Experiment_8 - Experiment 8 Michelson Interferometer...

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Experiment 8 Michelson Interferometer Introduction This week’s experiment utilizes the Michelson interferometer. You are to measure the wavelength of the green mercury light, the wavelength of the sodium doublet, and the separation of the sodium doublet. You will use the wavelength of the Helium-Neon laser as a wavelength standard. The Michelson interferom- eter you will be using is of modular construction. There are two mirrors and a beam splitter mounted on magnetic bases. One mirror is movable. The beam splitter is the cube type; two 45 degree prisms bonded together. A few words about the operation of this interferometer are in order. The movable mirror is mounted on a carriage which in turn sits on top of rollers. Bolted to the carriage is a piezoelectric ceramic stack. This stack makes contact with a micrometer screw which is fixed to the table. There are two methods of moving the mirror. The coarse motion is accomplished with the micrometer screw. The fine motion is accomplished with the piezoelectric stack. Piezo- electric materials expand or contract when a voltage is applied. The stack is controlled with an external potentiometer. Very small motions are possible with the piezoelectric stack. 1 Alignment 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. You will use a reference laser to calibrate the interferometer. Your instructor will place the laser into the correct position. First we must prepare to make a measurement. Turn the potentiometer full counter-clockwise. (It should already be in this position; we are just making sure.) Next turn the potentiometer full clockwise. Observe the fringes as you turn the potentiometer. Remember, this is a ten-turn pot. Now turn the potentiometer back to full counter-clockwise. Run the in-
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This note was uploaded on 12/09/2011 for the course PHYS 450 taught by Professor Staff during the Fall '08 term at Purdue University-West Lafayette.

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Experiment_8 - Experiment 8 Michelson Interferometer...

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