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Conference on current developments in Lens design and optical engineering XVI

作者： Rezaei, Mohsen Nia, Iman Hasani Bonakdar, Alireza Mohseni, Hooman Northwestern Univ Dept Elect Engn & Comp Sci Bioinspired Sensors & Optoelect Lab BISOL Evanston IL 60208 USA

ISBN: (纸本)9781628417449

An ultra-small telecentric lens with sub-millimeter thickness is proposed. This lens with 0.2 numerical aperture and high field of view is a good candidate to be used in multi-aperture super resolution imagers. Point spread function and the telecentricity of the lens is extracted numerically and measured experimentally. The ray-optics simulation results show nearly diffraction limited performance for the lens.

关键词： Cameras Imaging systems Point spread functions Silicon Image sensors Lens design Infrared cameras Modulation transfer functions Super resolution Sensors

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optical Modeling with Precise Spatial-chromatic Light Distribution in Phosphor-converted White LEDs 16

Optical Modeling with Precise Spatial-chromatic Light Distri...

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Conference on current developments in Lens design and optical engineering XVI

作者： Sun, Ching-Cherng Chang, Yu-Yu Wang, Yu-Huan Chen, Ching-Yi Lo, Yi-Chien Cheng, Han-Hsiang Natl Cent Univ Dept Opt & Photon Chungli 320 Taiwan Natl Cent Univ Inst Lighting & Display Chungli 320 Taiwan

ISBN: (纸本)9781628417449

White light LEDs become more and more important in display and lighting in various structures. Here a new modeling algorithm for phosphor-converted white light-emitting diodes (pcW-LEDs) is proposed, aiming to perform accurate simulation for color appearance, where potentially enabling optical designers to remove yellowish/bluish spots in LED lighting. The proposed modeling method is applied to simulate a pcW-LED with a hemi spherical lens. The simulation accurately predicts the blue and yellow light distribution. The model is further verified by applying a total internal reflector lens to the pcW-LED. In the midfield region, the blue and yellow light distribution exhibit large variations as the observation distance changed;this varying light pattern for both the blue and yellow lights can be accurately predicted by using the proposed model. The well-established optical model should facilitate designing a pcW-LED that features high-quality illumination and enhances color uniformity.

关键词： packaging efficiency luminous efficacy white LED phosphor converted

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Fast robust non-sequential optical ray-tracing with implicit algebraic surfaces 16

Fast robust non-sequential optical ray-tracing with implicit...

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Conference on current developments in Lens design and optical engineering XVI

作者： Greynolds, Alan W. 10741 E Placita Metate Tucson AZ 85749 USA

ISBN: (纸本)9781628417449

The fastest, most robust, general technique for non-sequentially ray-tracing a large class of imaging and non-imaging optical systems is by geometric modeling with algebraic (i.e. polynomial) implicit surfaces. The basic theory of these surfaces with special attention to optimizing their precise intersection with a ray (even at grazing incidence) is outlined for an admittedly limited software implementation. On a couple of "tame" examples, a 64-bit Windows 7 version is significantly faster than the fastest commercial design software (all multi-threaded). Non-sequential ray-surface interactions approaching 30M/sec are achieved on a 12-core 2.67 GHz Mac Pro desktop computer. For a more exotic example of a 6th degree Wood's horn beam dump (light trap), a 32-bit Windows single thread version traces rays nearly 4 times faster than the commercial ASAP software's implicit algebraic surface and over 13 times faster than its equivalent NURBS surface. However, implicit surfaces are foreign to most CAD systems and thus unfortunately, don't easily fit into a modern workflow.

关键词： Ray tracing software surface modeling

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Modeling and design of a multichannel chromatic aberration compensated imaging system 16

Modeling and design of a multichannel chromatic aberration c...

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Conference on current developments in Lens design and optical engineering XVI

作者： Belay, Gebirie Y. Ottevaere, Heidi Vervaeke, Michael Van Erps, Jurgen Thienpont, Hugo Vrije Univ Brussel Fac Engn Dept Appl Phys & Photon TONA Brussels Photon TeamB PHOT B-1050 Brussels Belgium

ISBN: (纸本)9781628417449

Conventional multichannel imaging systems comprise of many optical channels having similar imaging properties, namely field-of-view (FOV) and angular resolution/magnification. We demonstrated that the different optical channels can be designed such that each optical channel captures a different FOV and angular resolution compared to its neighboring channels. We designed and experimentally demonstrated a three-channel multiresolution imaging system where the first optical channel has the narrowest FOV (7 degrees) and highest angular resolution (0.0096 degrees) and the third optical channel has the widest FOV (80 degrees) and lowest angular resolution (0.0780 degrees)(1). The second optical channel has intermediate properties. The performance of the demonstrated three-channel imaging system however was affected by chromatic aberrations as it was designed for a single wavelength of 587.6 nm. The first optical channel was largely influenced by longitudinal chromatic aberration while the third channel by lateral chromatic aberration. Therefore, we have replaced the aspherical refractive lenses by hybrid lenses, which contain diffractive structures on top of their refractive surfaces, in the three-channel multiresolution imaging system to reduce its chromatic aberrations. The performance of the three channels with hybrid lenses is compared with those of the corresponding channels without hybrid lenses. The longitudinal color aberration of the first optical channel has been reduced from 1.7 mm to 0.2 mm;whereas the lateral color aberration of the third optical channel has been reduced from 250 mu m to 14 mu m. In conclusion, the hybrid lenses have reduced the chromatic aberrations of the three channels and extended the operating spectral range of the imaging system in the visible wavelength range.

关键词： Multi-resolution imaging systems angular resolution multi-channel chromatic aberrations

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Development of Indium Phosphide MEMS for Tunable optical Buffering 17

Development of Indium Phosphide MEMS for Tunable Optical Buf...

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17th International Conference on Transparent optical Networks (ICTON 2015)

作者： Podoliak, Nina Ng, Wing H. Stewart, Will Liu, Huiyun Kenyon, Anthony J. Horak, Peter Univ Southampton Optoelect Res Ctr Southampton SO17 1BJ Hants England UCL Dept Elect & Elect Engn London WC1E 7JE England

We are developing a MEMS-based device that can produce continuously tunable delays of optical signals. The design is based on coupled dual suspended waveguides fabricated in Indium Phosphide. We report on simulation-b... 详细信息

ISBN: (纸本)9781467378802

关键词： microelectromechanical systems optical buffering optical waveguides iii-V semiconductor materials indium phosphide

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High power cascade diode lasers emitting near 2 μm

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APPLIED PHYSICS LETTERS 2016年第13期108卷 131109-131109页

作者： Hosoda, Takashi Feng, Tao Shterengas, Leon Kipshidze, Gela Belenky, Gregory SUNY Stony Brook Stony Brook NY 11794 USA

High-power two-stage cascade GaSb-based type-I quantum well diode lasers emitting near 2 mu m were designed and fabricated. Coated devices with cavity length of 3mm generated about 2W of continuous wave power from 100-mu m-wide aperture at the current of 6A. The power conversion efficiency peaked at 20%. Carrier recycling between quantum well gain stages was realized using band-to-band tunneling in GaSb/AlSb/InAs heterostructure complemented with optimized electron and hole injector regions. design optimization eliminated parasitic optical absorption and thermionic emission, and included modification of the InAs quantum wells of electron and composition and doping profile of hole injectors. Utilization of the cascade pumping scheme yielded 2 mu m lasers with improved output power and efficiency compared to existing state-of-the-art diodes. (C) 2016 AIP Publishing LLC.

关键词： Quantum wells iii-V semiconductors Laser diodes Aluminium Heterojunctions

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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Conference on current developments in Lens design and optical engineering XVI

ISBN: (纸本)9781628417449

The proceedings contain 24 papers. The topics discussed include: integration design of endoscope with different viewing angles;ultra-compact hourglass lens for integrated cameras;testing and alignment of freeform based multi-mirror telescopes;tolerancing an optical freeform surface: an optical fabricator's perspective;manufacture and analysis of a refractive surface with variable asphericity to model the human cornea;modeling and design of a multichannel chromatic aberration compensated imaging system;temperature-dependent refractive index measurements of L-BBH2 glass for the Subaru CHARIS integral field spectrograph;cryogenic refractive indices of S-LAH55, S-LAH55V, S-LAH59, S-LAM3, S-NBM51, S-NPH2, S-PHM52, and S-TIH14 glasses;temperature-dependent refractive index measurements of CaF2, Suprasil 3001, and S-FTM16 for the Euclid near-infrared spectrometer and photometer;design considerations for an unconventional infrared prism with a 90 degree ray deviation;and high-performance LED luminaire for sports hall.

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XIX

ISBN: (纸本)9781628417678

The proceedings contain 27 papers. The topics discussed include: first results from the OGRESS sounding rocket payload;technological developments of the OGRE focal plane array;a primer for telemetry interfacing in accordance with NASA standards using low cost FPGAs;modeling contamination migration on the Chandra x-ray observatory: iii;the optical blocking filter for the ATHENA wide field imager: ongoing activities towards the conceptual design;development of the strontium iodide coded aperture (SICA) instrument;recent progress and development of a speedster-EXD: a new event-triggered hybrid CMOS x-ray detector;development of the wide field imager for Athena;LAMP: a micro-satellite based soft x-ray polarimeter for astrophysics;ATHENA: system design and implementation for a next generation x-ray telescope;noise and dark performance for FIREBall-2 EMCCD delta-doped CCD detector;solar glint suppression in compact planetary ultraviolet spectrographs;and characterizing, controlling, and correcting distortions in the COS FUV detector.

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Proceedings of SPIE - The International Society for optical engineering

Proceedings of SPIE - The International Society for Optical ...

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Sensors, Systems, and Next-Generation Satellites XIX

ISBN: (纸本)9781628418491

The proceedings contain 61 papers. The topics discussed include: overview of Japanese earth observation programs;on-orbit performance of the compact infrared camera (CIRC) onboard ALOS-2;current status of the dual-frequency precipitation radar on the global precipitation measurement core spacecraft;EarthCARE/CPR design results and PFM development status;development and pre-launch test status of second generation global imager (SGLI);concept study of a vegetation LIDAR on International Space Station;sensitivity study of SMILES-2 for chemical species;measurement of stratospheric and mesospheric winds with a submillimeter wave limb sounder: results from JEM/SMILES and simulation study for SMILES-2;visible and infrared detector developments supported by the European Space Agency;and low dark current MCT-based focal plane detector arrays for the LWIR and VLWIR developed at AIM.

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InGaP-based quantum well solar cells: Growth, structural design, and photovoltaic properties

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JOURNAL OF APPLIED PHYSICS 2016年第9期119卷 095706-095706页

作者： Hashem, Islam E. Carlin, C. Zachary Hagar, Brandon G. Colter, Peter C. Bedair, S. M. N Carolina State Univ Dept Elect & Comp Engn Raleigh NC 27695 USA

Raising the efficiency ceiling of multi-junction solar cells (MJSCs) through the use of more optimal band gap configurations of next-generation MJSC is crucial for concentrator and space systems. Towards this goal, we propose two strain balanced multiple quantum well (SBMQW) structures to tune the bandgap of InGaP-based solar cells. These structures are based on InxGa1-xAs1-zPz/InyGa1-yP (x>y) and InxGa1-xP/InyGa1-yP (x>y) well/barrier combinations, lattice matched to GaAs in a p-i-n solar cell device. The bandgap of InxGa(1-x)As(1-z)P(z)/InyGa1-yP can be tuned from 1.82 to 1.65 eV by adjusting the well composition and thickness, which promotes its use as an efficient subcell for next generation five and six junction photovoltaic devices. The thicknesses of wells and barriers are adjusted using a zero net stress balance model to prevent the formation of defects. Thin layers of InGaAsP wells have been grown thermodynamically stable with compositions within the miscibility gap for the bulk alloy. The growth conditions of the two SBMQWs and the individual layers are reported. The structures are characterized and analyzed by optical microscopy, X-ray diffraction, photoluminescence, current-voltage characteristics, and spectral response (external quantum efficiency). The effect of the well number on the excitonic absorption of InGaAsP/InGaP SBMQWs is discussed and analyzed. (C) 2016 AIP Publishing LLC.

关键词： iii-V semiconductors Band gap Solar cells Thin film growth Indium

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