Fragmentation and emission of POPOP and coumarin dye vapor in an ultraviolet-preionized, transverse discharge

R. W. Herrick, R. D. Fraser, J. G. Eden

Research output: Contribution to journalArticlepeer-review

Abstract

Intense, streamer-free discharges have been produced in POPOP (1,4-di[2-(5-phenyloxazolyl)]- benzene), α-NPO (2-(α-naphthyl)-5- phenyl-oxazole), PBBO (2-(4-biphenylyl)-6- phenylbenzoxazol-1,3), and coumarin dye vapors buffered in He or rare gas/N2 mixtures. The transverse discharge has an equivalent series inductance of ∼85 nH, a current rise time of ∼50 ns, a pulse width (FWHM) of ∼140 ns, and active lengths up to 50 cm. For specific power loadings of rare gas/POPOP vapor mixtures ranging from 2 to ∼11 MW cm-3, the wavelength-integrated fluorescence falls to 50% of its initial value after 150-200 shots (at ∼620 K) and emission bands of CN and C2 appear. Under comparable conditions, the fluorescence efficiency of α-NPO is only 40% of that for POPOP vapor. The coumarin dyes are considerably less stable than POPOP and strong fluorescence on the Swan bands of C2 is observed after only a few shots. Net optical loss is measured when Ne/N2/POPOP vapor discharges are probed with a dye laser at ∼400 nm.

Original languageEnglish (US)
Pages (from-to)1293-1298
Number of pages6
JournalJournal of Applied Physics
Volume75
Issue number3
DOIs
StatePublished - 1994

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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