Physics Lab Equipment

LEOI-18 Fabry-Perot Interferometer

LEOI-18 Fabry-Perot Interferometer


  • Including Sodium Lamp with Power Supply

  • Smooth Mirror Movement

  • Compact Design

  • Two Micrometers with Observation Microscope


The Fabry-Perot interferometer (LEOI-18) is a standalone instrument that can be used to observe multiple-beam interference and measure the wavelength separation of Sodium D-lines. When equipped with other components, this setup can be used to conduct other experiments such as to observe the spectral shift of a Mercury isotope or the splitting of spectral lines of atoms in a magnetic field (the Zeeman effect). 

The instruction manual contains comprehensive materials including experimental configurations, principles and step-by-step instructions. Please click Experiment Contents to find more information about this apparatus.


Flatness of Reflective Mirrorsλ/20
Diameter of Reflective Mirrors30 mm
Reflectance of Mirrors95%
Effective Travel of Preset Micrometer~ 3 mm
Min Division Value of Preset Micrometer0.01 mm
Travel of Fine Adjustment of Movable Mirror1.25 mm
Resolution of Fine Adjustment0.0005 mm
Low-Pressure Sodium Lamp20 W

Part List

Fabry-Perot Interferometer1
Observation Lens (f=45 mm)1
Lens Holder with Post1 set
Mini Microscope1
Microscope Holder with Post1 set
Magnetic Base with Post Holder2 sets
Ground Glass Screen2
Pin-Hole Plate1
Low-Pressure Sodium Lamp with Power Supply1 set
User's Manual1


Interference Pattern of Sodium D-lines Observed with Mini-Microscope

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