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Effects and prediction of stray light produced by diffractive lenses

Effects and prediction of stray light produced by diffractiv...

引用

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

作者： Thibault, S Renaud, N Wang, M INO Opt Engn Grp St Foy PQ G1P 4N8 Canada

ISBN: (纸本)0819432652

Correlation between computational models and corresponding experimental data of stray light produced by unwanted diffraction orders of diffractive lenses is described. It is shown that the attractive scaler model under Fresnel approximation does not agree with experimental data. The validity of Fresnel approximation for multi-order focusing optics is derived to explain the limitation of the scaler approach. Geometrical models with both coherent and incoherent summation of each diffractive orders coupled with efficiency estimation is used with success. The model takes into account the local diffraction efficiency and also of the number of diffractive orders supported locally by the structure. This geometrical optics model can be used in standard optical design software. Therefore it may be recommended as an additional tool for stray light analysis at the design stage of hybrid refractive/diffractive optical systems. In a second part, the impact of unwanted diffraction orders when diffractive optics is used in visible imaging systems is discussed. Several experimental observations about the use of plastic refractive/diffractive lens in relation to different fabrication process used to build the lens are also discussed. From those observations, we recommend an approach to reduce the stray light produced by the diffractive lens. In conclusion, a serious stray light analysis is mandatory in the design of visible imaging systems using diffractive lenses.

关键词： stray light diffractive optical element imaging optical design

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design of Large Aperture Four Group Elements Mid-wave Infrared Zoom Lens

Design of Large Aperture Four Group Elements Mid-wave Infrar...

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conference on current developments in Lens design and optical engineering XIII

作者： Ji Yiqun Shi Rongbao He Hucheng Shen Weimin Soochow Univ Inst Modern Opt Technol Key Lab Adv Opt Mfg Technol Jiangsu Prov Suzhou 215006 Jiangsu Peoples R China

ISBN: (纸本)9780819492036

Zoom lens with variable focal length is well fit for researching objectives far and near. design of zoom lens working at mid-wave infrared wavelength (7.7-10.3 m) and its view field 10 degrees is presented. Determination of the initial configuration of the variable and the compensate groups are discussed according to the mechanism compensate curves. The compensate group is determined with positive power. Its focal length changes during a large scope, which is from 300mm to 100mm. And the corresponding F number variables from 3.75 to 1.25. So the residual aberration needs to be carefully corrected. The optimized zoom lens is composed of four group elements, and its performance reaches diffraction limited at each focal position.

关键词： optical design mid-wave infrared zoom lens four group elements mechanical compensate curve large aperture

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optical design method for high zoom ratio lens with liquid lens and digital signal processing

Optical design method for high zoom ratio lens with liquid l...

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conference on current developments in Lens design and optical engineering viII

作者： Hu, Chao-Chang Fang, Yi Chin Tsai, Chen-Mu Lin, Han-Ching Su, Han-Wei Lin, Yu-Cheng Industrial Technology Research Institute-South (Taiwan) National Kaohsiung Univ. of Science and Technology (Taiwan) Kun Shan Univ. (Taiwan)

ISBN: (纸本)9780819468154

This research proposes a newly developed method to high zoom lens for mobile phone use, which the overall length is restricted in mobile phone size acceptable. Generally speaking, the optical design with liquid lens might be more complicated in optimization than traditional optics;not only because aspherical coefficient in liquid lens element is difficult to be defined and measured, but also because efficient optics layout needs more efforts to study in the near future. The paper mainly utilizes liquid lens in order to short total length;two liquid lens elements must be included. Besides consider total length, Lateral aberration also is very important. Lateral aberration will play a significant role in the Modulation Transfer function (MTF), so, the optical design will be able to arise very big, and that the many kinds of chromatics aberration with two groups of liquid lens. Using Digital Signal Processing technology principal factor why this also is.

关键词： optical simulation optical optimization zoom system liquid lens digital signal processing step motor

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The design of a four-mirror anti-astigmatism astronomical telescope 20

The design of a four-mirror anti-astigmatism astronomical te...

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conference on current developments in Lens design and optical engineering XX

作者： Huang, Jiun-Woei Taiwan Instrument Res Inst Natl Appl Labs 20 R&D 6 Rd Hsinchu 30076 Taiwan Natl Taiwan Univ Inst Appl Mech 1 Roosevelt Rd4 Sec Taipei 10617 Taiwan

ISBN: (数字)9781510629028

ISBN: (纸本)9781510629028

The design of four mirrors anti-astigmatism astronomical telescope is carried out for low earth orbit satellite. By integrating with Cassagrain and Schwartzschild configurations, the telescope is design. It contains four mirrors with conic surface, to form an aberration free. The system contains two parts: first part is the Cassagrain type telescope for pick up the ground object to the stop position, and the second part is Schwartzschild configurations as relay optics, which is to relay the image to high resolution CCD sensor to provide 0.5 ground space distance image. The system is symmetric with aberration free within a one cubic size fitted for small satellite. The optic mechanical is simple easy to assemble for optical calibration, while the body is rigid in space.

关键词： four mirrors anti-astigmatism astronomical telescope small satellite

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Structured design method for automotive lamp reflectors

Structured design method for automotive lamp reflectors

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conference on current developments in Lens design and optical engineering IV

作者： Sikkens, M Nuyens, P Philips Ctr Ind Technol Ind Opt Grp NL-5600 MD Eindhoven Netherlands

ISBN: (纸本)0819450464

The design of critical automotive lamp reflectors, e.g. headlamps and fog lamps, is dominated by trial-and-error methods and rules-of-thumb, supported by optical ray-tracing tools like ASAP etc. In many cases these reflectors are designed by aiming small sections to construct the required illumination distribution, which is a time-consuming task and in which case it is very difficult to maintain a continuous reflector surface. The design method presented here is a more structured approach in which the total available front surface is divided in a few relatively large sections, each section designated to produce a certain part of the required light distribution. An optimizing algorithm is used to optimize the separate polynomial reflector sections in combination with a specific burner. In the final step, the separate sections are put together to form a more-or-less continuous reflector surface. Some iteration afterwards is still required because the intersection lines of the polynomial surfaces will generally change the original section boundaries. The design of a front fog reflector lamp is used as a carrier to demonstrate the approach. Three reflector sections are used to design a high-efficiency fog lamp. The light distribution has an excellent horizontal cut-off that basically meets the SAE requirements.

关键词： reflector design lamps automotive head lamp fog lamp optimization

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optical design of a near-infrared birefringent filter system and measurement on birefringence index of calcite

Optical design of a near-infrared birefringent filter system...

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conference on current developments in Lens design and optical Systems engineering

作者： Wang, JS Wang, HM Spirock, TJ Lee, CY Ravindra, NM Ma, J Goode, PR Denker, C New Jersey Inst Technol Dept Appl Phys Newark NJ 07102 USA

ISBN: (纸本)0819437387

In this paper, we present an optical design of a near-infrared (at FeI 15648.5 Angstrom) birefringent filter system which is used to obtain the chromatic images of the sun and measure the solar magnetic field at the Big Bear Solar Observatory (BBSO). This system consists of a prefilter, a liquid crystal analyzer, a wavelength-tunable birefringent filter and a Fabry-Perot Etalon. This system is expected to achieve a clean narrow pass band (1/8 Angstrom). It can also be tuned across the spectral line to obtain line profiles of two-dimensional fields of view. During the design of the tunable near-IR birefringent filter and the test of its components, we found the value of birefringence index mu (n(e) - n(o)) of calcite at spectral range near 15648.5 Angstrom is very different from the value in literature(1). Because the birefringence index is important for the design of birefringent optical components, the birefringence index of calcite and its thermal coefficient are measured. Some test results of the four pairs of calcite prate used in the birefringent filter are presented.

关键词： near-infrared birefringent filter calcite birefringence index Zeeman effect

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A hardware-based simulation platform for optical design and engineering

A hardware-based simulation platform for optical design and ...

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conference on current developments in Lens design and optical engineering viI

作者： Ortiz, Fernando E. Durbano, James P. Sharkawy, Ahmed S. Shi, Shouyuan Curt, Petersen F. EM Photon 51 E Main StSuite 203 Newark DE 19711 USA

ISBN: (纸本)0819463671

optical lenses and systems have historically been of interest to the design and simulation community due to their extensive use in a variety of applications, including telecommunications and imaging. To simulate these systems, it is often possible to take advantage of symmetry or apply physical approximations, such as ray tracing and/or beam propagation, in order to avoid a rigorous solution of Maxwell's equations. However, in cases where these techniques are not applicable, such as when feature sizes become comparable to the wavelength of interest, full-wave electromagnetic simulations are required. Unfortunately, the time constraints and simulation sizes associated with many designs render this analysis infeasible or impractical, a problem that is aggravated by iterative design flows. Hence, a numerical platform capable of handling such computationally intense problems is necessary. In this paper, we present a hardware-based, full-wave simulation platform and demonstrate the advantages of hardware acceleration for the simulation of optical applications. Specifically, we will present a diffractive optical element (DOE) lens simulation, comparing results with previously published analytic and experimental data. We then modify the basic lens arrangement to produce an optical beam splitter. Because such a device cannot be analytically described using symmetry, this example will demonstrate the unique advantages of powerful hardware solvers for the analysis of DOE applications. Finally, we discuss how hardware-based solvers are critical for iterative designs by means of a 1-to-3 beam splitter example. This simulation system represents a new era in optical engineering, enabling the design of next-generation devices today.

关键词： optics lens DOE splitter design hardware simulation FDTD FPGA acceleration

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Linear wavelength spectrometer

Linear wavelength spectrometer

引用

conference on current developments in Lens design and optical engineering II

作者： Thibault, S INO Opt Engn Div St Foy PQ G1P 4S4 Canada

ISBN: (纸本)0819441554

Generally, a spectrometer uses a diffraction grating to spread the spectral components of a light incident on the diffraction grating on a one-dimensional detector. The detector is composed of pixels linearly distributed along a line. However, the diffracted light is not spread linearly on the detector which means that the Wavelength on pixel I is not linearly correlated with the wavelength on pixel 2. The resolution is therefore not constant for all the spectral range of the spectrometer. To know which pixel corresponds to which wavelength, a nonlinear calibration process must be applied to get a linear relation between the diffracted light position and the wavelength of this light. The new spectrometer that we present uses a special lens configuration name F-sin(theta) lens to provide a linear relation in the image plane between the pixel position and the wavelength of the light. The f-sin(theta) characteristic is defined as the difference in percent between the design position of the wavelength in the image plane and its ideal position, if the lens is perfect. The characteristic of the lens used in the spectrometer is better than 0.1%. The concept can also be used for WDM and DWDM applications.

关键词： spectrometer WDM DWDM distortion optical design guided optics

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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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Predictability and unpredictability in optical system optimization

Predictability and unpredictability in optical system optimi...

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conference on current developments in Lens design and optical engineering viII

作者： van Turnhout, Maarten Bociort, Florian Delft Univ Technol Opt Res Grp Lorentzweg 1 NL-2628 CJ Delft Netherlands

ISBN: (纸本)9780819468154

Local optimization algorithms, when they are optimized only for speed, have in certain situations an unpredictable behavior: starting points very close to each other lead after optimization to different minima. In these cases, the sets of points, which, when chosen as starting points for local optimization, lead to the same minimum (the so-called basins of attraction), have a fractal-like shape. Before it finally converges to a local minimum, optimization started in a fractal region first displays chaotic transients. The sensitivity to changes in the initial conditions that leads to fractal basin borders is caused by the discontinuous evolution path (i.e. the jumps) of local optimization algorithms such as the damped-least-squares method with insufficient damping. At the cost of some speed, the fractal character of the regions can be made to vanish, and the downward paths become more predictable. The borders of the basins depend on the implementation details of the local optimization algorithm, but the saddle points in the merit function landscape always remain on these borders.

关键词： optimization optical system design saddle points fractals basins of attraction

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