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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 黃升龍(Sheng-Lung Huang) | |
dc.contributor.author | Yen-Sheng Lin | en |
dc.contributor.author | 林晏聖 | zh_TW |
dc.date.accessioned | 2021-06-08T05:39:07Z | - |
dc.date.copyright | 2011-07-27 | |
dc.date.issued | 2011 | |
dc.date.submitted | 2011-07-25 | |
dc.identifier.citation | [1.1] D. Huang, E. A. Swanson, C. P. Lin, J. S. Schuman, W. G. Stinson, W. Chang, M. R. Hee, T. Flotte, K. Gregory, C. A. Puliafito, and J. G. Fujimoto, “Optical coherence tomography,” Science, vol. 254, pp. 1178–1181, 1991.
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/24736 | - |
dc.description.abstract | 光學同調斷層掃描術已經成為一個活躍的領域,具有取得活體生物組織及工業上微觀結構之三維斷層影像的功能。因此,本論文開發出具有寬頻及高亮度特性的光學同調斷層掃描術光源,經由提高掃描光源的頻寬及輸出功率以改善光學同調斷層掃描術的縱向解析度及信雜比,而且近似高斯波型的光譜形狀更可達成縱向影像畫素間之低串音。對於高亮度光源的發展也可應用於固態照明產業,以滿足日益增長的能源節約技術的需求。
在白光光源的研發上,我們成功地以共抽絲雷射加熱基座生長法開發出纖心直徑10微米的摻鈰釤釔鋁石榴石雙層纖衣晶體光纖。採用中心波長446奈米的藍光雷射二極體做為激發光源,而鈰及釤離子經吸收藍光後,分別放出中心波長560奈米的黃光及618奈米的紅光,經調整三顏色的比例,可獲得亮度高達4.5x109 cd/m2 且光通量為6.2流明的白光點光源。依據白光頻譜經模擬調整光纖長度及離子濃度最佳化後,演色性係數及相對色溫可達83及5427 K。將此光源耦入直徑200奈米的多模光纖,輸出功率及耦光效率可達4.8毫瓦及36.8%,此白光點光源適用於生醫內視鏡的應用及長距離具方向性的固態照明。 在光學同調斷層掃描術的研發上,我們成功產生中心波長及半高寬分別為560微米及90奈米之寬頻光源。為有效擴展光源頻寬,以電子槍側鍍的方式摻入釤離子,經生長後可將寬頻擴寬超過100奈米,其空間中的縱向解析度可達1.38微米,縱向影像畫素間之串音,對相鄰畫素為-22.5 dB,對第二與第三非相鄰畫素各為-32.6 dB及-41.3 dB,可應用於細胞生物組織結構或工業製造的微觀結構的量測。在增加輸出功率方面,以高反射端面鍍膜及熱退火處理方式,有效地將輸出功率提升76%。採用中心波長446奈米的藍光雷射二極體做為激發光源,可產生高達13.3毫瓦之寬頻輸出光,有效地提升光學同調斷層掃描系統的信雜比。而且以直接耦光的方式,在SMF-28輸出端可得到46.6微瓦,可進一步提升光學同調斷層掃描系統的橫向解析度至2.8微米。由小信號增益實驗量測結果可知,在86毫瓦功率激發下,可使波長532奈米的信號光強度-22.2 dBm,產生4.2 dB的小訊號增益。未來可在晶體光纖兩側端面鍍上高反射光學膜,達成Ce3+:YAG晶體光纖雷射的開發或開發綠光波段的光放大器。 | zh_TW |
dc.description.abstract | The technology of optical coherence tomography (OCT) has become an active research field for its capability of in vivo and three-dimensional tomographic imaging of biological tissues and microstructure morphology in industrial application. Thus, this thesis is dedicated to prepare a broadband and high brightness light source for an OCT system to improve its performance of bandwidth and output power. The broad bandwidth enhances the OCT axial resolution and its high power boosts the signal-to-noise ratio (SNR). Its nearly Gaussian spectrum enables crosstalk of the axial image, The current light source development can also be applied in the solid-state lighting industry to meet the growing demands of energy-saving and sustainable technology.
For research and development in the white light source, a 10- | en |
dc.description.provenance | Made available in DSpace on 2021-06-08T05:39:07Z (GMT). No. of bitstreams: 1 ntu-100-D95941001-1.pdf: 6775717 bytes, checksum: 18b36a442ae9d3de3b882e01cc12d4b2 (MD5) Previous issue date: 2011 | en |
dc.description.tableofcontents | Abstract i
中文摘要 iii Table of Contents iv List of Figures vi List of Tables x Chapter 1 Introduction 1 1.1 Introduction of broadband Light Sources 1 1.2 Motivation of Ce3+:YAG Crystal Fiber Development 3 References 6 Chapter 2 Properties of Ce3+:YAG Crystal Fiber 8 2.1 History of Ce3+:YAG 8 2.2 Structure of YAG 9 2.3 Energy Level, Rate Equation, and Absorption/Emission Spectra 12 2.3.1 Ce3+:YAG Crystal Fiber 14 2.3.2 Ce3+,Sm3+:YAG Crystal Fiber 15 References 18 Chapter 3 Fabrication and Measurement of Ce3+:YAG Crystal Fiber 20 3.1 E-gun System and Optical Monitor System 20 3.1.1 En-face Optical Coating 24 3.1.2 Perimeter Deposition for Concentration Enhancement 26 3.2 LHPG System 28 3.2.1 Single Crystal Fiber Growth 29 3.2.2 Single-Clad Crystal Fiber Growth 31 3.2.3 Double-Clad Crystal Fiber Growth 31 3.3 Package Method and Grind/Polish Treatment 33 3.4 Concentration Profile Measurement of Double-Clad Crystal Fiber 35 3.5 Refractive Index Profile Measurement 36 3.5.1 Laser Scanning Confocal Microscopy System 36 3.5.2 Index Profile of Double-Clad Crystal Fiber 37 3.6 Fluorescence Emission Spectra Measurement 38 3.6.1 Single Crystal Fiber 38 3.6.2 Double-Clad Crystal Fiber 39 References 40 Chapter 4 High-Luminance White-Light Point Source Using Ce3+,Sm3+:YAG Double-Clad Crystal Fiber 42 4.1 Introduction 42 4.1.1 Color Science 44 4.1.2 Radiometry and Photometry 46 4.1.3 Experimental Set-Up 55 4.2 Measurement Result and Discussion 58 4.2.1 Point Source Output Spectrum 58 4.2.2 Far-Field Pattern 60 4.2.3 CRI and Chromaticity 61 4.3 CRI and Output Spectra Simulation 64 4.3.1 CRI Simulation using LED and LD as Pumping Source 64 4.3.2 Output Spectra using LED and LD as Pumping Source 64 References 66 Chapter 5 Ce3+:YAG Double-Clad Crystal Fiber Based Broadband Light Source 68 5.1 Motivation and Experimental Set-Up 68 5.2 Fluorescence Bandwidth Enhancement by Sm ions Perimeter Deposition 72 5.3 Output Power Enhancement 74 5.3.1 HR Optical Coating 74 5.3.2 Annealing Treatment 76 5.3.3 Output Power Simulation 78 5.4 Optical Gain Measurement 83 5.4.1 Experimental Set-Up 83 5.4.2 Measurement Results and Discussion 84 5.5 Calculated Interference Signal 88 5.6 SMF-28 Pigtailed Output 90 References 93 Chapter 6 Conclusions and Future Work 95 | |
dc.language.iso | en | |
dc.title | 摻鈰釔鋁石榴石功能性晶體光纖 | zh_TW |
dc.title | Ce3+-Doped YAG Functional Crystal Fibers | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 林晃巖(Hoang-Yan Lin),黃鼎偉(Ding-wei Huang),徐世祥(Shih-Hsiang. Hsu),葉秉慧(Ping-Hui Yeh),羅家堯(Chia-Yao Lo) | |
dc.subject.keyword | 稀士元素,晶體光纖,寬頻光源,亮度, | zh_TW |
dc.subject.keyword | rare-earth elements,crystal fibe,broadband light source,luminance, | en |
dc.relation.page | 96 | |
dc.rights.note | 未授權 | |
dc.date.accepted | 2011-07-26 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
顯示於系所單位: | 光電工程學研究所 |
文件中的檔案:
檔案 | 大小 | 格式 | |
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ntu-100-1.pdf 目前未授權公開取用 | 6.62 MB | Adobe PDF |
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