• Title/Summary/Keyword: Optical Element

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A Study on the Optical Element Alignment Automation using Multi-Axis Ultra Precision Stage (극초정밀 다축 스테이지를 이용한 광소자 정렬 자동화에 관한 연구)

  • Jeong, Sang-Hwa;Kim, Gwang-Ho
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.15 no.6
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    • pp.64-70
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    • 2006
  • The optical element was usually used in optical devices and optical transfer devices, but it has been recently used in communication, computer and medical equipment. With the development of very high speed optical-communication, the development of the kernel parts of optical communication has also increased. Presently, the alignment of the optical element is time consuming, and an effective alignment algorithm has not yet to be developed. In this paper, the alignment automation of the optical element is studied. The ultra precision stage is applied to an optical element alignment to improve the accuracy of the alignment. The automation program of the optical element alignment is developed by LabVIEW programming to save the alignment time. The alignment algorithms of the optical element consist of field search and peak search algorithms.

Full Color Holographic Optical Element Fabrication for Waveguide-type Head Mounted Display Using Photopolymer

  • Piao, Jing-Ai;Li, Gang;Piao, Mei-Lan;Kim, Nam
    • Journal of the Optical Society of Korea
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    • v.17 no.3
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    • pp.242-248
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    • 2013
  • Full color holographic optical element fabrication using a photopolymer is proposed for a waveguide-type head mounted display. The fabricated full color holographic optical elements can be attached to the waveguide to replace the conventional couple-in and couple-out optics in the head mounted display. To implement the system, this study analyzed the optical characteristics of the photopolymer using three lasers (red, green and blue). Considering the color uniformity, a new laminated structure for a full color holographic optical element was also designed. The proposed system was confirmed experimentally.

A Study on Optical Element Alignment Automation using Ultra Precision Positioning Stage (극초정밀 위치제어장치를 이용한 광소자 정렬 자동화에 관한 연구)

  • Jeong S.H.;Kim H.U.;Choi S.B.;Kim G.H.;Park J.H.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.10a
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    • pp.314-317
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    • 2005
  • As demands of VBNS and VDSL increase, the development of kernel parts of optical communication such as PLC(Planar Light Circuit), Coupler, and WDM elements increases. The alignment and the attachment technology are very important in the fabrication of optical elements. The ultra precision stage wasn't yet applied in the optical alignment and the optical element alignment was taken too many times. In this paper, the optical element alignment of ultra precision positioning stage was studied. The alignment algorithm is comprised of field search and peak search algorithms. The procedure of the alignment algorithms applied to the ultra precision positioning stage are developed by LabView programming.

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The Development of Ultra-precision Aspheric Program for Optical (광학소자용 초정밀 비구면 가공프로그램 개발)

  • 김우순;김동현;난바의치
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 2004.04a
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    • pp.53-57
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    • 2004
  • In this paper, we will present the Aspheric Surface Program for optical element. X-ray optical element designed to give a high resolution and reflectively in order to observe the living cell in the range of the water window. According to optical design, we developed the Aspheric Surface Program using the visual basic. Using the Aspheric Surface Program, we directly machined the electroless nickel bulk.

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Design and Fabrication of Optical Element for Speckle Reduction in Laser Projector (레이저 프로젝터의 스페클 저감을 위한 광학 소자 설계 및 제작)

  • Lee, Jae-Yong;Kim, Young-Joo
    • Transactions of the Society of Information Storage Systems
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    • v.10 no.2
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    • pp.55-60
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    • 2014
  • Laser projector has many advantages of high brightness, high resolution and small size, but the huge drawback of image degradation called speckle which generated by coherence of laser and roughness of surface interrupts their general use. There are many methods to reduce speckle pattern, but they need effective optical systems to realize display to the far field with huge volume. We designed speckle reduction element by using microlens with controlled curvature to reduce spatial coherence. Vibration element was also applied to reduce temporal coherence which considered response time of eye. Designed element was fabricated by simple reflow method and imprinting method. From the results, the fabricated element performed 48.33% of speckle reduction efficiency and 41.29% of optical efficiency with a single doublet lens.

Diffractive Optical Element for Noise-reduced Beam Shaping of Multi-array Point Light Source

  • Lee, Jonghyun;Hahn, Joonku;Kim, Hwi
    • Current Optics and Photonics
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    • v.5 no.5
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    • pp.506-513
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    • 2021
  • An arrayed diffractive optical element design for the beam-shaping of a multi-array light source is proposed. This is an essential device for recent optical security and face recognition applications. In practice, we devise a DC noise reduction technique featuring high fabrication error tolerance regarding the multi-array light source diffractive optical elements, as a necessary part of the proposed design method. The spherical diverging illumination leads to DC-conjugate noise spreading. The main idea is tested experimentally, and the multi-array light source diffraction pattern is investigated numerically.

Diffractive Optic Elements (회절광학 소자 렌즈)

  • 최종곤
    • Optical Science and Technology
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    • v.8 no.2
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    • pp.22-26
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    • 2004
  • 회절 광학 소자(Diffractive optical element)는 광학 시스템에 있어서 광을 조절하기 위하여 굴절(refraction) 또는 반사(reflection)보다는 주기 구조(periodic structures)에 의한 회절(diffraction)을 이용한 소자라 할 수 있다. DOE의 장점으로는 수차(aberration)가 없는 point-to-point 이미지가 가능하며 광 power를 사용한 평판(flat subface)이 가능하고 비구면과 같은 수차 조절이 가능하다. 단점으로는 HOE(Hologram Optical Element: DOE의 일종)의 수차가 이 구조의 특정 파장에서 나타나고 가시영역의 일정 영역에서 매우 분산적 (dispersive)이다. 또한 상대적으로 시장의 성장에 비하여 찾는 고객의 수가 적다는 점이다.(중략)

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Propagation Characteristics Analysis of Dielectric Waveguide Using a Finite-Element Method (유한요소법에 의한 유전체 광도파관의 전파특성 해석)

  • 강길범
    • Proceedings of the Optical Society of Korea Conference
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    • 1989.02a
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    • pp.157-160
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    • 1989
  • The most serious difficulty in using the finite element method is the appearance of the so-called spurious, nonphysical modes. We have proposed the finite element formulation of the variational expression in the three-component magnetic field based on Galerkin's method. In this approach, the divergence relation H is satisfied and spurious modes does not appear and finite-element solutions agree with the exact solutions.

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