臺灣博碩士論文加值系統

鈮酸鋰由於易於生長，且具有高的非線性係數、良好的光學品質，因而廣泛地應用於光頻率轉換、電光調制、表面音頻濾波、光折變記錄等領域。
本論文之研究目的在於發展出鈮酸鋰晶纖之準相位匹配結構，以應用於波長轉換器，利用雷射加熱基座生長法之架構外加一高電場導致週期性區域反轉結構之鈮酸鋰晶纖 。在結構設計方面，我們以串接二階非線效應作為基礎，設計了在1.55□m光纖通訊波段之波長轉換器，其對幫浦光及信號光之頻寬分別為0.78nm和80nm。在實驗上，我們成功地製作出以a軸生長之單域鈮酸鋰晶纖，並進而利用外加不同的週期電場強度探討區域反轉的機制。我們可以成功地在居里溫度附近以1kV/mm之外加電場在直徑為190□m之鈮酸鋰晶纖上，製作週期為18.9□m的週期性區域反轉結構，此技術將有助於發展高效率的非線性光學頻率轉換技術與元件。

Lithium niobate(LiNbO3) has been widely used in optical frequency converter, electro-optical modulator, surface acoustic waveguide filter, and photorefractive recording due to its ease of growth, high nonlinear coefficient, and excellent optical quality.

In this thesis, we report the use of laser-heated-pedestal growth technique on LiNbO3 crystal fibers with in-situ electric field. In the process of the wavelength conversion, based on the cascaded second-order nonlinearity, we designed a 1.55-mm-band wavelength converter in optical communication, which has spectral widths for the pumping source and the output signal of 0.78nm and 80nm, respectively. In the experiment, we had grown a-axis single domain LiNbO3 crystal fiber. We also studied the dynamics of poling mechanism for various electric field. We applied 1kV/mm electric field near the Curie temperature on the LiNbO3 with the diameter up to 190mm and got a periodic domain structure of 18.9mm. The techniques are expected to be useful for in high-efficient nonlinear optical applications.

中文摘要Ⅰ
英文摘要Ⅱ
圖目錄Ⅲ
表目錄
第一章緒論1
第二章相位匹配原理與區域反轉機制4
2.1雙折射相位匹配4
2.2準相位匹配12
2.3區域反轉機制19
2.4區域反轉結構製作方式22
第三章單域鈮酸鋰晶纖之製作26
3.1生長方法與架構26
3.2鑲埋、研磨、拋光及蝕刻33
3.3特性量測40
第四章準相位匹配元件之研製47
4.1元件設計47
4.2腔外高壓電場極化反轉51
4.3腔內外加電場極化反轉55
4.4結果與分析60
第五章結論與未來展望61
參考文獻62
中英對照表67

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