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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 彭隆瀚(Lung-Han Peng) | |
dc.contributor.author | Jhih-Yong Han | en |
dc.contributor.author | 韓志勇 | zh_TW |
dc.date.accessioned | 2021-06-17T06:15:29Z | - |
dc.date.available | 2018-10-02 | |
dc.date.copyright | 2018-10-02 | |
dc.date.issued | 2018 | |
dc.date.submitted | 2018-08-17 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/71932 | - |
dc.description.abstract | 本論文主要分為三部分:(1)三波混合與準相位匹配之理論之介紹及數值模擬,(2)週期性極化反轉鉭酸鋰之設計與製作,(3)進行折射率差模型以及樣品之光學量測。
本論文利用鎳擴散製程來對鐵電極化反轉區域進行定義,以製作週期性極化反轉鉭酸鋰,分別在週期性極化反轉鉭酸鋰晶片之+z面以及-z面濺鍍20 nm之金屬鎳薄膜,以略低於鉭酸鋰之居禮溫度條件下進行高溫585 ◦C鎳擴散使其表面區域產生折射率之梯度,藉此對準相位匹配所需補償之晶格動量進行縱向空間調制,以此得到更具可調性之寬頻光源。 光學量測部分,利用532 nm綠光雷射作為泵浦光源,對週期為7.63 µm 之極化反轉鉭酸鋰,進行光學參量產生以及光學參量震盪之量測。吾人在對樣品的深度掃描中,將泵浦光源焦點由距離+z面100 µm掃描至20 µm,發現對1020 nm附近之信號光而言,鎳擴散效應對光學參量產生過程可達到8.91 nm之光頻譜位移,而對光學參量震盪過程,則可造成3.27 nm信號光頻譜位移。 此外,在本篇論文利用動量守恆以及能量守恆建立出造成頻譜位移所對應到折射率差解之模型。 | zh_TW |
dc.description.abstract | This thesis is composed of three parts: (1) theory of three-wave mixing and mechanism of quasi-phase-matching (QPM), (2) design and fabrication of periodically poled lithium tantalate, (3) implementation of a numerical model for analyzing the changes in refractive indices, and comparison with the optical measurements.
The patterning of periodic ferroelectric structures with designated and inverted domains is defined by shallow nickel (Ni)-diffusion process followed by pulse electric poling to fabricate periodically poled lithium tantalate (PPLT). To generate a gradient distribution of refractive indices along the depth directions beneath the surfaces, the samples were annealed at a temperature around 585 ◦C, which is slightly below the Curie temperature of the crystal, with 20 nm-thick nickel films deposited on the crystal’s +/-z faces. The latter provides a mechanism to establish effective modulation of the crystal momentum, along the vertical direction, for QPM-parametric generation to obtain a broadband light source. Effective variation in the crystal momentum is confirmed by spectral analysis taken from measurements of optical parametric oscillation (OPO) and optical parametric generation (OPG) with 532 nm wavelength pump to the PPLT crystals with QPM periodicity of 7.63 µm. These optical experiments were taken with the pump laser beam scanned at a distance between 20 to 100 µm beneath the +z face of PPLT. We thereby resolved an 8.91 and 3.27 nm wavelength shift, respectively, for the 1020 nm signal wave from the OPG and the OPO spectra. Moreover, the implementation of a numerical model for analyzing the changes in refractive indices was constructed by considering the laws of momentum and energy conservation for QPM processes in this thesis. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T06:15:29Z (GMT). No. of bitstreams: 1 ntu-107-R05941026-1.pdf: 5297703 bytes, checksum: 857f389acf40a77c82159783fdba8e48 (MD5) Previous issue date: 2018 | en |
dc.description.tableofcontents | 第一章 簡介...................................1
1.1 研究背景與動機........................1 1.2 常用非線性晶體材料....................2 1.3 鉭酸鋰之材料特性......................5 1.3.1 鉭酸鋰之鐵電性........................5 1.3.2 鉭酸鋰的結構..........................8 1.3.3 長晶技術..............................9 1.4 週期性鐵電疇反轉.......................11 1.4.1 高電壓致鐵電疇反轉.....................11 1.4.2 金屬高溫擴散致表面鐵電疇淺層反轉機制.....12 1.5 論文內容概述...........................14 第二章 非線性光學與相位匹配理論..................15 2.1 非線性頻率轉換與相位匹配................15 2.1.1 非線性介質中之三波耦合方程式............15 2.1.2 基頻光場無損耗之二倍頻..................17 2.1.3 基頻光場無損耗二倍頻之溫度頻寬..........19 2.1.4 基頻光場考慮損耗之二倍頻................21 2.1.5 基頻光場考慮損耗二倍頻數值分析...........22 2.1.6 基頻光考慮高斯光束分布之二倍頻...........25 2.2 雙折射相位匹配理論......................25 2.3 準相位匹配理論..........................27 2.3.1 同調長度...............................27 2.3.2 一維準相位匹配..........................28 2.3.3 一維週期性鐵電疇反轉結構之離散傅立葉分析(discrete Fourier transform, DFT)........................33 2.3.4 二維準相位匹配..........................42 2.3.5 二維週期性鐵電疇反轉結構之離散傅立葉分析(discrete Fourier transform, DFT)........................44 2.4 光學參量震盪器理論.......................56 2.4.1 傳統光參理論............................56 2.4.2 光學參量振盪器理論.......................59 第三章 鉭酸鋰週期性鐵電疇反轉之研究...............61 3.1 高電壓極化反轉之實驗架設.................61 3.2 反轉電壓的設計..........................64 3.2.1 鐵電疇反轉模型..........................65 3.2.2 反轉電壓的設計..........................68 3.3 鐵電疇橫向遷移率........................71 3.4 週期性極化反轉鉭酸鋰製程.................84 3.4.1 基板方向鑑定............................84 3.4.2 製程流程圖..............................86 3.4.3 鐵電疇之觀察............................89 第四章 模型建立與光學量測........................94 4.1 頻譜位移之模型..........................94 4.2 光學量測與分析..........................105 4.2.1 樣品擴散層觀察..........................105 4.2.2 光學量測架設............................106 4.2.3 光學參量產生(optical parametric generation, OPG)量測結果.........................................109 4.2.4 光學參量震盪器 (optical parametric oscillator, OPO)量測結果...................................115 4.2.5 差頻轉換之準相位匹配晶格補償動量探討.....122 4.2.6 折射率模型求解三波折射率變化量...........123 第五章結論與未來展望............................133 5.1 結論...................................133 5.2 未來展望................................134 參考資料........................................136 附錄............................................143 | |
dc.language.iso | zh-TW | |
dc.title | 利用鎳擴散製程於週期性極化反轉鉭酸鋰垂直調制準相位匹配結構 | zh_TW |
dc.title | Vertically Spatial Modulation of Quasi-Phase-Matching Structures on Periodically-Poled Lithium Tantalate Using Nickel-Diffused Process | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 王維新(Way-Seen Wang),孔慶昌(Andy. H. Kung),蔡宛卲(Wan-Shao Tsai) | |
dc.subject.keyword | 鉭酸鋰,週期性極化反轉鉭酸鋰,鐵電材料,鐵電疇,非線性光學,準相位匹配,三波混合,光學參量震盪器, | zh_TW |
dc.subject.keyword | Lithium tantalate,PPLT,Ferroelectric material,Ferroelectric domain,Nonlinear optics,Quasi-Phase-Matching,Three-wave mixing,Optical parametric oscillator, | en |
dc.relation.page | 151 | |
dc.identifier.doi | 10.6342/NTU201802718 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2018-08-18 | |
dc.contributor.author-college | 電機資訊學院 | zh_TW |
dc.contributor.author-dept | 光電工程學研究所 | zh_TW |
顯示於系所單位: | 光電工程學研究所 |
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