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Principle

Two mirrors are assembled to form a Fabry-Perot interferometer. Using them, the multibeam interference ofa laser's light beam is investigated.On moving one of the mirrors, thechange in the intensity distributionof the interfeence pattern is studied. This is a qualitative experiment,to study the shape of different lasermodes and compare it with some photosgiven in this description.

Benefits

• study a fundamental component of lasers
• fascinating patterns emerge in a surprisingly symmetric setup
• learn about a widely used type of interferometer

Tasks

1. Construction of a Fabry-Perot interferometer using separate optical components.
2. The interferometeris used to observe different resonator modes within the interferometer.

What you can learn about

• Interference
• Wavelength
• Diffraction index
• Speed of light
• Phase
• Virtual light source
• Two-beam interferometer