Measurement of two-photon absorption cross-section in organic molecular salt with linear and circular polarized radiation

A. K. Dharmadhikari, A. S. Sandhu, J. A. Dharmadhikari, A. Mishra, G. R. Kumar

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

We report on the investigation of two-photon absorption (TPA) in 4′-Diethylamino-N-Methyl-4-Stilbazolium Tosylate (DEST) with 40 picosecond, 1064 nm linear and circular polarization laser radiation. The TPA cross-section σ2 measured is larger for linear polarized radiation (948 GM) than that for the circular polarized radiation (840 GM). The large TPA cross-section of DEST facilitates highly directional and efficient TPA induced upconverted emission in the range of 590-640 nm even though the fluorescence efficiency of DEST is very low (∼ 0.5%). The net single pass efficiency of upcon-version is ∼ 7%.

Original languageEnglish (US)
Pages (from-to)235-238
Number of pages4
JournalApplied Physics B: Lasers and Optics
Volume79
Issue number2
DOIs
StatePublished - Jul 2004
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

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