Experimental investigations on the temperature dependence of fluorescence and lasing characteristics of cw circulating organic dye lasers, excited with the multimode output of an Argon laser, were carried out for Rhodamine B, Rhodamine 6G, and Rhodamine 110 laser solutions in ethylene glycol. Significant improvements in the performance of Rhodamine B were observed as the solvent temperature was reduced below room temperature. These included significant reduction in the threshold pump requirements and a considerable increase in the attainable output power. This is in contrast to the results obtained for Rhodamine 6G and Rhodamine 110. Analysis of the results permit classification of dye lasers into three categories in so far as effects of cooling are concerned.
The effect of cooling the laser medium on the lasing characteristics of an organic cw dye laser, Rhodamine
B in ethylene glycol, pumped by an Argon laser was examined. Significant improvements in the
performance of this dye laser were achieved as the solvent temperature was reduced below room
temperature, namely: a significant reduction in the threshold power requirements and a considerable
increase in the attainable output power. The results obtained may be understood in terms of increased
quantum yield of the RhB dye as the temperature is reduced. This effect overrides possible negative
effects that are normally expected due to intermolecular relaxation processes and which are normally
observed for other dye lasers which already have high quantum yields at room temperature.
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