Abstract

The transfer of excitation energy between the molecules of compounds is an
effective and important phenomenon in extensive application, and particularly in
the development of dye laser. The energy transfer between two lasing
compound, Coumarin 522 (donor) and Rhodamine 101 (acceptor) has been
investigated in order to achieve the operational conditions for efficient lasing at
desired wavelengths. Absorption spectrum of each compound of different
concentrations (10-4-10-6) molarty with ethanol at room temperature were measured
prior to and after mixing. Wide absorption spectral bandwidth was observed in the
mixture that increasing concentration shifts the absorption spectrum peak towards
longer wavelengths.The maximum absorption bandwidths in the mixture ranging
between (340-650)nm were obtained at concentrations (10-4) molarty for each
compound with a mixing ratio (1:1) depending on the donor concentrations. This
range provides a wide – scale pumping source for lasers