臺灣博碩士論文加值系統

摘要

在本論文中， 我們使用四波混合的理論作為我們實驗的方法並且測量其 值。此次的樣品我們選用的是 或 PLZT (9.5/65/35). 或PLZT (9.5/65/35) 鐵電陶瓷材料現今被廣泛使用於電光元件上，主要是在於此材料有良好的鐵電特性、高穿透性及良好的光電效應等優點以及具有較大的 和 值。
我們將簡介四波混合的原理及應用，像是全像素、光源追蹤、相位偶合等。在本實驗中，我們嘗試藉由提供磊浦光以及外加電場來提高我們的訊號光光強。

Abstract

In the thesis, we used the theory of four wave mixing to be our method and calculated values. The sample we choosing was or PLZT (9.5/65/35). PLZT (9.5/65/35) ceramic has nowadays been used for electrooptic devices due to its interesting ferroelectric properties, high transparency, its well-performed electroooptic effects even in the form of non-single crystal and it has large and coefficients.
We will introduce the theory of four wave mixing and its application, likes holography, beam tracking, phase conjugation and so on. In the experiment, we try to increase the intensity of signal beam by applying pump beams and external dc field.

Table of Contents
Abstract……………………….……………………………………………...I
Table of Contents……..………………………………………………III
List of Figures………………………………….….……..…..……….. IV
Chapter 1 Introduction 1
1-1. Properties of fused silica glass……………………………………………1
1-2. The composition of PLZT………………………………………………...2
1-3. The Effect of Electric Field in PLZT……………………………………...3
1-4 The Effect of Temperature in PLZT……………………………………. . .4
1-5. Hysteresis………………………………………………………………....5
1-6. The Objective and Method of Study……………………………………...7

Chapter 2 Theoretical Analysis 8
2-1. The Origin of Nonlinear Optics…….…………………………….…...….8
2-2. Degenerate Four-Wave Mixing……………………………………….....10
2-3. Wave-equations for phase conjugation……….……………………....…11
2-4. Calculation for χ(3) Values…………............................................... ..…13

Chapter 3 Experimental Procedure 16
3-1. Sample Preparation………………………………………………………16
3-1-1. Sample Characteristics………………….……………………………16
3-1-2. Sample Preparations of PLZT………………………………………..17
3-2. Experimental Instrument…….…………………………………….….…18
3-3. Experimental Setup………...…………………………………….…..….19
3-4. Experimental Measurement……………………………………………..19

Chapter 4 Results and Discussion 21
4-1 Pumping beam in PLZT…………………………………………………21
4-1. Electric Field In PLZT…………………………………………………...22
4-3 Comparison for Different External Electric Field………………………..22
4-4. Hysteresis in PLZT…………………………………………………... …23
4-5. Calculation for values…………………………………………...…23
4-6. Comparison for ……………………………………………….. . ...24

Chapter 5 Conclusions and Future studies 25

References 26

List of Table

Table4.5.1 for PLZT samples at external electric fields………………….24

List of Figures

Figure 1-1. The Schematic representation of (a) ordered crystalline form and (b) random network or glassy form of SiO2.……………………… 30
Figure 1-2. (a) The basic structure of SiO2 or SiO?4 tetrahedron. (b) The distance and angle of an ideal SiO2 molecule.…. …………………………..31
Figure 1-3. The temperature and pressure of SiO2 phase diagram.……………..32
Figure 1-4. The perovskite unit cell of PLZT……………………….….33
Figure 1-5. The phase diagram of PLZT…………………………………………….34
Figure1-6. (a) Effective birefringence as a function of electric field and polarization. (b) For a 9/65/35 PLZT ceramic at room temperature. (c) The polarization values at stepwise increasing electric field were achieved as shown in the hysteresis loop………………………………………………………………….35
Figure1-7. (a) Hysteresis loop for polarization. (b) Domain microstructure without an applied field. (c) Domain growth in direction of an applied field………………………………………………………...36
Figure 1-8. The hysteresis loop and birefringence in different composition of PLZT……………………………..……………………………..37
Figure 2-1. Schematic of four wave-mixing………………………….………...38
Figure 3-1. The typical hot pressing setup for fabricating PLZT ceramics……..39
Figure 3-2. Experimental Setup…………………………………………………40
Figure 4-1. The lower curve is for signal intensity without pumping beam on the PLZT sample, V=0.The upper curve is for signal intensity with pumping beam on the PLZT sample, V=0…………………………..41
Figure 4-2. DFWM of PLZT (9.5/65/35) at 0.62mm thick under positive external electric field. The external electric field are 0V/mm, 800V/mm, 1000V/mm and 1200V/mm in the mode without using polarizers….42
Figure 4-3. DFWM of PLZT (9.5/65/35) at 0.62mm under positive external electric field. The external electric field are 0V/mm, 800V/mm, 1000V/mm, 1200V/mm in S-S mode, respectively…………………43
Figure 4-4. The DFWM hysteresis loop of PLZT………………………………44

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