• 한국광학회지
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• 제31권5호
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• pp.231-231
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• 2020

• 한국정밀공학회지
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• 제25권8호
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• pp.21-28
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• 2008

Fizeau interferometer is used for inspecting the lens surface profile accurately. This study is focused on the design and optical measuring techniques for large optical components, such as a reflection mirror for large area lithography or astronomical purpose. A tower type Fizeau interferometer is designed and set up in horizontally with a 45$^{\circ}$ fold mirror which makes easy to align the optical path of heavy interferometer system. To align the optical path, a five-axes stage for the interferometer is required. This study shows a method of the 45$^{\circ}$ fold mirror alignment by using a three-axis stage instead of adjusting the interferometer itself or measuring object. This system will be installed on the large optics polishing machine during the manufacturing process as an on-machine inspection system.

• 천문학회보
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• 제28권2호
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• pp.51-51
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• 2003

• 한국안광학회지
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• 제7권2호
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• pp.135-141
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• 2002

눈의 보색조건에서 색상환에 대한 의존성을 이용하여 피검사자의 굴절력을 측정할 수 있도록 연구하였다. 그 결과 원시가 보다 넓은 범위의 명도 단계를 보는 것으로 나타났다. 그러나 채도와의 관계에서는 근시나 원시의 구별이 뚜렷하게 나타나지 않아 눈의 종류와 채도와의 상관관계는 미약한 것으로 나타났다. 굴절력과 보색잔상의 색을 명도와 채도로 나누어 살펴보면 굴절력의 절대값이 클수록 넓은 범위의 색을 보는 것으로 나타났고, 작을수록 좁은 범위의 색을 보는 것으로 나타났다. 즉 명도는 눈이 좋은 사람일수록 적은 범위의 잔상효과가 있는 것으로 나타났다. 이러한 보색연구는 안경사가 실시하고 있는 적 녹 2색 검사(red-green test)를 한 단계 높이는 검사법으로 활용할 수 있다고 생각된다.

• 한국광학회:학술대회논문집
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• 한국광학회 2002년도 하계학술발표회
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• pp.34-35
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• 2002

Large-screen projectors for video applications and computer monitors are convenient instruments for conference presentations as well as for TV use at home. Recently, CRT and LCD projectors have achieved higher resolutions and luminance in the projection TV The large surface of the CRT compared to the LCD allows a great number of pixels to be displayed, while simultaneously providing maximum brightness of the final picture. (omitted)

• Current Optics and Photonics
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• 제5권6호
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• pp.627-640
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• 2021

In a free-space coherent optical communication system, wavefront distortion is frequently beyond the correction range of the adaptive-optics system after the laser has propagated through the atmospheric turbulence. A method of residual wavefront correction is proposed, to improve the quality of coherent optical communication in free space. The relationship between the wavefront phase expanded by Zernike polynomials and the mixing efficiency is derived analytically. The influence of Zernike-polynomial distortion on the bit-error rate (BER) of a phase-modulation system is analyzed. From the theoretical analysis, the BER of the system changes periodically, due to the periodic extension of wavefront distortion. Experimental results show that the BER after correction is reduced from 10^-1 to 10^-4; however, when the closed-loop control algorithm with residual correction is used, the experimental results show that the BER is reduced from 10^-1 to 10^-7.

• Journal of the Optical Society of Korea
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• 제15권4호
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• pp.394-397
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• 2011

For the purpose of fabricating off-axis aspheric optics, we propose an 8-axis-polishing machine combined with a testing tower whose height is up to 9 m. The proposed polishing machine was designed and analyzed by using a well-known finite element method. The eight axes of the machine have a synchronized motion generated by a computer, and each axis was calibrated by a heterodyne laser interferometer or an optical encoder. After calibration, the maximum positioning error of the machine was less than 2 ${\mu}m$ within a whole 2 m ${\times}$ 2 m area. A typical fabrication result of a ${\phi}1.5$ m concave mirror was also described in this manuscript.

• 한국결정성장학회지
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• 제4권3호
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• pp.230-237
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• 1994

본 논문은LBO 결정성장 및 응용과 높은 점성을 갖는 용액에서 결정성장의 열역학과 동역학의 모델에 관하여 연구하였다. 결정공명과 press-controlled oscillator의 특성에 대한 측정은 이러한 종류의 결정이 많은 응용 가능서을 갖는 압전 결정재료의 한 종류임을 나타내 준다.

• Journal of the Optical Society of Korea
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• 제19권5호
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• pp.521-530
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• 2015

Active optics is a key technology for future large-aperture space telescopes. In the design of deformable mirrors for space applications, the design parameter trade-off between the number of regularly configured actuators and the correction capability is essential but rarely analyzed, due to the lack of design legacy. This paper presents a parametric module method for integrated modeling of deformable mirrors with regularly configured actuators. A full design parameter space is explored to evaluate the correction capability and the mass of deformable mirrors, using an autoconstructed finite-element parametric modeling method that utilizes manual finite-element meshing for complex structures. These results are used to provide design guidelines for deformable mirrors. The integrated modeling method presented here can be used for future applied optics projects.

• Journal of the Optical Society of Korea
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• 제20권1호
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• pp.64-69
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• 2016

A new compact conformal dome optical system was established, and the aberration characteristics of the dome were investigated using Zernike aberration theory. The aberrations induced by the dome at different fields of regard (FORs) from 30° to 100° were effectively balanced by a rotating cylindrical lens. This kind of optical system can be widely used in top-view optical searching devices. A design method was introduced and the optimization results analyzed in detail. The results showed that the Zernike aberrations produced by the conformal dome were decreased dramatically. Also, a complete conformal optical system was designed, to further illustrate the aberration correction effect of the rotating cylindrical lens. Using a cylindrical lens not only provided a large FOR, but also simplified enormously the structure of the conformal optical system.