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Date: 25-3-2016
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Dye lasers
Many organic dyes can exhibit a pronounced luminescence which covers a large range of wave-lengths in the visible range of the spectrum. A dye molecule which is quite often used for lasers is Rhodamine 6G. Its molecular structure is shown in fig. 1.1. The optical transitions are caused by electrons. We have to distinguish between two kinds of excitations. In one case the spin of the electron in the excited level is opposite to that of the remaining