Korean Journal of Optics and Photonics最新文献_第2页

Numerical Modeling of Optical Energy Transfer Based on Coherent Beam Combination under Turbulent Atmospheric Conditions 湍流大气条件下基于相干光束组合的光能传递数值模拟

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.274

Jeongkyun Na, Byunghoon Kim, Hyesun Cha, Y. Jeong

{"title":"Numerical Modeling of Optical Energy Transfer Based on Coherent Beam Combination under Turbulent Atmospheric Conditions","authors":"Jeongkyun Na, Byunghoon Kim, Hyesun Cha, Y. Jeong","doi":"10.3807/KJOP.2020.31.6.274","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.274","url":null,"abstract":"In this paper, the effect of atmospheric turbulence is numerically modeled and analyzed via a phase-screen model, in regard to long-range optical energy transfer using coherent beam combination. The coherent-beam-combination system consists of three channel beams pointing at a target at a distance of 1-2 km. The phase and propagation direction of each channel beam are assumed to be corrected in an appropriate manner, and the atmospheric turbulence that occurs while the beam propagates through free space is quantified with a phase-screen model. The phase screen is statistically generated and constructed within the range of fluctuations of the structure constant   from 10−15 to 10−13 [m  ]. Particularly, in this discussion the shape, distortion, and combining efficiency of the 3-channel combined beam are calculated at the target plane by varying the structure constant used in the phase-screen model, and the effect of atmospheric turbulence on beam-combination efficiency is analyzed. Analysis with this numerical model verifies that when coherent beam combination is used for long-range optical energy transfer, the received power at the target can be at least three times the power obtainable by incoherent beam combination, even for maximal atmospheric fluctuation within the given range. This numerical model is expected to be effective for analyzing the effects of various types of atmospheric-turbulence conditions and beam-combination methods when simulating long-range optical energy transfer.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"274-280"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43175880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of Monitoring Parameters for Coherent Beam Combination through Fourier-domain Analysis of the Speckle Image 基于散斑图像傅里叶域分析的相干光束组合监测参数研究

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.268

Jaedeok Park, Yunjin Choe, D. Yeom

引用次数: 0

Study of the Analysis Method for the Aspherical Tolerance of a Korsch Telescope Using a Q Polynomial 用Q多项式分析柯氏望远镜非球面公差方法的研究

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.328

Won-Kyoun Jun, Han-Yul Lee, Sang Min Lee, Ki-hwan Kim, S. Park, M. Jung

{"title":"Study of the Analysis Method for the Aspherical Tolerance of a Korsch Telescope Using a Q Polynomial","authors":"Won-Kyoun Jun, Han-Yul Lee, Sang Min Lee, Ki-hwan Kim, S. Park, M. Jung","doi":"10.3807/KJOP.2020.31.6.328","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.328","url":null,"abstract":"지상 관측용 인공위성은 감시 ‧ 정찰 임무와 같은 군사 목적 으로 주로 사용되며 미국의 경우에는 0.25 m급 고해상도 인 공위성의 민간 사용을 허가하면서 다양한 민간 기업에서 연 구가 활발히 진행되고 있다. 또한 표 1의 지상 관측용 인공 위성 개발 사례를 보면 같은 해상도에서 높은 성능을 만족하 기 위해 광학계의 주경 크기가 점차 증가하고 있다. 이에 따라 비구면 반사경의 제작 비용이 증가하고 고정밀 제작이 요구되며 반사경의 품질을 평가하기 위한 공차 분석 이 중요하게 되었다. 비구면 형상에 대한 공차 분석은 기존 Zernike fringe sag를 이용한 방법 이외에 비구면 다항식의 계수에 변화를 주어 허용 공차를 분석하는 방법도 있다. 그 러나 기존에 짝수항 비구면 다항식으로 공차 분석을 진행하 면 각 계수항들이 독립적으로 구성되어 있지 않아 정확한 분 석이 어렵다. 따라서 비구면을 짝수항 다항식이 아닌 Study of the Analysis Method for the Aspherical Tolerance of a Korsch Telescope Using a Q Polynomial","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"328-333"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47605606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Autofocusing Mechanism of a Triple-Magnification Infrared System 三倍放大红外系统的自动对焦机理

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.314

Hyojung Jung, Su Seong Jeong, Yun-feng Yang, Y. Lee, Jeongsu Han

引用次数: 0

Impact of Solar Irradiance on the Receiver Sensitivity of Free-Space Optical Communication Systems 太阳辐射对自由空间光通信系统接收灵敏度的影响

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.259

Gihong Park, Hoon Kim

引用次数: 0

Optical Design of a Lister Objective Stable Against Chromatic Variation for 405-nm Wavelength>Optical Design of a Lister Objective Stable Against Chromatic Variation for 405-nm Wavelength 对405nm波长的色度变化稳定的李斯特物镜的光学设计>对405nm波长处的色度变化稳定性的李斯特物镜光学设计

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.295

Jin-Hyung Kim, Jong-Ung Lee

{"title":"Optical Design of a Lister Objective Stable Against Chromatic Variation for 405-nm Wavelength>Optical Design of a Lister Objective Stable Against Chromatic Variation for 405-nm Wavelength","authors":"Jin-Hyung Kim, Jong-Ung Lee","doi":"10.3807/KJOP.2020.31.6.295","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.295","url":null,"abstract":"광학유리의 굴절률은 파장에 따라 변화한다. 이에 따라 광 학계는 사용하는 파장대역에서 파장변화에 따른 특성의 변화 가 최소화되도록 설계될 필요가 있으며, 색수차가 보정된 일 반적인 렌즈계로는 achromat와 apochromat가 있다. Achromat 는 가시광선 대역에서 장파장과 단파장의 굴절능을 일치시 켜 색수차의 발생을 억제하고 있으며, apochromat는 중심파 장과 장파장, 단파장 3파장에서 굴절능을 일치시키고 있다 . 하지만 apochromat는 3종의 유리를 사용하는 3매의 렌 즈가 조합이 되어야 하기 때문에 제작비용이 높다. 이 때문 에 단순한 구조의 대물광학계에서는 2매의 렌즈로 구성되는 achromat가 주로 사용되고 있다. 광학유리는 가시광선 대역 에서 파장이 긴 적색 영역에서는 굴절률의 변화가 적으나 400 nm 부근의 청색 대역에서는 파장이 짧아지면 굴절률이 급격히 증가하는 특성이 있다. 이로 인하여 가시광선 대역의 통상적인 achromat는 이 단파장 대역에서 결상성능의 저하 가 크게 발생하며, 이를 줄이기 위하여 고가의 이상분산 유 Optical Design of a Lister Objective Stable Against Chromatic Variation for 405-nm Wavelength","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"295-303"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42748097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of the Light Reflection from Dielectric Thin Films Coated on Substrates 介质薄膜对光反射特性的研究

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Korean Journal of Optics and Photonics Pub Date : 2020-12-01 DOI: 10.3807/KJOP.2020.31.6.321

Deok Woo Kim, Jiung Kim, B. Kim, M. Cha

{"title":"Investigation of the Light Reflection from Dielectric Thin Films Coated on Substrates","authors":"Deok Woo Kim, Jiung Kim, B. Kim, M. Cha","doi":"10.3807/KJOP.2020.31.6.321","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.6.321","url":null,"abstract":"We investigated the light reflection from thin films coated on substrates. Using a prism with a high refractive index as the incident medium, the phenomena of the total internal reflection (TIR) of the prism/film/substrate system and the light coupling into the optical waveguide formed by the air/film/substrate system were comprehensively studied and compared. If the refractive index of the thin film is greater than that of the substrate, within the TIR region of the substrate, sharp reflection minima occur at specific angles where the waveguide modes are excited, that can be used to accurately measure the refractive index and thickness of a thin film. On the other hand, if the refractive index of the thin film is smaller than that of the substrate, such waveguide modes do not exist. In this case, although not so distinct as a bulk medium, the TIR effect of the thin film is still observable, accompanied by an interference pattern. In this study we analyzed the overall reflection phenomena occurring from prism/film/substrate structures, to investigate the possibility of measuring the refractive index of a thin film in both cases.","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"321-327"},"PeriodicalIF":0.1,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47933452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of a Searchlight Lens to Improve Optical Performance and Fabricability 提高探照灯透镜光学性能和可制造性的研究

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Korean Journal of Optics and Photonics Pub Date : 2020-04-01 DOI: 10.3807/KJOP.2020.31.2.081

Ye-Ji Jo, M. Jung

{"title":"Study of a Searchlight Lens to Improve Optical Performance and Fabricability","authors":"Ye-Ji Jo, M. Jung","doi":"10.3807/KJOP.2020.31.2.081","DOIUrl":"https://doi.org/10.3807/KJOP.2020.31.2.081","url":null,"abstract":"탐조등은 해안, 선박, 항공 등에 설치되어 재난방지 및 인 명 구조 시 탐색용으로 사용되는 대표적인 특수조명이다. 항 상 동작 상태를 유지하는 것이 아니라 긴급 상황 시 불규칙 적으로 사용되므로 높은 내구성을 요구한다. 종래의 탐조등 은 일반적으로 그림 1과 같이 1 kW 이상의 할로겐(halogen) 및 제논(xenon)램프와 같은 단일 광원을 사용한다. 하지만 할로겐램프와 제논램프는 진동과 충격에 취약하며, 기구부가 무거워 운반에 많은 어려움이 있다. 따라서 탐조등의 높은 안정성과 수명을 위해서 고출력 LED를 이용한 탐조등 개발 이 필수적이다. 탐조등은 원거리의 물체를 비추기 위한 조명 장치이기 때 문에 광도가 강하면서 지향각이 최대한 작아야 한다. 종래의 탐조등은 해당 성능을 만족시키기 위해 주로 등기구 후면부 에 포물경을 적용한다. 하지만 포물경은 중심부로 방사되 는 빛의 손실이 발생하여 광 효율이 매우 낮다. 또한 제작 시 광원의 중심점과 포물경의 중심점이 동일한 선상에 위치 Study of a Searchlight Lens to Improve Optical Performance and Fabricability","PeriodicalId":42467,"journal":{"name":"Korean Journal of Optics and Photonics","volume":"31 1","pages":"81-87"},"PeriodicalIF":0.1,"publicationDate":"2020-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43812620","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Acoustic Sensitivity Analysis of a Ring-type Probe Based on a Fiber-optic Sagnac Interferometric Sensor 基于光纤Sagnac干涉传感器的环形探头声灵敏度分析

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Korean Journal of Optics and Photonics Pub Date : 2020-01-01 DOI: 10.3807/KJOP.2020.31.1.013

Yeon-Woo Lee, H. Kwon, I. Kwon

引用次数: 0

Design and Analysis of a Red-Green-Blue Beam Combiner Based on Multimode Waveguides 基于多模波导的红绿蓝光束组合器的设计与分析

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Korean Journal of Optics and Photonics Pub Date : 2020-01-01 DOI: 10.3807/KJOP.2020.31.2.105

Youngchul Chung

引用次数: 0