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研究生:李森陽
研究生(外文):Mori Lee
論文名稱:鈮酸鋰晶體粉末非線性光學研究
論文名稱(外文):The study of nonlinear optics of Lithium Niobate powder at corona poling and H2O
指導教授:吳渝
指導教授(外文):A.Y. Wu
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:電機工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:英文
論文頁數:67
中文關鍵詞:非線性光學粉末鈮酸鋰二氧化矽玻璃二次諧波產生
外文關鍵詞:nonlinear opticspowderLithium NiobateSiO2 galssSHG
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LiNbO3為非中心對稱離子晶體,具有優異的非線性光學效應,在強雷射光場的作用下,產生各種非線性光學效應。倘若在晶體中加加一些參數,如加純水或改變其電壓,則高階非線性光學 會出現,這對整體的非線性光學效應有增強或減弱的效果。
在這篇論文中,我們研究鈮酸鋰晶體在粉末形態下的非線效應,並以波長為1064μm的Nd:YAG雷射為光源,測量其溫度和倍頻光強度的關係。
實驗結果是用Maker Fringes的技術。這個方法可以在不同的電壓下得到我們所需的Maker Fringes,借此來計算非線性光學係數deff。結果證明 是因為電壓增加而增加,所以在樣品加電壓或加水是可以引導出和增強二次諧波產生。

Lithium Niobate (LiNbO3) is a non-centralsymmetric ionic crystal, which possesses excellent nonlinear optical properties and may be used for generating many nonlinear optical effects when irradiated by high power laser. If we apply an external parameters, such as pure water or change its temperature upon the material under the irradiation of laser, ,the higher order nonlinear optical coefficient will appear, which may enhanced or reduced the total nonlinear optical intensity.
In this thesis, we study the nonlinear effect of LiNbO3 in powder form. We chose a Nd:YAG laser with wavelength 1.064μm as the fundamental light source and measure to obtain the relationship between the temperature and the intensity of the second harmonic generation.
The experimental results were analyzed by using the Maker fringe technique. The method can be used for calculating the nonlinear optical susceptibility deff under different temperatures. Our results showed that could be enhanced by increasing voltage. So by increasing voltage or adding H2O the SHG intensity on the sample can be induced and enhanced.

Acknowledge.…………………………………Ⅰ
Abstract…………………………………………Ⅱ
Table of Content………………………………Ⅲ
List of Figures………………………………Ⅳ
Chapter 1 Introduction
1-1. The structure of LiNbO3……………………………………………2
1-2. Single crystal growth………………………………………………4
1-3. Electric and optical characteristics of LiNbO3………………………5
1-4.ThePurposeandMethodof Study……………………………………6
Chapter 2 Theoretical Analysis
2-1.Linear and Nonlinear Optics…………………………………………8
2-1-1.Original of Nonlinear Optical Phenomenon…………………8
2-1-2.Nonlinear Optical Susceptibility χ………………………10
2-2. Principle of Frequency Doubling…………………………………11
2-3.The Field Induced Second Harmonic Generation…………………15
2-3-1.The Effect of SHG Intensity under dc Electric Field………17
2-3-2.The Effect of SHG Intensity under Corona Poling…18 2-4.Electro-Optic Effect…………………………………………...……21
2-5.Maker Fringes and Calculating for dij Values………………………24
Chapter 3 Experimental Procedure
3-1. Sample preparation ………………………………………………30
3-2. Instrument.………………………………………………………31
3-3. Experimental Setup.……………………………………………32
3-4. Experimental Measuerment.……………………………………33
Chapter 4 Results and Discussion
4-1.NLO by Corona Poling on LiNbO3 powder Form………………38
4-2. NLO Effect by Adding water on LiNbO3 Power Form…………42
Chapter 5 Conclusions
References………………………………………………………47

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