臺灣博碩士論文加值系統

我們以飛秒Z-掃描實驗技術研究壓電材料鈦酸鉛鑭(PLT)薄膜 和鈮酸鋰(LiNbO3)薄膜的非線性光學特性。雷射光源是鈦-藍寶石雷射，脈衝寬度約為130飛秒，波長為800nm，重覆率為1kHz。在閉孔徑Z-掃描實驗顯示鈦酸鉛鑭(PLT)呈現自聚焦(self-focusing)，非線性折射率n2 = (1.41±0.19)×10-10(esu)，計算其三階非線性磁化率χ(3) = (7.09±0.95) ×10-19(m2/V2)。在開孔徑Z-掃描實驗顯示鈦酸鉛鑭(PLT) 呈現反飽和吸收，其三光子吸收係α3 = (7.0±1.5) ×10-21(cm3/W2)計算其五階非線性磁化率χ(5) = (6.42±1.35) ×10-38(m4/V4)。
在開孔徑Z-掃描實驗顯示鈮酸鋰(LiNbO3) 呈現反飽和吸收，其三光子吸收係數α3 = (2.4±1.3) ×10-20(cm3/W2)，計算其五階非線性磁化率χ(5) = (8.96±3.81) ×10-38(m4/V4)。

The nonlinear optical properties of lanthanum doped lead titanate (PLT) and lithium niobate (LiNbO3) were investigated using Z-scan technique with femtosecond mode-locked Ti-sapphire laser and femtosecond laser amplifier. Our laser light source was a mode-locked Ti-sapphire laser, the output pulse width was approximately 130 femtoseconds at a wavelength of 800 nm, and the repetition rate was 1 kHz. The results demonstrate self-focusing of lead lanthanum titanate (PLT) with a nonlinear refractive index, n2 of (7.08±1.26)×10-11(esu). The real part of the third-order nonlinear susceptibility χ(3) of lead lanthanum titanate (PLT) is(2.49±0.44) ×10-19(m2/V2). The results demonstrate reverse saturable absorption of lead lanthanum titanate (PLT) with a three -photon absorption coefficient, α3 of (2.05±0.54) ×10-21(cm3/W2). The fifth-order nonlinear susceptibility χ(5) ) of lead lanthanum titanate (PLT) is (1.68±2.06) ×10-36(m4/V4). The results demonstrate reverse saturable absorption of lithium niobate (LiNbO3) with a three -photon absorption coefficient, α3 of (3.92±2.05) ×10-21 (cm3/W2). The fifth-order nonlinear susceptibility χ(5) ) of lead lanthanum titanate (PLT) is (1.69±0.82) ×10-36 (m4/V4).

致謝 I
摘要 II
Abstract III
目錄 IV
圖目錄 VI
表目錄 VIII
第一章 簡介 1
參考文獻 4
第二章 理論基礎 5
2.1 Z掃描技術(Z-scan technology) 5
2.1.1 開孔徑Z-掃描技術 10
2.1.2 閉孔徑Z-掃描技術 11
參考文獻 12
第三章 樣品與實驗架構 13
3.1 樣品 13
3.1.1鈮酸鋰薄膜 13
3.1.2鈦酸鉛鑭薄膜 15
3.2 Z-scan實驗系統架構 17
3.3 雷射系統 18
3.4自相關干涉儀 21
參考文獻 22
第四章 實驗結果與討論 23
4.1 線性吸收係數與線性折射率的量測 23
4.1.1線性吸收係數 23
4.1.2線性折射率 23
4.2 鈦酸鉛鑭的非線性折射率量測 26
4.3 鈦酸鉛鑭的非線性吸收係數量測 33
4.4 鈮酸鋰非線性吸收係數量測 39
4.5 鈦酸鉛鑭和鈮酸鋰在開孔徑實驗穿透變化與入射光功率之關係 45
參考文獻 49
第五章 結論 50

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