Solvent effects on the gain of rhodamine 6G |
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| Authors: | T Govindaunny B M Sivaram |
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| Institution: | (1) School of Physical Sciences, University of St. Andrews, North Haugh, KY 16933 St. Andrews, Scotland UK;(2) Department of Physics, College of Engineering, Perarignar Anna University of Technology, 600025 Madras, India |
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| Abstract: | The effect of solvents on the gain and the peaks of gain spectra is investigated for rhodamine 6G (R6G) under nitrogen laser
pumping. The non-specific solute-solvent interaction for R6G is found to be mainly dispersive. Additional shifts produced
for R6G in certain solvents are explained as due to hydrogen bonding. The gain characteristics are interpreted on the basis
of the position and overlap of absorption and fluorescence spectra, the quantum yield, the absorption at the pumping wavelength
and the refractive index of the solvent. For the solvents studied it is found that R6G has high gain in solvents with low
refractive index and high polarity. Amongst the solvents studied the alcohols displayed the highest gain with methanol being
the most suitable solvent. The lowest gain amongst the alcohols was with capryllic alcohol which gave a gain that was 69%
of that obtained with methanol. Amongst all the solvents studied the lowest gain was with chloroform, being only 34% of the
gain in methanol. |
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| Keywords: | 42 60 78 30 78 60 |
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