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Comparison of passive athermalization results of LWIR optical designs utilizing different infrared optical materials 11

Comparison of passive athermalization results of LWIR optica...

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conference on current developments in Lens design and optical engineering XXI

作者： Kucukcelebi, Doruk Sakarya, Dogan Ugur Kemalpasa Mahallesi Sehit Yuzbasi Adem Kutlu TR-06780 Ankara Turkey

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

In this paper, different optical designs, which are composed of different LWIR optical materials, are utilized for passive athermalization and their performance in athermalization are analyzed. The optical designs are carried out by preserving the athermal property as well as keeping the image quality at higher levels within the working temperature between -40 degrees C and +60 degrees C. Our designs consist of two different infrared optical elements to maintain the focus positions as stable as possible within the working temperature. The passive athermalization process begins with the calculation of athermalization conditions of candidate material properties. By taking into account these conditions, athermal material pairs are chosen. The optical design begins with an optimization process using paraxial optics. In order to reduce aberrations such as coma, astigmatism, spherical and chromatic, aspherical surfaces are utilized during the optimization process. At the end of the design phase, the performance of different configurations of athermal optical material pairs, which are enclosed by aluminum alloy housing material, are presented.

关键词： Athermalization infrared optical design two-element optical material pair Long Wave Infrared (LWIR)

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New infrared optical systems using diffractive optics

New infrared optical systems using diffractive optics

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conference on current developments in Lens design and optical engineering III

作者： Bigwood, C Thales Opt Ltd St Asaph LL17 0LL Denbigh Wales

ISBN: (纸本)0819445347

A method for computing the polychromatic MTF of hybrid refractive - diffractive elements is described taking into consideration the effects of not only the primary diffraction order but also the effects of additional parasitic diffraction orders. The results of this approach are compared with the more conventional single order calculation and with actual measured performance. For certain markets and applications the cost of infrared lenses are critical in order to achieve customer expectations. Two possible methods of realising this requirement are the use of moulded optics or the use of multiple kinoform optics with no refractive power. Examples of such lenses are given along with discussion of the merits and limitations that each approach entails.

关键词： optical design infrared diffractive optics

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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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design of an anastigmatic three-mirror telescope using freeform surfaces 11

Design of an anastigmatic three-mirror telescope using freef...

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conference on current developments in Lens design and optical engineering XXI

作者： Alvarado-Martinez, J. J. Granados-Agustin, F. S. Vazquez-y Montiel, S. Cornejo-Rodriguez, A. A. INAOE Luis Enrique Erro 1 Sta Maria Tonanzintla Cholula Pue Mexico UIEPA Los Ilanos Kilometro 1 San Andres Tlayehualanci Ahuacatlan Pue Mexico

ISBN: (数字)9781510637719

ISBN: (纸本)9781510637719

This paper proposes the design of an anastigmatic three-mirror telescope using freeform surfaces for the correction of spherical aberration, coma, astigmatism, and field curvature, allowing a wide field of view (FOV) and high resolution. For the structure of this telescope, it is proposed to use only two optical elements where the primary and tertiary mirrors are integrated into an only optical element and the secondary mirror in the other, thus achieving a considerable reduction in the difficulty of alignment and assembly. To achieve a high performance of the telescope, the system was decentered (off-axis design), avoiding the loss of energy due to the obscuration of the M-2 in the on-axis system. In addition, to solve the difficult access to the focus.

关键词： optical design three-mirror system freeform on-axis system off-axis system

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Dispersion sensitivity of large scale axial gradient index glass for spherochromat doublets

Dispersion sensitivity of large scale axial gradient index g...

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

作者： Manhart, PK Hunter, BV Blankenbecler, R Raytheon Missile Syst Co Tucson AZ 85734 USA

ISBN: (纸本)0819432652

Bi-AGRIN cemented doublets, super corrected for zero axial color, spherical aberration and sphero-chromatism (we will call them spherochromats) can show polychromatic performance in the range of 0.004 waves PV or better at the red and blue wavelengths for speeds up to F/2, (0.06 waves PV of F/1.5). These doublets are comprised of two elements of axial gradient index glass. The crown and flint elements are each designed with separate and distinct gradient glass lines, giving each element an axial gradient in refractive index and dispersion(1). This paper examines one design and its performance sensitivity to dispersion modeling via the Buchdahl and Sellmeier dispersion equations.

关键词： optical design gradient index gradient dispersion macro AGRIN large scale AGRIN GRADIUM glass lines spherochromat high performance axial color sphero-chromatism

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Including detector effects in the design of wide-field imaging systems

Including detector effects in the design of wide-field imagi...

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conference on current developments in Lens design and optical engineering V

作者： Harvey, JE Atanassova, M Krywonos, A Univ Cent Florida CREOL Orlando FL 32826 USA

ISBN: (纸本)0819454613

Most imaging systems today include a mosaic detector array in the focal plane. optical designers of astronomical telescopes typically produce a design that yields a superb on-axis aerial image in the focal plane, and detector effects are included only in the analysis of the final system performance. Aplanatic optical designs (corrected for spherical aberration and coma) are widely considered to be superior to non-aplanatic designs. However, there is little merit in an aplanatic design for wide-field applications because one needs to optimize some field-weighted-average measure of resolution over the desired operational field-of-view (OFOV). Furthermore, when used with a mosaic detector array in the focal plane, detector effects eliminate the advantage of the aplanatic design even at small field angles. For wide fields-of-view, the focal plane is frequently despaced to balance field curvature with defocus thus obtaining better overall performance. We will demonstrate that including detector effects in the design process results in a different optimal (non-aplanatic) design for each OFOV that is even superior to an optimally despaced aplanatic design.

关键词： detector effects wide-field imaging systems grazing incidence X-ray telescopes

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A novel laser Doppler linear encoder using multiple-reflection optical design for high-resolution linear actuator

A novel laser Doppler linear encoder using multiple-reflecti...

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conference on current developments in optical design and engineering viI

作者： Shu, DM Alp, EE Barraza, J Kuzay, TM Mooney, TM Argonne Natl Lab Expt Facil Div Adv Photon Source Argonne IL 60439 USA

ISBN: (纸本)0819428841

A novel laser Doppler linear encoder system (LDLE) has been developed at the Advanced Photon Source, Argonne National Laboratory A self-aligning 3-D multiple-reflection optical design was used for the laser Doppler displacement meter (LDDM) to extend the encoder system resolution. The encoder is compact [about 70 mm(H) x 100 mm(W) x 250 mm(L)] and it has sub-Angstrom resolution 100 mm/sec measuring speed, and 300 mm measuring range. Because the new device affords higher resolution, as compared with commercial laser interferometer systems, and yet cost less, it will have good potential for use in scientific and industrial applications.

关键词： linear encoder angular encoder laser encoder high resolution actuator

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Analytic free-form lens design for imaging applications with high aspect ratio

Analytic free-form lens design for imaging applications with...

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conference on current developments in Lens design and optical engineering XIII

作者： Duerr, Fabian Benitez, Pablo Minano, Juan Carlos Meuret, Youri Thienpont, Hugo Vrije Univ Brussel Fac Engn Sci Brussels Photon Team B PHOT TONA FirW B-1050 Brussels Belgium

ISBN: (纸本)9780819492036

A new three-dimensional analytic optics design method is presented that enables the coupling of three ray sets with only two free-form lens surfaces. Closely related to the Simultaneous Multiple Surface method in three dimensions (SMS3D), it is derived directly from Fermat's principle, leading to multiple sets of functional differential equations. The general solution of these equations makes it possible to calculate more than 80 coefficients for each implicit surface function. Ray tracing simulations of these free-form lenses demonstrate superior imaging performance for applications with high aspect ratio, compared to conventional rotational symmetric systems.

关键词： Mathematical methods in physics geometric optical design and lens design free-form optics

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optical design of a single freeform lens for both counter-beam and pro-beam in LED tunnel lighting 25

Optical design of a single freeform lens for both counter-be...

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conference on current developments in Lens design and optical engineering XXV

作者： Syu, Jhih-Ling Lee, Tsung-Xian Tsai, Cheng-Hung Ma, Shih-Hsin Feng Chia Univ Dept Photon Taichung Taiwan Natl Taiwan Univ Sci & Technol Grad Inst Color & Illuminat Technol Daan 106 Taiwan

ISBN: (纸本)9781510679221;9781510679238

A luminaire designed for tunnel lighting is proposed, featuring the ability to adjust the ratio between counter-beam and pro-beam lighting based on different contexts. This allows the luminaire to achieve the optimal lighting mode for the conditions within the tunnel at that time. When both side LEDs are activated, it operates in symmetric lighting mode. When a single-side LED is activated, it switches to either counter-beam or pro-beam lighting mode. The advantage of this luminaire lies in the use of a single freeform secondary lens and LEDs, making installation simpler. It ensures driver safety and is more energy-efficient than traditional tunnel lights.

关键词： optical design Tunnel Lighting Freeform Secondary lens Microstructure

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Progress in the SMS design method for imaging optics

Progress in the SMS design method for imaging optics

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conference on current developments in Lens design and optical engineering XII/Advances in Thin Film Coatings viI

作者： Lin, Wang Benitez, Pablo Minano, J. C. Infante, Jose Biot, Guillermo Univ Politecn Madrid CEDINT E-28040 Madrid Spain

ISBN: (纸本)9780819487384

In this work, two SMS algorithms are presented for an objective design with different selected ray-bundles: three meridian ray-bundles (3M) and one meridian and two skew ray-bundles (1M-2S), the latter from pin hole point of view, provides a better sampling of the phase space. Results obtained with different algorithms will be compared.

关键词： SMS method telephoto lens Meridian ray-bundle Skew ray-bundle imaging system

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