臺灣博碩士論文加值系統

石英是地球上的重要礦物之一,亦是岩石的主要結構,它的主要成份是二氧化矽,是所有礦物中在長溫下較為穩定的變體,因此許多專家學著對於它的物理現象及光學特性加以研究.
在1961年Franken和他的夥伴利用一Ruby雷射光束,通過一石英晶體,結果發現了兩倍Ruby雷射波長產生,此現象即為二次諧波產生(SHG),之後許多專家學者便對SHG作深入的研究與探討.
在實驗中,我們將石英晶體磨成粉末,置於SiO2玻璃平行板中,利用電暈場極化(Corona poling)方式,來扭曲或旋轉晶格,並觀察及紀錄SHG的強度,之後,我們加入少許的H2O,以減少樣品的反射及繞射,並觀察SHG的變化,以及計算樣品的d值.

The quartz is one of the important minerals to constitute rocks, its main elements is SiO2, which is in the rocks of many congenialities, and is one of the solids that stabilize most other rocks under the normal temperature. Therefore, many researchers use quartz to study its physical properties especially optical characteristics.
Franken and his partners in 1961 used the Ruby laser beam, they passed the beam to a crystal of quartz,and found the ultraviolet ray of doubled frequency, this phenomenon is the second harmonic generation (SHG). Many researches concentrated on the research for optical properties resulted from SHG, brought new findings in the field of nonlinear optics. At present, extensive researches of SHG on metal surface, surface of the semiconductor, solid and the interface of the liquids, air and the interface of the liquids, etc. have been performed.
In our experiment, we studied the nonlinear effect in quartz powders, used the corona poling technique, which distorts the crystal, and changes crystal’s refraction and dispersion. We used the 1064nm Nd:YAG laser as fundamental radiation, and through a whole set of optics, we observed the SHG in quartz powders mixed with water.

Abstract..................................................... I
Table of Contents.............................................II
List of Figures...............................................V
Chapter 1 Introduction 1
1-1. The Physical Character and Structure of Quartz Crystal.2
1-2. Glass..................................................4
1-3. The Objective and Method of Study......................6
Chapter 2 Theoretical Analysis 8
2-1. Nonlinear Optics.......................................8
2-1-1. Origin of Nonlinear Optical Phenomenon.............8
2-1-2. Nonlinear Optical Susceptibility X.................9
2-2. Principle of Frequency Doubling........................11
2-3. Corona Poling..........................................15
2-4. Maker Fringes..........................................17
2-5. Calculation for d value................................20
Chapter 3 Experimental Procedure 25
3-1. Sample Preparation.....................................25
3-1-1. Sample Characteristics.............................25
3-1-2. Preparations.......................................26
3-2. Experimental Setup for Measurement.....................27
3-3. Experimental Setups for Measurement....................29
Chapter 4 Results and Discussion 31
4-1. NLO Effect in Glass....................................32
4-2. SHG Effect in Sample...................................33
4-2-1. The relation between quartz crystal and quartz powder........................................................33
4-2-2. The SHG in quartz powder by corona poling..........33
4-2-3. The SHG in quartz powder mixed with................34
4-2-4. The quartz powder corona poled for 24 hours........35
4-3. SHG effect in Y-cut quartz crystal.....................36
4-4. SHG effect in quartz powder by corona poling...........37
4-5. Analysis and Results of d Values.......................40
Chapter 5 Conclusions 41
References 42

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