PASCO Specialty & Mfg. OS-9256A User Manual download pdf (Page 24)

Precision Interferometer 012-07137A

Experiment 1: Introduction to Interferometry

Teacher's Guide

Reference to  Analysis (Part II)

1. The laser we used was unpolarized, and does not seem

to change polarization with time.

2. No, there was no change. This would support our

hypothesis that the laser used was unpolarized.

3. Cross-polarized beams do not interfere.

Answers to  Questions

1. The change in path length is twice the movement of the

mirror.

2. Measuring only many fringes, many times, decreases

the chance of random error affecting our results.

3. They were roughly the same. The Fabry-Perot

measurement could instill more confidence, because the

fringes are sharper and easier to count.

4. The difference is probably due to our uncertainty in

measurement.

5. Limiting factors are play in the system and uncertainty

in our micrometer position.

6. Losing count of fringes, and inexact positioning of the

fringes relative to our reference mark.

7. In order to interfere, the two light beams must have the

same polarization.

Part I  General

Dm wavelength

Michelson 1.60 x 10

5

640.0 x 10

9

1.60 x 10

5

640.0 x 10

9

1.60 x 10

5

640.0 x 10

9

Fabry-Perot 1.60 x 10

5

640.0 x 10

9

1.50 x 10

5

600.0 x 10

9

1.55 x 10

5

620.0 x 10

9

average: 630.0 x 10

9

±16.7 x 10

9

actual: 632.8 x 10

9

% diff. 0.44%

Part II  General

1. The pattern became somewhat dimmer, due to

absorbtion by the polarizer; but other than that, there

was no variation when we polarized the light coming

into the interferometer.

2. Adding a polarizer in front of the movable mirror had

little effect. The contrast of the interference pattern

reduced, and the pattern rotated when the polarizer was

rotated.

3. There was no pattern unless the two polarizers were in

the same orientation.

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PASCO Specialty & Mfg. OS-9256A User Manual Page 24

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