Putting together a research-grade laser refractometer in a teaching laboratory

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Abstract
The fixed angle of incidence method was developed in Trondheim as an alternative to the classical minimum deviation method [Am. J. Phys. 46, 1009 (1978)]. Modifications to the original apparatus, which has since been duplicated elsewhere, are made, and greater accuracy is achieved by (i) replacing the conventional light source with a laser and (ii) measuring two lengths instead of the deviation angle. Using a tunable dye laser, we have been able to reproduce the dispersion curve of water in the range 366–644 nm with a modicum of effort and equipment.

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