering

作者： Bell, AD Joffe, B ITT Ind Aerosp Commun Div Ft Wayne IN 46801 USA

ISBN: (纸本)0819437387

ITT Industries has developed a precision optical adjustment mechanism capable of ultra-precision adjustment in microradian increments. The success of the Mono-Ball mechanism is its ability to maintain registration after sustaining harsh vibration and thermal environments. This technical paper will detail the Mono-Bah mechanism's opto-mechanical configuration. Supporting test data demonstrates the device's performance in thermal and vibration environments. This Lightweight mechanism was developed for use in spaceflight earth weather observing instruments. However, the Mono-Ball mechanism may be used in numerous optical applications that require ultra-precision adjustment. Although the Mono-Ball mechanism is patent pending(1), this paper presents an overview of the engineering principals utilized in precision mechanisms that the reader may be able to utilize in his or her design project.

关键词： opto-mechanical mechanism mono-ball roll and tilt adjustment optical component vibration stability ultraprecision

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Thermo-elastic wavefront and polarization error analysis of a telecommunication optical circulator

Thermo-elastic wavefront and polarization error analysis of ...

引用

conference on current developments in Lens design and optical Systems engineering

作者： Doyle, KB Bell, MM Opt Res Associates Westborough MA USA

ISBN: (纸本)0819437387

Loss in optical fiber coupling efficiency and transmission are computed for a telecommunication optical circulator. optical performance degradation is due to thermally induced optical errors in the two beam splitter cubes. The computation of the optical errors is discussed for two materials and the effects illustrated. Bulk, volumetric absorption of the incident laser radiation from the input optical fiber and surface absorption via the coatings on the beam splitter interface generate temperature gradients. Loss in optical fiber coupling efficiency is produced by wavefront error caused by thermal expansion effects, and refractive index changes with temperature and stress. Transmission loss in the optical circulator is caused by polarization errors generated by the effects of stress birefringence. The optical errors were computed using temperatures generated from a Thermal Desktop model and displacements and stresses generated by a MSC/Nastran finite element model. The optical errors were imposed upon a Code V optical model to compute loss in fiber coupling efficiency and transmission in the optical circulator.

关键词： beam splitter cubes wavefront error fiber coupling efficiency optical circulator stress birefringence thermo-elastic analysis

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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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Inclusion of energetic features in wavefront descriptions

Inclusion of energetic features in wavefront descriptions

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conference on current developments in Lens design and optical Systems engineering

作者： Pizarro, C Arasa, J Royo, S Tomàs, N UPC Tech Univ Catalunya Ctr Dev Sensors Instrumentat & Syst CD6 E-08222 Terrassa Spain

ISBN: (纸本)0819437387

Different wavefront description possibilities are today available to the optical designer, usually in the form of polynomial fitting (Seidel, Zernike, monomials...). This kind of representations have the general drawback of being based merely in the geometrical shape of the wavefront considered, calculated as a distribution of optical path differences, without taking into account the energetic distribution present in the wavefront. As a consequence, optimization of optical systems is carried on based only on geometrical criterions, while applications tend to rely more on energetic properties of the wavefront (detection on CCD arrays or photodiodes, image formation, etc). In this paper we are proposing a new type of wavefront descriptor which includes its energetic distribution. The description is based on classical ray tracing procedures, in such a way that in each surface normal to the axis of the optical system, information on the position (z,y) and director cosines (w,v) of the ray are known, together with the energy flux assigned to each ray (F). This allows obtaining the energetic distribution in any plane in the optical system together with the classical wavefront description based in OPD calculations, allowing to obtain complementary wavefront information. This complementary wavefront description has been applied to some simple optical systems (a large diameter cemented achromatic doublet, and a Cooke's triplet) showing how even in these very simple case the differences in the energetic distribution and the geometrical shape at the exit pupil plane are relevant. Such a fact is demonstrated by least-squares fitting of the surfaces to a monomial representation, allowing the determination of the different primary aberration coefficients. Finally, differences in the geometrical PSF and the energetic distribution calculated are plotted to show they may achieve maximum deviations of up to 11% of the PSF value for the doublet, and 25% for the triplet. In addition, t

关键词： optical design wavefront descriptor optimization radiometry

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Simulation of the optical transmission in 3-D imaging systems based on the principle of time-of-flight

Simulation of the optical transmission in 3-D imaging system...

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conference on current developments in Lens design and optical Systems engineering

作者： Tai, W Schwarte, R Heinol, H Univ Siegen Inst Nachrichtenverarbeitung D-57068 Siegen Germany

ISBN: (纸本)0819437387

A time-of-flight (TOF) system based on a novel Photonic Mixer Device (PMD), which detects and demodulates light simultaneously, has demonstrated that it is feasible to realize a 3-D imaging system with compactness, low cost and sufficient resolution for many applications. Active illumination is used in the TOF imaging system. Because of the limited available light source with large bandwidth and in consideration of eye safety, LEDs or low power laser diodes are used as preferable Light sources. The received light may be strongly damped in an order of 40-50dB, depending on the surface characteristics of the objects. Therefore the optical transmission in the light transmission chain of light source - sender lens - object - receiver lens - (PMD) detector array need to be simulated and optimized in order to achieve better performance and maximal power transmission, by the design of such a 3-D camera. Based on the modeling of the light source (laser diodes and LEDs), lens system and statistical characteristics of objects one is able to simulate the light transmission and the light distribution on the object and the PMD detector array. By the use of time-of-flight of the sensing light it is necessary to beep the phase uniformity of the illumination light, because every detector can possibly receive light from different light ways. This would result in a reduction of detection resolution. The optical-path-differences (OPD) representing the time differences from different paths have been simulated from the source to the related pixel for the designed transmitter lens and the receiver lens. Only one source is usually used by direct current modulation of laser diode or LED for uniform modulation phase. The simulation of the light distribution has given estimation of the light gathering efficiency of every pixel and of possible crosstalk between adjacent pixels.

关键词： 3-D imaging time-of-flight optical transmission Photonic Mixer Divice (PMD)

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