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研究生:李俊誼
論文名稱:Z-掃瞄量測硒化鎵晶體之非線性效應
論文名稱(外文):Z-Scan Measurement of the nonlinear optical
指導教授:謝文峰謝文峰引用關係
指導教授(外文):Wen-Feng Hsieh
學位類別:碩士
校院名稱:國立交通大學
系所名稱:光電工程所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:65
中文關鍵詞:硒化鎵非線性效應Z掃瞄
外文關鍵詞:GaSenonlinear optical propertiesZ-Scan
相關次數:
  • 被引用被引用:2
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  • 下載下載:26
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利用飛秒超短脈衝鈦藍寶石雷射(波長820nm,脈衝寬度70飛秒)從事變化強度Z-掃瞄量測技術研究利用垂直布式長晶法所長的ε相硒化鎵半導體晶體,我們發現此樣品除了量測出非線性雙光子吸收係數β=13.28±0.2cm/GW,並且測出非線性折射率之變化現象現象,所得出的三階非線性折射係數γ=-3.779x10-13cm2/W,以及五階非線性折射係數σr=1.25x10-18cm3。並且改變雷射入射光與晶體的光軸之相對角度θ,我們可以證實在θ>5°(θ≒5°為相位匹配角)負的非線性折射率是因為串連的二階效應所造成的。此外等效的三階非線性係數在θ< 5°是可以確定的也是因為串連的二階效應所引起的引起的。

By using a femtosecond Ti:sapphire laser (wavelength = 820nm) as z-scan light source, we have studied intensity dependent nonlinear refractive index of the ε-GaSe single crystal grown by Vertical Bridgman growth method . We not only measure the two photon absorption coefficient to be 13.28±0.2 cm/GW, but also the third order nonlinear refraction index coefficient γ= ﹣3.779x10-13cm2/W and the fifth order nonlinear refraction indexσ=1.25x10-18cm3. By rotating the incident angle of the crystal axis with respect to the optical axis of the laser beam, we verify the negative refraction index atθ﹥5° by cascadeχ(2):χ(2) process .Furthermore the effective χ(3) becomes positive for θ< 5°

目錄
頁次
中文摘要…………………………………………………Ⅰ英文摘要…………………………………………………Ⅱ
誌謝………………………………………………………Ⅲ
目錄………………………………………………………Ⅳ
表目錄…………………………………………………….Ⅴ
圖目錄…………………………………………………….Ⅵ
第一章 序論
1.1 引言……………………………………………………..1
1.2 晶體特性及應用………………………………………..2
1.3 動機 ……………………………………………………7
第二章 原理
2.1 Z-Scan…………………………………………………..8
2.2 光束的自聚焦和自發散………………………………..9
2.3 理論計算……………………………………………….11
2.4 非線性吸收效應……………………………………….15
2.5 高階非線性效應……………………………………….18
2.6 數據處裡……………………………………………….21
2.7 串連二階過程的等效三階效應……………………….22
第三章 實驗架構與步驟
3.1 Z-掃描量測架構之架設………………………………27
3.2 光束半徑及脈衝寬度的測量…………………………28
3.3 實驗步驟………………………………………………30
第四章 實驗結果與討論
4.1 Z掃瞄 ……………………………………………………32
4.2 實驗結果………………………………………………….33
4.2-1 非線性吸收 ……………………………………………34
4.2-2.非線性折射率…………………………………………35
4.2-3.串連二階過程的等效三階效應……………………….54
4.3光強度增強的變化…………………………………………61
第五章 結論與展望……………………………...63
參考文獻…………………………………………...65

Reference
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