General Aim of Laser Beam Experiment
To verify that the profile for a laser beam is Gaussian and determine its characteristics.
Laser Beam Divergence Experiment.. Method
Laser Source-Photodiode Method.
Laser Beam Experiment.. Learning Objectives
Define the profile of a laser beam.
Set up an experiment to study the laser beam divergence and profile.
Determine the laser beams’ diameter.
Prove that the laser does not obey the inverse square law.
Laser Beam Divergence Experiment.. Theoretical Background
Most low-intensity laser sources emit laser beam with gaussian distribution:
in the transverse direction. where ωz2 is the beam diameter at which the beam intensity falls to I0/e 2.
Also, due to the coherent property of laser, it shouldn’t obey the inverse square law obeyed by ordinary light.
Laser Beam Virtual Experiment | Principle of Work
By measuring the laser beam intensity using a photodiode sensor, as a function of the distance from the center of the beam in the transverse direction, we obtain the profile for the laser beam which should be Gaussian. Hence, the beam diameter could be found. plotting the beam profile at different distances from the source could be done and determine the beam divergence which proves that the laser does not obey the inverse square law.
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