Microwave-enhanced laser-induced air plasma at atmospheric pressure

被引:17
|
作者
Ikeda, Yuji [1 ]
Soriano, Joey Kim [1 ]
机构
[1] i Lab Inc, 213 KIBC Bldg,5-5-2 Minatojima Minami, Kobe 6500047, Japan
关键词
INDUCED BREAKDOWN SPECTROSCOPY; SPARK-IGNITION; SHOCK-WAVES; INTENSITY; FEATURES;
D O I
10.1364/OE.470072
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
This paper investigated how microwaves affect the temperature of laser-generated air plasma. The air breakdown threshold was experimentally characterized by focusing the 1064 nm YAG laser on varied condensing lens focal lengths. Increase in focal lengths increases the focused spot diameter of the laser and decreases the laser fluence. Large spot diameter required large amount of laser fluence for breakdown. However, the plasma generated with small spot sizes found to absorb higher laser energy in compared to the plasma generated with large spot size condition. In terms of energy density, the experimental threshold breakdown was generated between 2.6 similar to 4.9 x 10(11) W/cm(2). The plasma formation was then observed under a high-speed camera. The area of intensity distribution increased with the input of microwaves owing to re-excitation and microwave absorption. This led to emission intensity measurements of the elusive stable electronically excited molecular nitrogen (N2 2nd positive system) and hydroxyl radical (OH). Without the input of microwave, these molecular and radical emissions were not observed. The OH and N2 2nd positive system emission intensities were then used to measure the rovibrational temperature using the synthetic spectrum method by SPECAIR. The rotational and vibrational temperatures were not found to be equal indicating non-equilibrium plasma. The nonequilibrium and nonthermal plasma was observed from after the initial laser air breakdown using the 2.6 x 10(11) W/cm(2), 1.0 kW microwave power, and 1.0 ms microwave pulse width. The microwaves were not found to affect the temporal changes in the rotational temperatures, demonstrating that the intensity enhancements and plasma sustainment were caused by re-excitation and not by microwave absorption.
引用
收藏
页码:33756 / 33766
页数:11
相关论文
共 50 条
  • [1] Analysis of the characteristics of microwave-enhanced laser-induced atmospheric air plasma and ablation plasma for Al target
    Ikeda, Yuji
    Soriano, Joey Kim
    TALANTA OPEN, 2023, 7
  • [2] Ignition characteristics of methane/air premixed mixture by microwave-enhanced laser-induced breakdown plasma
    Nishiyama, Atsushi
    Moon, Ahsa
    Ikeda, Yuji
    Hayashi, Jun
    Akamatsu, Fumiteru
    OPTICS EXPRESS, 2013, 21 (22): : A1094 - A1101
  • [3] Excitation Mechanism in Laser-Induced Plasma at Atmospheric Air Pressure
    Manalu, Jojor Lamsihar
    Kurniawan, Koo Hendrik
    Lie, Tjung Jie
    JOURNAL OF MATHEMATICAL AND FUNDAMENTAL SCIENCES, 2005, 37 (01) : 1 - 12
  • [4] Microwave-enhanced laser-induced breakdown spectroscopy of Zirconium metal
    Ikeda, Yuji
    Soriano, Joey Kim
    Wakaida, Ikuo
    TALANTA OPEN, 2023, 7
  • [5] Plasma ion emission enhancements of Zr using microwave-enhanced laser-induced breakdown spectroscopy
    Ikeda, Yuji
    Soriano, Joey Kim
    Akaoka, Katsuaki
    Wakaida, Ikuo
    SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2023, 203
  • [6] Spatially and temporally resolved plasma formation on alumina target in microwave-enhanced laser-induced breakdown spectroscopy
    Ikeda, Yuji
    Soriano, Joey Kim
    Kawahara, Nobuyuki
    Wakaida, Ikuo
    SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, 2022, 197
  • [7] Enhanced laser-induced plasma channels in air
    左言磊
    魏晓峰
    周凯南
    曾小明
    粟敬钦
    焦志宏
    谢娜
    吴朝辉
    Chinese Physics B, 2016, 25 (03) : 260 - 265
  • [8] Enhanced laser-induced plasma channels in air
    Zuo, Yanlei
    Wei, Xiaofeng
    Zhou, Kainan
    Zeng, Xiaoming
    Su, Jingqin
    Jiao, Zhihong
    Xie, Na
    Wu, Zhaohui
    CHINESE PHYSICS B, 2016, 25 (03)
  • [9] Interactions of microwaves with alumina surface in microwave-enhanced laser-induced breakdown spectroscopy
    Ikeda, Yuji
    Soriano, Joey Kim
    Wakaida, Ikuo
    OPTICS AND LASER TECHNOLOGY, 2023, 159
  • [10] Laser-induced current in air gap at atmospheric pressure
    Paris, P.
    Aints, M.
    Laan, M.
    Plank, T.
    JOURNAL OF PHYSICS D-APPLIED PHYSICS, 2005, 38 (21) : 3900 - 3906