本論文利用準相位匹配理論，研究非線性光學之頻率轉換。我們於厚度0.75mm的鉭酸鋰晶體製作出週期性極化反轉結構，達到準相位匹配而進行頻率轉換。
鉭酸鋰晶體結構設計分為兩部份的頻率轉換結構之串聯，其晶體總長度為20mm，其操作溫度為140度。第一部分為OPO結構，長為10mm，由532nm綠光作為泵浦光入射，經過晶體後進行頻率轉換，產生訊號光為1300nm與閒置光為900nm。第二部分為三組倍頻轉換與和頻轉換結構之並聯結構，長為10mm，各別為1300nm倍頻轉換成650nm紅光、900nm倍頻轉換成450nm藍光、1300nm與1064nm和頻轉換成585nm黃光。
由光學量測分析後，本實驗所輸出之白光的CIE 座標為(0.3626,0.3547,0.2827)，色溫為4835K。

This thesis is a study based on quasi-phase-matching frequency conversion in nonlinear optics. We fabricate periodically poled structures on 0.75mm thick congruent lithium tantalite(CLT) substrates to realize the condition of quasi-phase-matching (QPM) for frequency conversion.
There are two QPM patterns cascadedon the CLT substrate of the structure on LT substrate at a crystal length of 20mm. The fist part in the above device is a 10mm-long PPLT structure for the optical parametric oscillation (OPO). It converts a 532nm pump green laser into a signal 1300nm wavelength and a idler 900nm wavelength. The second part contains the PPLT parallel three sets of structures of 10 mm length for the second-harmonic generation(SHG) and sum-frequency generation(SFG). It is designed for converting the 1300nm and 900nm wavelength into 650nm and 450nm SHG separately. And others, it is for combinig the 1300nm and the 1064nm into 585nm by the SFG process.
After optical measurement, the CIE coordinates of the white laser is (0.3626,0.3547,0.2827). And, The correlated color temperature (CCT) is 4835K.

第一章 緒論 1
1.1 研究背景與動機 1
1.2 非線性材料介紹 3
1.3 鉭酸鈮晶體介紹 4
1.3.1基本特性 4
1.3.2 相變化模型 5
1.4 週期性區域反轉之製作方法 7
1.5 非線性光學之頻率轉換簡介 8
1.5.1 頻率轉換 8
1.5.2 光學參量振盪器 9
第二章 相位匹配理論 10
2.1 非線性頻率轉換 10
2.1.1 二倍頻 13
2.1.2 平面波近似 14
2.1.3 高斯波近似 17
2.2 準相位匹配 19
2.3 光參產生和光參共振之理論 24
2.3.1 傳統光參產生及準相位匹配光參產生 24
2.3.2 波長可調性 27
2.3.3 光參產生理論 27
2.3.4 光學參量振盪器理論 30
第三章 四色白光雷射晶體研究 32
3.1 晶體週期設計 32
3.1.1光參振盪器晶體週期設計 32
3.1.2 倍頻晶體週期設計 34
3.1.3 白光晶體設計 37
3.2 晶體製作流程 39
3.2.1 極化反轉模型 40
3.2.2 高電壓致極化反轉 42
第四章 光學量測與分析 44
4.1光學量測之前置作業 44
4.1.1 晶體拋光研磨 44
4.1.2 溫控系統製作 45
4.1.3 泵浦雷射光源 46
4.2 光路設計計算 47
4.2.1 光學參量振盪器 47
4.2.2 光路設計 52
4.3 量測架設與分析結果 56
第五章 結論與未來展望 62
5.1 結論 62
5.2 未來展望 63
參考文獻 64

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