利用雙色光短脈衝雷射產生之電漿態激發寬頻兆赫波

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研究生：	鄭碩賢 Cheng, Shuo-Hsien
論文名稱：	利用雙色光短脈衝雷射產生之電漿態激發寬頻兆赫波 Broadband Terahertz Emission by two-color Laser-Induced filament in isotropic media
指導教授：	潘犀靈 Pan, Ci-Ling
口試委員:	趙如蘋張存續
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 光電工程研究所 Institute of Photonics Technologies
論文出版年：	2014
畢業學年度：	102
語文別：	英文
論文頁數：	80
中文關鍵詞：	寬頻兆赫波
外文關鍵詞：	broadband terahertz
相關次數：	點閱：83 下載：0
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利用聚焦短脈衝雷射產生之空氣電漿所輻射出的寬頻兆赫波，其理論可以用瞬時光電流模組來解釋，空氣分子經由聚焦的雙色短脈衝雷射離子化產生電漿，自由電子受到雙色雷射脈衝的驅動產生具有方向性的瞬時光電流，而這個瞬時光電流被視為是寬頻兆赫波的發射源。其中，雙色雷射脈衝之間的相位差是一個影響兆赫波強度的重要因素，模擬結果顯示，相位差為π/2時產生之兆赫波強度比起相位差為0時強很多，因為較為不對稱的電場分佈會得到較強的方向性電流。其他影響兆赫波強度的因素也會在論文中被討論，例如入射雷射強度、二倍頻轉換效率、波長和脈衝寬度等。此外，瞬時光電流模組也用來討論不同階的混頻光對於兆赫波產生的可能性。
此外，利用固態材料可以產生比氣體更高密度的電漿的特點，實驗上我們亦利用雙色短脈衝雷射打入石英玻璃，量測經由石英玻璃內部電漿產生的兆赫波，並與用空氣電漿產生的兆赫波訊號做比較。

Laser-induced gas-plasma or filament can be used as the emitter of intense, coherent and broadband terahertz (THz) wave. The generation process can be well-described by transient photocurrent model, in which the transient current caused by two-color laser field is the source of broadband THz radiation. The air molecules are ionized by focused two-color laser field, and free electrons driven by the laser field will form the directional transient current radiating the THz wave. The relative phase between two-color laser field is an important factor that will affect the output THz yield. Simulation of THz emission by the transient photocurrent model is carried out in this work. Because of the stronger directional transient current under the influence of asymmetric electric field, the THz yield will be much stronger when the relative phase equals to π⁄2 than 0. The dependences of other parameters on generating THz radiation are also discussed. These include pumping intensity, power conversion efficiency, wavelength, and pulse duration. The dependence of pumping intensity on THz emission has been compared to the experimental results. Furthermore, by multi-color laser field are also investigated..
On the other hand, the plasma density is much higher in solid-state materials than that in the gas. Therefore, we also conducted studies of THz generation from solid-state material, fused silica.

摘要    i
Abstract    ii
致謝    iii
Table of Contents    iv
List of Figures    vi
List of Tables    ix
Chapter1 Introduction    1
1-1 Terahertz Technology    1
1-2 Terahertz wave air photonics    3
1-2-1 Generation of terahertz wave with laser-induced air plasma    3
1-2-2 Detection of terahertz wave with laser-induced air plasma    4
1-3 Motivation and objectives    5
1-4 Organization of this thesis    5
Chapter2 Theoretical Background    7
2-1 Terahertz wave generation from laser-induced air plasma    7
2-1-1 Four wave mixing model    9
2-1-2 Transient photocurrent model    11
2-2 Terahertz wave detection methods    16
2-2-1 Terahertz wave detection method based on electro-optic sampling technique    16
2-2-2 THz-air-biased coherent detection technique    19
Chapter3 Simulation work of transient photocurrent model    21
3-1 The concept of transient photocurrent formed in air plasma    21
3-2 Fundamental and second harmonic mixing    27
3-2-1 The dependence of THz generation on relative phase    33
3-2-2 The dependence of THz generation on pumping intensity    34
3-2-3 The dependence of THz generation on conversion efficiency    36
3-2-4 The dependence of THz generation on pulse duration    37
3-2-5 The dependence of THz generation on wavelength    38
3-3 Fundamental and third harmonic mixing    39
3-4 Fundamental, second and third harmonic mixing    41
3-5 Non-harmonic mixing    44
Chapter4 Experimental Setup and System Performance    46
4-1 Laser System (Tsunami, Spitfire)    46
4-2 Terahertz time-domain spectroscopy system with detection based on electro-optic sampling    50
Chapter5 Experimental results    55
5-1 THz generation from laser-induced air plasma    55
5-1-1 The dependence of THz generation on incident pumping power    55
5-1-2 The dependence of THz generation on rotating angle of BBO crystal    59
5-1-3 The dependence of THz generation on distance from BBO crystal to plasma    60
5-2 THz generation from fused silica    62
5-2-1 The dependence of THz generation on incident pumping power    62
5-2-2 The dependence of THz generation on rotating angle of BBO crystal    65
5-2-3 The dependence of THz generation on distance from BBO crystal to plasma    66
5-3 Comparison of air plasma and fused silica    67
Chapter6 Construction work of THz-air-biased coherent detection    69
6-1 Experimental setup    69
6-2 Precaution and Operation procedure    72
6-3 Discussion    73
Chapter7 Conclusions and Future works    75
7-1 Conclusions    75
7-2 Future works    75
Reference    77

                                

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