Erin Shin Cousens - Lab 6 Report - PHYS 1493 Experiment 6 Interferometer Erin Shin Cousens esc2186 Shin Cousens 1 Introduction 1.1 Experimental

Erin Shin Cousens - Lab 6 Report - PHYS 1493 Experiment 6...

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PHYS 1493 Experiment 6 Interferometer Erin Shin Cousens esc2186 Shin Cousens 11/15/2016
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1) Introduction : 1.1) Experimental Objectives : The purpose of this experiment was to measure the wavelength of a laser beam and to determine the indices of refraction for air and glass using a Michelson and Fabry- Perot Interferometer. 1.2) Michelson Interferometer : An interferometer is an apparatus that splits a beam of light and recombines those beams onto a viewing screen using mirrors. A Michelson interferometer consists of a laser, a focusing lens, a beam splitter, a movable mirror (M 1 ), a fixed mirror (M 2 ), and a viewing screen, as shown by the diagram below: Half of the light from the laser is transmitted through the beam splitter to M 1 , while the other half is reflected to M 2 . Similarly, half of the reflected light from M 2 is transmitted through the beam splitter to the viewing screen, and half of the light from M 1 is reflected by the beam splitter to the viewing screen. Both of these light rays came from the same source (laser), thus if they arrive in phase (either by travelling the same distance or at a difference of mλ, where m is an integer and λ is the waveleng th of light), constructive interference can be observed on the viewing screen. If the two light beams arrive at the viewing screen 180˚ out of phase, destructive interference can be observed on the viewing screen. It s worth noting that the interference pattern generated by an interferometer looks similar to that shown below:
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