Mr. Cheng-Fang Ho Profile

Cheng-Fang Ho

Associate Researcher at Taiwan Instrument Research Institute

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Author

Publications (26)

Proceedings Article | 2 March 2020 Paper

Modeling the influence function on a fused silica surface for CNC bonnet polishing process

Hao-Lun Chang, Yi-Jyun Lin, Wei-Ren Huang, Hong-Tsu Young, Zong-Ru Yu, Ching-Hsiang Kuo, Cheng-Fang Ho

Proceedings Volume 11287, 112871F (2020) https://doi.org/10.1117/12.2545726

KEYWORDS: Polishing, Silica, Surface finishing, 3D modeling, Process modeling, Superposition, Analytical research, Applied research

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Proceedings Article | 16 October 2017 Paper

Precision lens assembly with alignment turning system

Cheng-Fang Ho, Chien-Yao Huang, Yi-Hao Lin, Hui-Jean Kuo, Ching-Hsiang Kuo, Wei-Yao Hsu, Fong-Zhi Chen

Proceedings Volume 10448, 1044821 (2017) https://doi.org/10.1117/12.2279667

KEYWORDS: Assembly tolerances, Optical fabrication, Optical alignment, Optics manufacturing, Tolerancing, Lens design, Sensors, Interfaces, Precision lens assemblies, Holmium

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Proceedings Article | 23 August 2017 Presentation + Paper

The development of alignment turning system for precision len cells

Chien-Yao Huang, Cheng-Fang Ho, Jung-Hsing Wang, Chien-Kai Chung, Jun-Cheng Chen, Keng-Shou Chang, Ching-Hsiang Kuo, Wei-Yao Hsu, Fong-Zhi Chen

Proceedings Volume 10371, 103710E (2017) https://doi.org/10.1117/12.2273471

KEYWORDS: Lenses, Optical alignment, Autocollimators, Centering equipment, Lens manufacturing, Precision lens assemblies, Lithographic lenses

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Proceedings Article | 23 August 2017 Presentation + Paper

Contact lens design with slope-constrained Q-type aspheres for myopia correction

Wei-Jei Peng, Yuan-Chieh Cheng, Wei-Yao Hsu, Zong-Ru Yu, Cheng-Fang Ho, Khaled Abou-El-Hossein

Proceedings Volume 10375, 103750T (2017) https://doi.org/10.1117/12.2273520

KEYWORDS: Aspheric lenses, Lens design, Visualization, Spherical lenses, Interferometers, Monochromatic aberrations, Eye models, Optical spheres, Contact lenses, Retina

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Proceedings Article | 22 August 2017 Paper

Self-compensation for trefoil aberration of symmetric dioptric microlithographic lens

Wei-Jei Peng, Cheng-Fang Ho, Wei-Yao Hsu

Proceedings Volume 10377, 103770M (2017) https://doi.org/10.1117/12.2273738

KEYWORDS: Wavefronts, Integrated circuits, Image quality, Kinematics, Lithographic lenses, Wavefront compensation

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Proceedings Article | 13 June 2017 Paper

The research on surface characteristics of optical lens by 3D printing technique and precise diamond turning technique

Chien-Yao Huang, Chun-Ming Chang, Cheng-Fong Ho, Tai-Wen Lee, Ping-Hung Lin, Wei-Yao Hsu

Proceedings Volume 10449, 1044910 (2017) https://doi.org/10.1117/12.2270466

KEYWORDS: 3D printing, Optics manufacturing, Diamond turning, Printing, Transmittance, Fabrication, Manufacturing, Telescopes, Optical scanning systems, 3D scanning

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SPIE Journal Paper | 27 May 2017

Absolute measurement method for correction of low-spatial frequency surface figures of aspherics

Wei-Cheng Lin, Shenq-Tsong Chang, Cheng-Fang Ho, Ching-Hsiang Kuo, Chien-Kai Chung, Wei-Yao Hsu, Shih-Feng Tseng, Cheng-Kuo Sung

OE, Vol. 56, Issue 05, 055101, (May 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.5.055101

KEYWORDS: Aspheric lenses, Mirrors, Computer generated holography, Manufacturing, Aspheric optics, Optics manufacturing, Calibration, Monochromatic aberrations

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SPIE Journal Paper | 31 March 2017

Design, tolerance analysis, fabrication, and testing of a 6-in. dual-wavelength transmission sphere for a Fizeau interferometer

Wei-Jei Peng, Cheng-Fang Ho, Wen-Lung Lin, Zong-Ru Yu, Chien-Yao Huang, Ching-Hsiang Kuo, Wei-Yao Hsu

OE, Vol. 56, Issue 03, 035105, (March 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.3.035105

KEYWORDS: Wavefronts, Photovoltaics, Tolerancing, Interferometers, Error analysis, Fizeau interferometers, Zemax, Optical design, Optical spheres, Optical engineering

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Proceedings Article | 31 October 2016 Paper

Design, assembly, and metrology of an oil-immersion microscope objective with long working distance

Wei-Jei Peng, Wen-Lung Lin, Hui-Jean Kuo, Cheng-Fang Ho, Wei-Yao Hsu

Proceedings Volume 10021, 100211N (2016) https://doi.org/10.1117/12.2246254

KEYWORDS: Objectives, Assembly tolerances, Microscopes, Tolerancing, Point spread functions, Modulation transfer functions, Spatial frequencies, Metrology, Optical design, Optical testing

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Proceedings Article | 31 October 2016 Paper

Application of Q-type aspheric surface in the design of Wynne-Dyson projection lens

Cheng-Fang Ho, Wei-Jei Peng, Wei-Yao Hsu

Proceedings Volume 10021, 100210J (2016) https://doi.org/10.1117/12.2245713

KEYWORDS: Aspheric lenses, Lithography, Optics manufacturing, Mirrors, Manufacturing, Tolerancing, Interferometers, Optical spheres, Wavefronts, Inspection

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ITRC dedicates in high precision optics for more than 40 years and focuses in lithography optics for projection system recently. The first project of the lithography optics in ITRC is an i-line Wynne-Dyson projection lens for 3D-ICs applications. The Wynne-Dyson projection lens is a classical design for unity magnification projection system. We take the advantages of the established benefits of Wynne-Dyson lens and modify it. ITRC‘s Wynne-Dyson lens is a 0.16 NA system with unity magnification, which is designed in double telecentricity and long working distance. The projection lens comprises three lenses and one concave mirror. Two aspheric surfaces are deployed in lens 1 and concave mirror. A lens with aspheric surfaces can correct for aberration and deliver a higher performance with fewer lens elements; therefore it has advantages of compact and light. However, aspheres are more difficult to fabricate and higher cost than spherical surface. In order to control the testability and manufacturability of the aspheric surface, the Q-type aspheric surfaces are applied in our design phase and manufacture process. We optimize for both performance and manufacturability by Q-type aspheric surfaces. Not only a testable and manufacturable asphere can be approached but also an additional benefits of less sensitive and cost-effective to manufacture to the required specification. In this paper, the Q-type aspheric surfaces and slope constraint are applied to a Wynne-Dyson projection lens, the testability of Q-type aspheric surfaces by the departure from best-fit-sphere and fringe density of interferometry are estimated. Furthermore, subaperture stitching interferometer system (ASI, from QED technologies) is also applied for testability comparison. The tolerance and sensitivity are also discussed. Finally, the results show a diffraction limit approached lens with testable aspheric surface is designed using Q-type aspheric surface. One of the asphere is 150 m departure from best-fit-sphere in 205 mm clear aperture, that can be tested by subaperture stitching interferometer system (ASI). The alignment tolerance of lens in decenter and tilt can be controlled in the range of ±30 micron and 20 arc-second, respectively.

Proceedings Article | 27 September 2016 Paper

Mounting of reference surface for a transmission sphere

Wei-Jei Peng, Cheng-Fang Ho, Zong-Ru Yu, Chien-Yao Huang, Ching-Hsiang Kuo, Wei-Yao Hsu

Proceedings Volume 9684, 96840G (2016) https://doi.org/10.1117/12.2242360

KEYWORDS: Optical spheres, Wavefronts, Photovoltaics, Optical mounts, Surface finishing, Prototyping, Monochromatic aberrations, Calibration, Polishing, Optical testing

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Proceedings Article | 12 October 2015 Paper

Freeform correction polishing for optics with semi-kinematic mounting

Chien-Yao Huang, Ching-Hsiang Kuo, Wei-Jei Peng, Zong-Ru Yu, Cheng-Fang Ho, Ming-Ying Hsu, Wei-Yao Hsu

Proceedings Volume 9633, 963326 (2015) https://doi.org/10.1117/12.2195464

KEYWORDS: Polishing, Surface finishing, Magnetorheological finishing, Photovoltaics, Optical mounts, Kinematics, Directed self assembly, Glasses, Interferometers, Silica

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Proceedings Article | 11 October 2015 Paper

Optimization of sub-cells orientation for assembly of a high-quality transmission sphere

Wei-Jei Peng, Cheng-Fang Ho, Zong-Ru Yu, Chien-Yao Huang, Ching-Hsiang Kuo, Wei-Yao Hsu

Proceedings Volume 9633, 963315 (2015) https://doi.org/10.1117/12.2195468

KEYWORDS: Wavefronts, Tolerancing, Photovoltaics, Assembly tolerances, Optical spheres, Superposition, Imaging systems, Refractive index, Fizeau interferometers, Interferometers

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Proceedings Article | 3 September 2015 Paper

Design and tolerance analysis of a transmission sphere by interferometer model

Wei-Jei Peng, Cheng-Fong Ho, Wen-Lung Lin, Zong-Ru Yu, Chien-Yao Huang, Wei-Yao Hsu

Proceedings Volume 9582, 958208 (2015) https://doi.org/10.1117/12.2187759

KEYWORDS: Wavefronts, Optical spheres, Photovoltaics, Tolerancing, Interferometers, Zemax, Calibration, Prototyping, Error analysis, Assembly tolerances

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Proceedings Article | 2 September 2015 Paper

Light source heat absorption analysis of a Dyson type lithography lens

Ming-Ying Hsu, Cheng-Fang Ho, Shenq-Tsong Chang, Ting-Ming Huang

Proceedings Volume 9573, 95730L (2015) https://doi.org/10.1117/12.2185669

KEYWORDS: Absorption, Transmittance, Light sources, Geometrical optics, Lithography, Glasses, Ray tracing, Silica, Finite element methods, Reticles

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Proceedings Article | 17 July 2015 Paper

A novel absolute measurement for the low-frequency figure correction of aspheric surfaces

Wei-Cheng Lin, Shenq-Tsong Chang, Cheng-Fang Ho, Ching-Hsiang Kuo, Chien-Kai Chung, Wei-Yao Hsu, Shih-Feng Tseng, Cheng-Kuo Sung

Proceedings Volume 9524, 952417 (2015) https://doi.org/10.1117/12.2189408

KEYWORDS: Mirrors, Computer generated holography, Aspheric lenses, Wavefronts, Optical spheres, Surface finishing, Aspheric optics, Calibration, Monochromatic aberrations, Polishing

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Proceedings Article | 25 September 2013 Paper

Freeform mirror polishing for compensation on non-symmetry system aberrations of remote sensing instrument

Ching-Hsiang Kuo, Zong-Ru Yu, Cheng-Fang Ho, Wei-Yao Hsu, Fong-Zhi Chen

Proceedings Volume 8841, 88410Z (2013) https://doi.org/10.1117/12.2023124

KEYWORDS: Polishing, Surface finishing, Aspheric lenses, Mirrors, Wavefronts, Telescopes, Optical spheres, Interferometers, Diamond turning, Remote sensing

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Proceedings Article | 15 October 2012 Paper

Stray light analysis of the Formosat-5 telescope

Ting-Ming Huang, Cheng-Fang Ho, Po-Han Huang, Yu-Chuan Lin, Shenq-Tsong Chang

Proceedings Volume 8491, 84910A (2012) https://doi.org/10.1117/12.930221

KEYWORDS: Stray light, Telescopes, Light scattering, Tolerancing, Scattering, Sensors, Stray light analysis, Optical alignment, Staring arrays, Ray tracing

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Proceedings Article | 11 October 2012 Paper

Study on measurement of 160 mm convex hyperbolic mirror for Cassegrain reflecting system

Cheng-Fang Ho, Zong-Ru Yu, Ching-Hsiang Kuo, Wei-Yao Hsu

Proceedings Volume 8486, 84860Q (2012) https://doi.org/10.1117/12.928353

KEYWORDS: Computer generated holography, Wavefronts, Polishing, Surface finishing, Mirrors, Aspheric lenses, Interferometers, Photovoltaics, Metrology, Calibration

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Proceedings Article | 11 October 2012 Paper

Fabrication of ф160 mm convex hyperbolic mirror for remote sensing instrument

Ching-Hsiang Kuo, Zong-Ru Yu, Cheng-Fang Ho, Wei-Yao Hsu, Fong-Zhi Chen

Proceedings Volume 8486, 848615 (2012) https://doi.org/10.1117/12.928349

KEYWORDS: Polishing, Surface finishing, Mirrors, Aspheric lenses, Computer generated holography, Photovoltaics, Aspheric optics, Inspection, Spherical lenses, Interferometers

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In this study, efficient polishing processes with inspection procedures for a large convex hyperbolic mirror of Cassegrain optical system are presented. The polishing process combines the techniques of conventional lapping and CNC polishing. We apply the conventional spherical lapping process to quickly remove the sub-surface damage (SSD) layer caused by grinding process and to get the accurate radius of best-fit sphere (BFS) of aspheric surface with fine surface texture simultaneously. Thus the removed material for aspherization process can be minimized and the polishing time for SSD removal can also be reduced substantially. The inspection procedure was carried out by using phase shift interferometer with CGH and stitching technique. To acquire the real surface form error of each sub aperture, the wavefront errors of the reference flat and CGH flat due to gravity effect of the vertical setup are calibrated in advance. Subsequently, we stitch 10 calibrated sub-aperture surface form errors to establish the whole irregularity of the mirror in 160 mm diameter for correction polishing. The final result of the In this study, efficient polishing processes with inspection procedures for a large convex hyperbolic mirror of Cassegrain optical system are presented. The polishing process combines the techniques of conventional lapping and CNC polishing. We apply the conventional spherical lapping process to quickly remove the sub-surface damage (SSD) layer caused by grinding process and to get the accurate radius of best-fit sphere (BFS) of aspheric surface with fine surface texture simultaneously. Thus the removed material for aspherization process can be minimized and the polishing time for SSD removal can also be reduced substantially. The inspection procedure was carried out by using phase shift interferometer with CGH and stitching technique. To acquire the real surface form error of each sub aperture, the wavefront errors of the reference flat and CGH flat due to gravity effect of the vertical setup are calibrated in advance. Subsequently, we stitch 10 calibrated sub-aperture surface form errors to establish the whole irregularity of the mirror in 160 mm diameter for correction polishing. The final result of the Fabrication of ф160 mm Convex Hyperbolic Mirror for Remote Sensing Instrument160 mm convex hyperbolic mirror is 0.15 μm PV and 17.9 nm RMS.160 mm convex hyperbolic mirror is 0.15 μm PV and 17.9 nm RMS.

Proceedings Article | 11 October 2012 Paper

Parameter investigation of air-driving fluid jet polishing

Zong-Ru Yu, Wei-Yao Hsu, Loc Huu Pham, Cheng-Fang Ho, Ching-Hsiang Kuo, Fang-Jung Shiou

Proceedings Volume 8486, 84860L (2012) https://doi.org/10.1117/12.927995

KEYWORDS: Polishing, Silica, Surface roughness, Abrasives, Surface finishing, Fluid dynamics, Glasses, Radium, Applied research, Zerodur

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Proceedings Article | 11 October 2012 Paper

Design and development of bi-directional viewer

Zong-Ru Yu, Cheng-Fang Ho, Annie Liu, Tai-Wen Lee, Wen-Lung Lin, Wei-Yao Hsu

Proceedings Volume 8486, 848613 (2012) https://doi.org/10.1117/12.928062

KEYWORDS: Mirrors, Modulation transfer functions, Video, Optomechanical design, Spatial frequencies, Image quality, Computer aided design, Optical design, Image sensors, Optical fabrication

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Proceedings Article | 26 August 2010 Paper

The Cassegrain Telescope primary mirror isostatic mount design for thermal stress

M. Y. Hsu, W. C. Lin, M. Y. Yang, C. Y. Chan, Y. C. Lin, S. T. Chang, C. F. Ho, T. M. Huang

Proceedings Volume 7813, 78130M (2010) https://doi.org/10.1117/12.860018

KEYWORDS: Modulation transfer functions, Mirrors, Telescopes, Zernike polynomials, Reflection, Space telescopes, Finite element methods, Thermography, Mirror mounts, Optical instrument design

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Proceedings Article | 26 August 2010 Paper

Opto-mechanical design of airborne remote sensing instrument

Wei-Cheng Lin, Cheng-Fang Ho, Ho-Lin Tsay, Ming-Ying Hsu, Po-Hsuan Huang, Chia-Wei Hsu, Ting-Ming Huang

Proceedings Volume 7813, 78130K (2010) https://doi.org/10.1117/12.859796

KEYWORDS: Cameras, Sensors, Imaging systems, Image sensors, CCD image sensors, Image resolution, Modulation transfer functions, Airborne remote sensing, Optical filters, Remote sensing

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Proceedings Article | 1 December 2009 Paper

Baffle design for a Cassegrain telescope

Cheng-Fang Ho, Shenq-Tsong Chang

Proceedings Volume 7506, 75061S (2009) https://doi.org/10.1117/12.838089

KEYWORDS: Modulation transfer functions, Telescopes, Mirrors, Stray light, Optical instrument design, Sensors, Space telescopes, Optics manufacturing, Cameras, Lenses

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Proceedings Article | 23 December 2002 Paper

Porro's achromatic polarization-preserving beam displacer

A-Chuan Hsu, Cheng-Fang Ho, Jyh-Long Chern

Proceedings Volume 4832, (2002) https://doi.org/10.1117/12.486444

KEYWORDS: Polarization, Dielectric polarization, Prisms, Reflection, Tolerancing, Coating, Optical simulations, Optical fibers, Phase shifting, Mirrors

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Showing 5 of 26 publications

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