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Unformatted text preview: Experiment 9 Fabry-Perot Interferometer Introduction This weeks lab is an experiment with the Fabry-Perot interferometer. You are to measure the wavelength of the green mercury line, the wavelength of the sodium doublet, and the separation of the sodium doublet. The Helium-Neon laser will be used as a wavelength standard. You will be using a modular Fabry-Perot interferometer. Except for the opti- cal arrangement, this uses the same modular parts as the Michelson experiment. In particular, the method of translating the carriage is the same. 1 Laser Fringes Procedure The interferometer must be aligned before you start. This is a non-trivial task. Your instructor will align the interferometer before you start. The overall procedure is outlined at the end of this paper. Do not attempt to realign the interferometer during lab. If you have any trouble, ask your instructor for help. The slightest disturbance of the instrument will make it impossible to see the fringes. Be careful not to bump the mirrors. First, the laser is used to calibrate the interferometer. Your instructor will place the laser in the correct position. Turn the potentiometer full counter-clockwise. (It should already be in this position but we are just making sure.) Next turn the potentiome- ter full clockwise. Observe the fringes as you turn the potentiometer....
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- Fall '08