2.4 Laser Interferometer || Construction and Working of Laser Interferometer

Laser interferometer can be used for measurements of small diameters as well as large displacements.
Working--
--Laser light first falls on the semi-reflector 'P', is partially reflected by 90°, and falls on the other reflector 'S'.
--A portion of the light passes through 'P' and strikes the corner cube. Light is turned through 180° by the corner cube and recombines at the semi reflector 'S'.
--If the difference between these two paths of light (PQRS − PS) is an odd number of half wavelengths, then interference will occur at S and the diode output will be at a minimum.
--On the other hand, if the path difference is an even number of half wavelengths, then the photodiodes will register maximum output.
--Each time, the moving slide is displaced by a quarter wavelength, the path difference (i.e., PQRS − PS) becomes half a wavelength and the output from the photodiode also changes from maximum to minimum or vice versa.
#laser #Interferometer #interferometry #laser_Interferometer
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