Ultrafast laser-collision- induced fluorescence in atmospheric pressure plasma

被引：7

作者：

Barnat, E. V. ^{[1
]}

Fierro, A. ^{[1
]}

机构：

[1] Sandia Natl Labs, POB 5800, Albuquerque, NM 87185 USA

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2017年 / 50卷 / 14期

关键词：

atmospheric pressure plasma; diagnostics; laser-collision-induced fluorescence; ultrafast laser; laser-induced fluorescence; helium; SUBNANOSECOND SPECTRAL DIAGNOSTICS; STREAMER DISCHARGES; IONIZATION; COMBUSTION; HELIUM; AIR;

D O I：

10.1088/1361-6463/aa5f1e

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The implementation and demonstration of laser-collision-induced fluorescence (LCIF) generated in atmospheric pressure helium environments is presented in this communication. As collision times are observed to be fast (similar to 10 ns), ultrashort pulse laser excitation (<100 fs) of the 2(3)S to 3(3)P (388.9 nm) is utilized to initiate the LCIF process. Both neutral-induced and electron-induced components of the LCIF are observed in the helium afterglow plasma as the reduced electric field (E/N) is tuned from <0.1 Td to over 5 Td. Under the discharge conditions presented in this study (640 Torr He), the lower limit of electron density detection is similar to 10(12) e cm(-3). The spatial profiles of the 2(3)S helium metastable and electrons are presented as functions of E/N to demonstrate the spatial resolving capabilities of the LCIF method.

引用

页数：7

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