Abstract
Abstract We investigate a micro-fluidic dye laser, which can be integrated with polymer-based lab-on-a-chip microsystems without further processing steps. A simple rate-equation model is used to predict the lasing threshold. The laser device is characterised using the laser dye Rhodamine 6G dissolved in ethanol, and the influence of dye concentration on the lasing wavelength and threshold is investigated. The experiments confirm the predictions of the rate-equation model, that lasing can be achieved in the 10 μm long laser cavity with moderate concentrations of Rhodamine 6G in ethanol, starting from 5×10 −3 mol/l. We also find that the lasing wavelength can be tuned between 565 and 593 nm, controlled by the dye concentration.
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