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Measurement of two-photon absorption cross-section in organic molecular salt with linear and circular polarized radiation |
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| Authors: | AK?Dharmadhikari AS?Sandhu JA?Dharmadhikari A?Mishra |
| Institution: | (1) Tata Institute of Fundamental Research, 1, Homi Bhabha Road, Mumbai, 400005, India;(2) Department of Chemistry and Chemical Engineering,, Polytechnic University, 6 Metrotech Center, Brooklyn, NY 11201, USA |
| 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  2 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 upconversion is 7%. PACS 42.65.-k; 42.70.Jk |
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