用於雷射驅動高階諧波研究之頻域干涉儀的發展

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研究生：	古佳文 Jia-Wen Gu
論文名稱：	用於雷射驅動高階諧波研究之頻域干涉儀的發展 Development of the Frequency-Domain Interferometry for the Research of Laser-Driven High-Order Harmonic Generation
指導教授：	朱旭新 Hsu-hsin Chu
口試委員:
學位類別：	碩士 Master
系所名稱：	理學院 - 物理學系 Department of Physics
論文出版年：	2025
畢業學年度：	113
語文別：	英文
論文頁數：	75
中文關鍵詞：	高階諧波產生、電漿、波導、頻域干涉儀、縱向診斷
外文關鍵詞：	high-order harmonic generation, plasma, waveguide, frequency-domain interferometry, longitudinal diagnosis
相關次數：	點閱：16 下載：0
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在高階諧波產生研究中，相位匹配佔有很重要的地位。實現相位匹配需要對實驗條件進行精確的測量與控制，特別是測量由超短雷射脈衝所產生的電漿密度。本論文聚焦在發展頻域干涉技術來測量毛細管光波導內的電漿密度。基於此技術，我們成功診斷了高階諧波產生過程中所生成的瞬態電漿。這些結果有助於實現高階諧波產生的相位匹配，進而提升短波長輸出的效率。

In high-harmonic generation research, phase matching plays a crucial role. Achieving phase matching requires precise characterization and careful control of experimental con-
ditions, particularly in measuring the plasma density produced by ultrashort laser pulses. This thesis focuses on the development of the frequency-domain interferometry for the measurement of the plasma density in a capillary waveguide. Based on this technique, we successfully diagnose the transient state of the plasma generated in the high-harmonic generation process. These results are beneficial for achieving phase matching of higher-harmonic generation, leading to eﬀicient output at shorter wavelengths.

摘要 ix
Abstract xi
Contents xiii
List of Figures xv
List of Tables xvii
Abbreviation Table xix

Introduction 1
1 Three-Step Model ............................................................. 2
2 Phase-Mismatch in High-order Harmonic Generation........................ 3
2.1 Wavenumber Mismatch due to Neutral Gas Dispersion .............. 5
2.2 Wavenumber Mismatch due to Plasma Dispersion ................... 6
2.3 Phase Mismatch due to Intrinsic Dipole Phase ....................... 6
2.4 Phase Mismatch due to Geometrical Phase Shift..................... 7
2.5 HHG with Gas-Filled Waveguide...................................... 8
3 Longitudinal Diagnosis........................................................ 9

Frequency-Domain Interferometry (FDI) 11
1 Principle....................................................................... 11

Method 17
1 Experimental Setup ........................................................... 17
1.1 Capillary ............................................................... 17
1.2 Driving Beam .......................................................... 18
1.3 Probe Beam............................................................ 19
1.4 Diagnostic System ..................................................... 24
2 FDI Parameter Design ........................................................ 27
2.1 Polarization ............................................................ 27
2.2 Pulse Duration......................................................... 27
2.3 Delay................................................................... 27
2.4 Environment ........................................................... 28
3 Temporal Alignment .......................................................... 28
3.1 Coarse Tuning ......................................................... 28
3.2 Fine Tuning with Frequency-Domain Interferometry ................. 29
3.3 Fine Tuning with Sum-Frequency Generation ........................ 29

Result 33
1 Phase and Group Delay Retrieval Process ................................... 33
2 Validity of FDI ................................................................ 35
2.1 Relationship between Spectral Modulation and Delay................ 35
2.2 Phase Measurement ................................................... 36
3 Guiding Quality of the Driving Beam ........................................ 40
4 Plasma Diagnostics Inside the Capillary ..................................... 43
4.1 Plasma Diagnostics with Argon ....................................... 46
5 Measurement of High-Density Plasma........................................ 48

Discussion and Conclusion 51
1 Discussion ..................................................................... 51
1.1 Extinction Ratio and Interference between the Driving Beam and
the Probe Beam ............................................................... 51
1.2 Probe Beam Ionize Gas ............................................... 51
2 Conclusion..................................................................... 52

參考文獻 53

                                

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