強耦合微粒電漿中脈衝雷射引發電漿微泡

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姓名

曲宏宇(Hong-Yu Chu) 查詢紙本館藏

畢業系所

物理學系

論文名稱

強耦合微粒電漿中脈衝雷射引發電漿微泡
(Pulsed laser induced micro bubbles in strongly coupled Coulomb liquids)

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摘要(中)

非線性引發的現象已經在不同的領域裡有了相當多的研究，在這篇的論文中以微粒電漿為背景及脈衝雷射為工具，來產生電漿微泡。
進而以電漿微粒做微觀測其電漿微泡的動力行為，首次以實驗中觀測到電漿孤立子的出現及運動行為，而在延續調控實驗參數使電漿中非線性的特性產生波動現象。

摘要(英)

Nonlinearity-induced instability are observed in many different branches of physics. Also, strongly coupled coulomb clusters are contained richly nonlinear phenomena, which are well developed in past few years in our lab. Dust particles are negatively charged inside plasma, since electrons have higher mobility than ions in plasma. Therefore by introducing plume, which is generated by focused pulse laser into dusty plasma, we present a plasma bubble in the plasma system, which has long life time as cavitation bubble in water. To the extent of the system condition, instability waves are also observed.

關鍵字(中)

★ 電漿
★ 孤立子
★ 脈衝雷射

關鍵字(英)

★ pulsed laser
★ soliton
★ dusty wave
★ dusty plasma

論文目次

Contents
1 Introduction . . . . . . . . . . . . . . . . . . 1
2 Background . . . . . . . . . . . . . . . . . . 5
2.1 Dusty plasma system . . . . . . . . . . . . . . . . 5
2.1.1 Dusty plasma structure . . . . . . . . . . . 6
2.1.2 Dusty plasma crystals and liquids . . . . . 8
2.1.3 Wave in plasma . . . . . . . . . . . . . . . 9
2.2 Bubble formation . . . . . . . . . . . . . . . . . . 10
2.2.1 Bubble generated by pulsed laser in water . . . . .11
2.2.2 Bubble generated in plasma by simulation . . . . .12
2.3 Laser - matter interaction . . . . . . . . . . . . . 14
2.3.1 Laser - solid interaction . . . . . . . . . . 14
2.3.2 Laser - liquid interaction . . . . . . . . . . 17
2.3.3 Laser - gas interaction . . . . . . . . . . . 17
3 Experiment . . . . . . . . . . . . . . . . . . 19
3.1 Experimental setup . . . . . . . . . . . . . . . . . 19
3.1.1 Plasma bubble formation setup . . . . . . 19
3.1.2 Operation condition . . . . . . . . . . . . 21
3.2 Data measurement . . . . . . . . . . . . . . . . . 23
3.2.1 Bottom voltage measurement . . . . . . . 23
3.2.2 Measurement for plasma bubble formation 24
4 Result and Discussion . . . . . . . . . . . . . . . . . . 25
4.1 Pulsed laser interaction with bottom plate . . . . 25
4.1.1 Space charge distribution after ablation . . 25
4.1.2 Pulsed laser - bottom interaction . . . . . 27
4.1.3 Summary . . . . . . . . . . . . . . . . . . 29
4.2 Pulsed laser interaction with dusty plasma . . . . 30
4.2.1 Overdamped bubble . . . . . . . . . . . . 31
4.2.2 Traveling bubble . . . . . . . . . . . . . . 32
4.2.3 Bubble induced wave formation . . . . . . 39
4.2.4 Spontaneous waves . . . . . . . . . . . . . 40
4.2.5 Summary . . . . . . . . . . . . . . . . . . 42
5 Conclusion . . . . . . . . . . . . . . . . . . 48

參考文獻

Bibliography
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指導教授

伊林(Lin I)

審核日期

2002-7-1

推文