Abstract: The following document describes the procedure and results of a laboratory experiment performed as part of an undergraduate laboratory course in physics during the spring semester of 1996. The tunable wavelength properties of diode lasers are investigated and mode hopping is observed and explained. By measuring the size of the mode hops, the cavity length of the diode laser is then calculated. Finally, as an example of diode laser application, the laser is employed to observe the transition of Rubidium to its first excited state.

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