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In a previous paper we described details of the construction of stabilized 670-nm diode lasers for use in undergraduate physics laboratories. We report here a series of experiments that can be performed using the 670-nm diode laser, a homemade scanning Fabry-Perot cavity, a helium-neon laser, a simple photodiode, and a few pieces of electronics hardware. The experiments include: 1) an introduction to the scanning confocal Fabry-Perot cavity, and to its use as an optical spectrum analyzer; 2)doi:10.1119/1.18330 fatcat:na4ohzzijnch5pa2m2q4eyu2ne