臺灣博碩士論文加值系統

2009年，剛上任的美國總統歐巴馬提出能源和環境發展規劃號召全美國發展「廉價、清潔、高效的能源」；世界各國亦逐漸已經將發展固態照明技術提升到國家戰略的層次，目的是創造一個環保高效能的照明產業。估計到西元2020年，固態照明每年將為全球節省11%的耗電量，及兩億五千九百萬噸的碳排放量，相當於省下一千一百二十億美金的支出，因此高亮度固態白光光源的研究已經逐漸成為綠能產業的顯學。
本論文研究在YAG晶體光纖側鍍上CeO2與Sm2O3薄膜，再經由LHPG方法重新生長成纖心直徑為10 μm 的Ce3+,Sm3+:YAG晶體光纖。參考現今高亮度白光LED使用藍光加黃色螢光粉的混光機制，本論文以中心波長446 nm的藍光LD做為激發光源，利用物鏡聚焦，以纖心激發的方式使Ce3+,Sm3+離子產生3dB頻寬為98 nm的寬頻黃光ASE光源，其一方面適合作為超高解析度低同調斷層掃瞄術之光源（OCT），縱向解析度可達1.5 μ ，應用於細胞病變檢測或液晶顯示面板的pretilt角度的量測將有重大貢獻；另一方面，在僅300 mW藍光激發下，殘餘的藍光和黃光混合輸出將得到亮度高達2.2x108 cd/m2之高亮度白光光源，其亮度幾近於目前亮度最高的超高壓汞燈Ultra-high-Pressure (UHP) Mercury Lamp 100M~1G cd/m2的水準，其色度座標為 (0.3022,0.3335) ，接近於色度座標正中心位置。除此之外，小信號增益實驗量測結果顯示，Ce3+,Sm3+:YAG晶體光纖在100 mW功率激發下，可使信號強度-29.33 dBm的信號，有5.47 dB的增益。未來將可藉由兩端面膜層形成對激發光源高穿率與532 nm波長附近輻射光子高反射之雷射共振腔，達成Ce:YAG晶體光纖雷射開發；亦或是開發綠光波段的光放大器。 I

In 2009, the newly inaugurated U.S president Barack Obama has proposed an energy-environment strategic plan focusing on the development of “inexpensive, clean, and highly-efficient energy.” At the same time, the leading countries worldwide are also rising the importance of solid-state lighting research to a national military strategic level, which is aimed at creating an eco-friendly and highly-efficient lighting business. It is estimated that by the 2020, solid-state lighting will be able to save 11% of global energy plus 259 million tons of carbon dioxide emission each year, which is equivalent to saving an expenditure of US$112 billion yearly. Therefore, the field of high-brightness solid-state lighting research has gradually evolved as a mainstream subject of the green-energy industry.
This thesis studies the thin-layers-coating of CeO2 and Sm2O3 on the circumference of pure YAG crystal fiber, and the regrow of coated samples into Ce3+,Sm3+:YAG crystal fibers with 10 μm-diameter core by LHPG method. Referring to present mechanism regarding the color blending of high-brightness white LED, which is formed by combining blue LED with yellow phosphors, this study uses blue laser diode of 446 nm center wavelength as exciting light source, and uses objective lens to focus the laser on crystal-fiber. By the core-excited method, the mechanism can excite Ce3+ and Sm3+ ions and generate yellow broad-band ASE light of 98 nm 3dB bandwidth, which on the one side serve as the light source for high-resolution low Optical Coherence Tomography (OCT) with its axial resolution up to 1.5 μm, and is expected to have great contribution on cell-pathological-changes detection as well as LCD’s pretilt angle measurement; and on the other side will blend with residuary blue light and turn into white light with its brightness close to Ultra-high-Pressure (UHP) mercury lamp at highest brightness level of 100M~1G cd/m2 and chromaticity coordinates of (0.3022,0.3335) nearly at the center of the chromaticity diagram. In addition, according to the measurement results of small-signal gain experiment, Ce3+,Sm3+:YAG crystal fiber can create 5.47 dB gain of -29.33 dBm signal at 100 mW exciting power. For future research perspective, by using AR coating for exciting light source and HR coating at wavelength near 532 nm, it is possible to form laser resonator, which can achieve the development of Ce:YAG crystal fiber laser, or the development of green-band optical amplifier.

中文摘要.............................................I
Abstract.............................................II
目錄.................................................IV
圖目錄...............................................V
表目錄...............................................VIII
第一章 緒論..........................................1
1.1 簡介.............................................1
1.2 研究動機.........................................3
第二章 Ce3+:YAG晶體特性與增紅(Red enhancement).......5
2.1 歷史沿革.........................................5
2.2 Host選擇與YAG晶體結構特性........................6
2.3 增紅離子特性分析.................................9
2.4 Ce3+,Sm3+:YAG能階模型與吸收/輻射頻譜.............14
第三章 Ce3+,Sm3+:YAG晶纖之製備與光學檢測.............17
3.1 CeO2與Sm2O3的側鍍................................17
3.2 LHPG生長.........................................19
3.3 晶體光纖的包覆與研磨拋光.........................23
3.4 Ce,Sm離子濃度與螢光量測..........................27
3.5 吸收頻譜量測.....................................30
3.6 Ce3+,Sm3+:YAG雙纖層衣晶體光纖折射率量測..........32
第四章 Ce3+,Sm3+:YAG白光光源之特性　.................34
4.1 色彩學與白光光源重要參數.........................34
4.1.1 背景介紹.......................................34
4.1.2 輻射量度學(Radiometry)與光度學(Photometry).....36
4.1.3 色度座標圖 (Chromaticity diagram)..............39
4.1.4 相關色溫(Correlated color temperature )........43
4.1.5 演色性係數 (Color rendering index).............46
4.2 CRI計算與模擬分析................................50
4.3 纖心激發之高亮度白光光源.........................52
4.4 自聚焦透鏡聚焦纖衣激發之高亮度白光光源...........64
第五章 Ce3+,Sm3+:YAG自發性輻射放大光源量測...........70
5.1 端面激發Ce3+,Sm3+:YAG自發性輻射放大光源..........70
5.2 端面高反射膜鍍膜效果分析.........................73
5.3 小信號增益量測...................................75
第六章 結論..........................................80
參考文獻.............................................82

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