Femtosecond and nanosecond dual-laser optical emission spectroscopy of gas mixtures

Cheng Hsiang Lin, Zhi Liang, Jun Zhou, Hai Lung Tsai

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

A method employing an integrated femtosecond (fs) and nanosecond (ns) dual-laser system was developed to generate plasma with desired radical species from gas mixtures via a fs laser pulse and then to excite selected radical species to higher electronic states using a wavelength-tunable ns laser pulse. An optical spectrometer was used to measure the emission spectra and identify the transition from the excited electronic state to the ground state. The proposed technique has been demonstrated for an N2-CO2 mixture with various time delays between the two fs and ns pulses. The results have indicated that the population of selected radical species at the excited electronic state can be increased using the subsequent ns laser pulse, which also enhances the intensity of emission spectra allowing better identifications of the radical species. This technique holds a promise of detection and identification of signature plasma species, particularly for trace elements and long-distance standoff detections.

Original languageEnglish (US)
Pages (from-to)222-225
Number of pages4
JournalApplied Spectroscopy
Volume68
Issue number2
DOIs
StatePublished - Feb 1 2014

Fingerprint

Optical emission spectroscopy
optical emission spectroscopy
Electronic states
laser spectroscopy
Gas mixtures
gas mixtures
Lasers
Laser pulses
pulses
Plasmas
Laser tuning
emission spectra
electronics
Trace Elements
Electron transitions
Ultrashort pulses
Trace elements
lasers
Ground state
Spectrometers

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Spectroscopy

Cite this

Lin, Cheng Hsiang ; Liang, Zhi ; Zhou, Jun ; Tsai, Hai Lung. / Femtosecond and nanosecond dual-laser optical emission spectroscopy of gas mixtures. In: Applied Spectroscopy. 2014 ; Vol. 68, No. 2. pp. 222-225.
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Femtosecond and nanosecond dual-laser optical emission spectroscopy of gas mixtures. / Lin, Cheng Hsiang; Liang, Zhi; Zhou, Jun; Tsai, Hai Lung.

In: Applied Spectroscopy, Vol. 68, No. 2, 01.02.2014, p. 222-225.

Research output: Contribution to journalArticle

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