臺灣博碩士論文加值系統

我藉由外加水和鹽水條件，來增強SHG訊號。

We had performed some experiments on fused SiO2 glass samples . Then we used Maker Fringes method to calculate the nonlinear optical coefficients in the SiO2 samples . In our calculations , deff is about 1pm/V which is close to the values reported by other researchers [8,10,12] . And we believe that the dipole moment forms not only on the glass surface but in the bulk material near the top surface of the sample . The impurities cause some dipole moment formed near the anode of the glass (as shown in Fig 5-1 ) .
In particular , oxygen and hydrogen or other ionized impurities will obtain the energy from the corona poled process , and they are able to form another new compounds or polymers on glass surface and in the bulk .
The thickness of the depletion region or nonlinear region is about several micrometers , formed by impurities in the glass and corona poling . So we want to increase the deff value by add some outer conditions like water drops and salty water drops on the glass sample .
But , there are still many problems need to be solved , like what is the real reason of the ion effects to the glass and how to further increase the nonlinear region by another methods .

Contents
Contents I
Chapter 1 Introduction 1
1-1 Properties Of Fused Silica Glass 3
1-2 Organic Polymers 4
1-3 Defects In SiO2 5
1-4 Method Of Study 6
Chapter 2 Theoretical Analysis 7
2-1 Nonlinear Optics 7
2-2 Principle Of Optical Frequency Doubling 8
2-3 Effects Of Corona Poling In Silica Glass 12
2-3-1. Corona Poling 12
2-3-2 . Space-Charge Model 14
2-3-3 . Space-Charge Polarization In Glass 15
2-3-4 . Poling time and Speed of Depletion region formation 16
2-4 Electric Field Induced Second Harmonic Generation 17
2-5 Maker Fringes 18
2-6 Calculation of the values 20
Chapter 3 Experiment Procedure 23
3-1 Sample Preparation 23
3-2 Instrument 24
3-3 Methods Of Corona Poling 25
3-4 Electric Field Induced SHG 25
3-5 Experimental Setup 26
Chapter 4 Results And Discussion 29
4-1 Frozen-in Electric Field Or Oriented Dipole 30
4-2 Dynamics Of SHG In Fused Silica 31
4-3 32
4-3-1. NLO Effect In SiO2 Glass By Corona Poling At 2700C 32
4-3-2 . Possible Reasons For SHG In Poled Glass 35
4-3-3 . Nonbridging Oxygen Hole Center 40
4-4 41
4-4-1. NLO Effect in SiO2 Glass By Corona Poling At In 2700C In Wet Environment 41
4-4-2 . Possible Reasons For SHG Enhancement By Water In Poled Glass 42
4-5 46
4-5-1 . NLO Effect In SiO2 Glass By Corona Poling At 2700C In Salty Environment 46
4-5-2 . Possible Reasons For SHG Enhancement By Salty Water In Poled Glass 47
4-6 49
4-6-1 . Time Factor For Corona Poling 49
4-6-2 . Temperature Factor For Corona Poling 50
4-6-3 . Possible Reasons For Temperature Dependent Factor 50
Chapter 5 Conclusion 53

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