A Sagnac interferometer splits an incident beam of light into two components which travel in opposite directions of the same path. Consequently, each beam travels an equivalent distance. However, by rotating the entire apparatus at a sufficient speed, a noticeable change in the beams’ interference pattern is observed. This pattern results from one beam travelling against rotation and the other travelling with rotation, resulting in an increase or decrease in apparent path length, respectively. This is known as the Sagnac Effect. By using a traditional mirror-and-laser interferometer setup and a large turntable, we demonstrate the Sagnac Effect by showing that a given angular velocity results in a phase shift which matches what is predicted.
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January 2021
This content was originally published in
Journal of Undergraduate Reports in Physics
Research Article|
January 01 2021
Demonstrating the Sagnac Effect Using Tabletop Optics on a Rotary Platform
Jonathan Mock;
Jonathan Mock
a)
1
LeTourneau University
, 2100 S Mobberly Ave, Longview, TX 75602, USA
a)Corresponding Author: [email protected]
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Jared Medlin;
Jared Medlin
b)
1
LeTourneau University
, 2100 S Mobberly Ave, Longview, TX 75602, USA
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Matthew Richards;
Matthew Richards
c)
1
LeTourneau University
, 2100 S Mobberly Ave, Longview, TX 75602, USA
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Edward Hamilton
Edward Hamilton
d)
1
LeTourneau University
, 2100 S Mobberly Ave, Longview, TX 75602, USA
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a)Corresponding Author: [email protected]
J. Undergrad. Rep. Phys. 31, 100007 (2021)
Citation
Jonathan Mock, Jared Medlin, Matthew Richards, Edward Hamilton; Demonstrating the Sagnac Effect Using Tabletop Optics on a Rotary Platform. J. Undergrad. Rep. Phys. 1 January 2021; 31 (1): 100007. https://doi.org/10.1063/10.0006346
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