Fabryperot_notes - There is another way to find d and R...

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Modern Physics Lab: Fabry-Perot Interferometer: Supplementary Notes Rex Tayloe Department of Physics, Indiana University 2/20/03 Last Revised: 10/9/03 Goals : Understand how a Fabry-Perot Interferometer works and use it to observe the hyperfine splitting of spectral lines. Tasks: Tasks 1-6 are done with the laser, goniometer, and PMT. For tasks 7-11, move the etalon to the adjacent setup that has the eyepiece and Hg lamp. Task 1: Derive the equations. Task 2: Use neutral density filters to determine the PMT voltage and verify that the PMT response is linear. The transmission through the filters is given by T=10 -D . Where D is the optical density. Task 3: Determine d and R of the etalon as explained in the writeup. The relative angles of the etalon can be read from the goniometer. Find the relative angle that corresponds to θ =0 ° by finding the central bright bright spot at θ =0 °. See Task 6.
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Unformatted text preview: There is another way to find d and R with only relative angles. See if you can figure out how to do this. Tasks 4-5: Derive and understand equations 1-3. Task 6: Measure the transmitted intensity as explained. If you use care, you can read the angle from the goniometer without the laser and mirror. Task 7-8: (Duplicated in writeup). Ask your instructor for the focal length. Task 9: Determine the separation between the main and satelite rings (the eyepiece mechanism is attached to a micrometer) and corresponding wavelength differences. Task 10: Derive equation 6. Task 11: Describe your observations of the hyperfine lines of Hg (from Task 9) with help from the information in section 6 of the writeup and from p241ff of Preston and Dietz. Misc. Hints:- This experiment is much easier with rooms lights off.- A reasonable PMT HV setting is ~400V....
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This document was uploaded on 01/20/2012.

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