非週期性晶格極化反轉鈮酸鋰作為有效率的二倍頻和模態轉換器之研究

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姓名

張正良(Cheng-Liang Chang) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

非週期性晶格極化反轉鈮酸鋰作為有效率的二倍頻和模態轉換器之研究
(Efficient Second-Harmonic Generator and Electro-optic Polarization-Mode converter in Single Aperiodically Poled Lithium Niobate)

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摘要(中)

積體光學(Integrated Optics, I.O.)是將不同的光學元件整合在同一個基板上，例如鈮酸鋰晶體。若在晶體上做非週期性的反轉晶格(Aperiodic Optical Superlattices ,AOS)，則可以利用準相位匹配的方式來滿足多個波長轉換所需之相位補償。
我們設計且做了第一個同時具有兩種功能( TE-TM mode converter和Wavelength Conversion )的非週期晶格反轉結構。利用APLN (Aperiodic poled LiNbO3; PPLN) 當作在C band 的主動式窄頻寬多波長濾波器和多波長倍頻器。該結構同時滿足4 個波長在1550nm 附近的電光效應和二倍頻波長轉換之準相位匹配條件的反轉區塊分佈。
在兩公分長的 APLN 元件，能夠同時使得 4 個特定波長之二倍頻轉換效率大於0.15%/W( 設計為~0.165%/W)。外加約1200(V/mm)的電場(設設計值為1000V/mm)，能夠有大於90%以上的穿透率(設計上~100%)，每個波長的頻寬約為1.16nm。和串接的APLN結構相比二倍頻轉換效率有 2.45 倍的提升、濾波的頻寬則有 2.6 倍的窄化。

摘要(英)

Integrated optics refers to the integration of various optical devices and components on a single common substrate, for example, lithium niobate. an aperiodic domain structure is known to provide more than one reciprocal vector to simultaneously compensate wave-vector mismatches of a plurality of wave-energy coupling processes in a quasi-phase-matched (QPM) material.
We report the design and first experimental on constructing an aperiodically poled LiNbO3 for optimally integrating both the electro-optic and nonlinear optic properties of a material to enable high-efficiency dual optical device functions.
Simultaneous transmission of >90% (~100% in design) of 4 telecom wavelengths with each a bandwidth of ~1.16 nm was achieved in a 2-cm long APLN device when an electro-optic field of ~1200 V/mm (~1000 V/mm in design) was applied. Single-pass SHG conversion efficiency is about 0.15%/W(~0.165% in design). 2.45-times second-harmonic-generation conversion efficiency enhancement and EO transmission bandwidth has 2.6-times reduction over a conventional cascaded periodically poled LiNbO3 is obtained with such a device.

關鍵字(中)

★ 二倍頻
★ 電光元件
★ 非週期性晶格反轉鈮酸鋰

關鍵字(英)

★ Aperiodically poled lithium niobates
★ Second harmonic generation
★ Electro-optically active device

論文目次

第一章緒論 1
1-1 簡介 1
1-2 研究動機 2
1-3 內容概要 3
第二章理論 4
2-1 準相位匹配原理 4
2-2 週期性反轉之鈮酸鋰晶體的電光效應 8
2-3 非週期性反轉之鈮酸鋰晶體 16
第三章元件設計、模擬以及製程部份 19
3-1 元件設計-模擬退火法 19
3-2 元件設計-電極設計 23
3-3 元件製程 24
第四章實驗量測及結果分析 32
4-1 實驗架構 32
4-2 實驗量測結果 35
4-2-1 Single Structure APLN量測結果 35
4-2-2 Cascade APLN 量測結果 38
4-3 實驗誤差分析 42
4-3-1 APLN 晶體溫度不均模擬 42
4-3-2 APLN 的傅立葉分析 46
第五章結論與未來展望 50
5-1 結論 50
5-2 未來展望 50
5-3 EO Q-switch SHG APLN 量測結果 51
參考文獻 54

參考文獻

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指導教授

陳彥宏(Yen-Hung Chen)

審核日期

2008-7-14

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