Investigation of transient phenomena in microplasmas by absorption spectroscopy and by laser-assisted "pump-probe"-experiments

通过吸收光谱和激光辅助“泵浦探针”实验研究微等离子体中的瞬态现象

• 批准号: 109363135
• 负责人: Dr. Marc Böke
• 金额: --
• 依托单位: Institut für Experimentalphysik II: Anwendungsorientierte Plasmaphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2009
• 资助国家: 德国
• 起止时间: 2008-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/109363135?language=en
• 关键词: Investigation; transient; phenomena; microplasmas; absorption

Metastable Hem and Arm species have turned out to be important for the understanding of energy transport in microplasmas as they constitute an important reservoir of potential energy. They seem to influence strongly the dynamics and the stability of the discharges i.e. they play an important role in transient phenomena. These are in particular the evolution of the discharge in the ignition phase, the -γ-transition and the transition into the arcing mode. Absorption spectroscopy is a powerful tool to gain spatially and time resolved information on metastables and other reactive species. The interaction with short intense laser pulses can trigger ignition and the transition into other transient states of the plasma. Laser assisted \pump-probe" experiments involving simultaneously generated super continuum radiation and/or fast optical emission spectroscopy may yield highly time resolved and spatially well defined information on the transient phenomena. The project part A2 consists of two parts: 1) Absorption spectroscopy at various microplasma configurations used in the Research Unit using tunable diode lasers and broad band absorption spectroscopy, and 2) laser assisted " pump-probe" ignition and plasma-surface interaction studies using the custom designed FemtoProbe system. Both project parts are well defined but very closely interlinked. They both draw on the successful preparatory work in the first funding phase. Both project parts have intimate connection to other project parts of the Research Unit.

亚稳态的Hem和ARM物种对于理解微等离子体中的能量传输是很重要的，因为它们构成了一个重要的势能储存库。它们似乎对放电的动力学和稳定性有很大的影响，即它们在暂态现象中起着重要作用。特别是点火阶段的放电演化、-γ转变和向引弧模式的转变。吸收光谱是获得有关亚稳态和其他活性物种的空间和时间分辨信息的有力工具。与短强度激光脉冲的相互作用可以触发点火，并转变为等离子体的其他瞬变状态。激光辅助泵浦探测“实验涉及同时产生的超连续辐射和/或快速光发射光谱，可能产生关于瞬变现象的高度时间分辨和空间清晰的信息。项目A2部分由两部分组成：1)使用可调谐二极管激光器和宽带吸收光谱技术在研究单元中使用的各种微等离子体结构的吸收光谱，以及2)使用定制设计的FemtoProbe系统进行激光辅助“泵浦-探测”点火和等离子体-表面相互作用研究。这两个项目部分都定义得很好，但相互联系非常紧密。它们都借鉴了第一个筹资阶段的成功筹备工作。这两个项目部分都与研究股的其他项目部分有密切联系。

项目成果

Space resolved density measurements of argon and helium metastable atoms in radio-frequency generated He-Ar micro-plasmas

• DOI: 10.1140/epjd/e2010-00166-8
• 发表时间: 2010-06
• 期刊: The European Physical Journal D
• 作者: B. Niermann;M. Böke;N. Sadeghi;J. Winter

Impurity intrusion in radio-frequency micro-plasma jets operated in ambient air

• DOI: 10.1088/0022-3727/44/32/325201
• 发表时间: 2011-05
• 期刊: Journal of Physics D: Applied Physics
• 作者: B. Niermann;A. Kanitz;M. Böke;J. Winter

Time-resolved characterization of a filamentary argon discharge at atmospheric pressure in a capillary using emission and absorption spectroscopy

• DOI: 10.1088/0022-3727/46/46/464009
• 发表时间: 2013-11
• 期刊: Journal of Physics D: Applied Physics
• 作者: S. Schröter;Ramasamy Pothiraja;P. Awakowicz;N. Bibinov;M. Böke;B. Niermann;J. Winter

Application of a mode-locked fiber laser for highly time resolved broadband absorption spectroscopy and laser-assisted breakdown on micro-plasmas

锁模光纤激光器在高度时间分辨宽带吸收光谱和微等离子体激光辅助击穿中的应用

• DOI: 10.1088/0022-3727/45/24/245202
• 发表时间: 2012
• 期刊: Journal of Physics D: Applied Physics
• 作者: B. Niermann;I.L. Budunoglu;K. Gurel;M. Böke;F.O. Ilday;J. Winter
• 通讯作者: J. Winter

Two dimensional spatial Argon metastable dynamics in HiPIMS discharges

• DOI: 10.1088/0022-3727/49/12/125203
• 发表时间: 2016-02
• 期刊: Journal of Physics D: Applied Physics
• 作者: A. Kanitz;A. Hecimovic;M. Böke;J. Winter