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研究生:董畯豪
研究生(外文):Michael Tung
論文名稱:二極體激發式摻釹釩酸釔近紅外光及倍頻綠光雷射之研究
論文名稱(外文):Studies of Diode-Pumped Neodymium Doped Yttrium Orthvanadate (Nd:YVO4 ) Near-Infrared and Green Frequency- Doubling Laser
指導教授:吳坤東姚永德姚永德引用關係
指導教授(外文):Wu Kun-DongYao Yong-De
學位類別:碩士
校院名稱:輔仁大學
系所名稱:物理學系
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2001
畢業學年度:89
語文別:中文
論文頁數:81
中文關鍵詞:二極體激發近紅外光倍頻綠光雷射半球形共振腔倍頻相位匹配居量反置摻釹釩酸釔晶體
外文關鍵詞:Diode-PumpedNear-InfraredGreen Frequency- Doubling LaserHemi-Spherical CavitySecond Harmonic GenerationPhase MatchingPopulation InversionNd:YVO4
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目前所發展出的各種雷射光源,波長涵蓋的範圍仍然有限,雷射經由頻率轉換晶體產生倍頻光的技術,正好提供其他波長的來源。一套體積小、裝置簡單、價格低廉、無須散熱設備的固態雷射系統在商業用途上展現出極大的潛力。隨著各種增益介質的逐漸開發,藉由腔內倍頻技術製造的各式雷射也愈形重要。摻釹釩酸釔/磷酸鈦氧鉀晶體製成的小型倍頻綠光雷射提供了多方面的應用。在低功率應用方面,可以作為光資訊儲存系統的光源、雷射指向器、光相干通訊,亦可用作雷射顯示器所需的三原色之一。
本論文中,主要針對摻釹釩酸釔近紅外光雷射及倍頻綠光雷射做研究。我們以最簡單的半球形共振腔架構,對1 % , 2 % , 3 % Nd 摻雜濃度以長度1 mm , 2 mm, 3 mm的釩酸釔晶體製成小型低功率1.064 紅外光雷射,並找出此二種因素對輸出功率的影響。我們發現長度 1 mm時Nd 摻雜濃度以2 at.%者具有較高的輸出功率;長度2 mm或3 mm下,較高輸出功率者均為1 at.% Nd 摻雜濃度的釩酸釔晶體。
針對綠光雷射部分,我們將KTP晶體置入半球形共振腔內製成倍頻綠光雷射,找出輸入─輸出功率之關係圖。另外,我們比較以摻釹釩酸釔晶體和不同長度的磷酸鈦氧鉀晶體膠合好並在兩端面鍍膜後製成的小型整體倍頻綠光雷射其轉換效率的差異,發現當KTP長度增加時,可以提升倍頻綠光雷射之轉換效率。
At present , sorts of developed laser light sources still have restrictions on the range of the containing wavelength . The technique of lasers producing optical second harmonic generation (SHG) by frequency- transforming crystals just provides the source of other wavelength . A miniature , easily fabricated , and cheap solid state laser system without any cooling equipment presents great potential on commercial purpose . With kinds of active medium gradually developed , it is more important to styles of lasers made by the technique of intercavity optical second harmonic generation . Green frequency-doubling laser manufactured by Nd:YVO4 / KTP crystal supplies manifold applications . In the respect of low power applications , it can be used to be the source of light information storage system , laser pointer , and light coherent communication . It can be one of three primary element colors for the needing of laser display , too .
In this thesis , we are aimed at Nd-doped YVO4 near-infrared laser and green frequency-doubling laser . This design made of hemi-spherical cavity , which is extremely simple , represents a miniature low power 1.064 infrared laser by 1 % , 2 % , 3 % Nd-doping density , and 1 mm , 2 mm , 3 mm YVO4 crystal . The influence of these two factors on the performance of output power was investigated . We find in 1 mm YVO4 crystals , laser used by 2 at.% Nd-doping crystal has higher output power . Crystal length is 2 mm or 3 mm , 1 at.% Nd-doping crystal gets higher output power .
To the part of green laser , we put KTP crystal in the hemi-spherical cavity to produce green frequency-doubling laser , and find the relation between input and output power .
The difference of conversion efficiency measured from a miniature , monolithic green SHG laser are compared with the crystal coating on the two end faces , which is stuck Nd:YVO4 and different length KTP together .
It is found that the longer KTP length increase , the higher conversion efficiency of green frequency-doubling laser improve .

目 錄
誌謝 Ⅰ
中文摘要 Ⅱ
英文摘要 Ⅲ
目錄 Ⅳ
圖目錄 Ⅵ
表目錄 Ⅸ
第一章緒 論 1
第二章理 論 3
2.1雷射基本原理 3
2.1.1 物質與輻射的交互作用 3
2.1.2 愛因斯坦A、B係數 4
2.1.3 組成雷射之要件 8
2.1.4 雷射光的模態 9
2.2倍頻理論 11
2.2.1 晶體的非線性光學現象 11
2.2.2 相位匹配 12
2.2.3 相位匹配的條件 13
2.2.4 雙軸晶的相位匹配 14
2.2.5 倍頻光轉換效率 15
2.3二極體激發式倍頻雷射原理 16
2.3.1 固態雷射能量傳遞機構 17
2.3.2 二極體激發式固態雷射 19
第三章晶 體 22
3.1雷射晶體 (摻釹釩酸釔晶體 Nd:YVO4 ) 22
3.1.1 YVO4晶體的性質與結構 22
3.1.2 Nd:YVO 4晶體的能態 25
3.2頻率轉換晶體 ( KTP ) 27
3.2.1 KTP晶體的生長與結構 31
3.2.2 KTP晶體的主要性質 34
3.2.3 二次諧波的產生 36
第四章實 驗 38
4.1實驗儀器與架構 38
4.1.1 實驗儀器 38
4.1.2 實驗架構 38
4.2對光與優化調整 43
第五章實驗結果與討論 45
5.1紅外光雷射 45
5.1.1 Nd:YVO4晶體的吸收頻譜 45
5.1.2 Nd:YVO4晶體的螢光光譜 51
5.1.3 紅外光雷射輸出功率比較 59
5.2倍頻綠光雷射 67
5.2.1 KTP晶體的穿透光譜 67
5.2.2 半球形架構之倍頻綠光雷射 68
5.2.3 小型整體倍頻綠光雷射 69
5.3能量損耗之來源及未來改進措施 71
第六章結論與展望 75
6.1結論 75
6.2展望 75
參考文獻 78

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