Abstract
Students measure the visible absorption spectrum, the fluorescence spectrum, and the dye laser emission curve of one or more laser dyes. The absorption and fluorescence spectra are measured using commercial spectrometers and the laser emission curve is measured with a nitrogen-pumped dye laser and an energy meter. While this experiment produces qualitative results, its investigative flavor allows students to figure out for themselves the nature of the energy levels of the dye molecule and how the dye laser works. They must draw on a variety of spectroscopic and kinetic concepts to understand the meaning of the three spectra and the relationship between them. In addition, the students particularly enjoy maximizing the dye laser energy by making adjustments to the optics in the laser cavity. This allows them to tinker with the inner workings of an instrument in a more direct way than they have experienced before.
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