Michelson interferometer dimensions

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SUMMARY

The discussion focuses on designing a Michelson interferometer for measuring small distance movements using a 635 nm wavelength laser diode with 3 mW power. The user seeks guidance on determining the dimensions of the interferometer components, specifically the distances from the laser source to the beam splitter, from the beam splitter to the fixed mirror, and from the beam splitter to the detector. The moving mirror is to be positioned 35 mm from the beam splitter, and the fixed mirror is also suggested to be placed at 35 mm to ensure accurate fringe measurement based on the equation d = mλ/2.

PREREQUISITES
  • Understanding of Michelson interferometer principles
  • Familiarity with laser diode specifications and applications
  • Knowledge of optical path length and interference patterns
  • Basic skills in optical component alignment
NEXT STEPS
  • Research the design parameters for Michelson interferometers
  • Learn about optical alignment techniques for precision measurements
  • Explore the impact of laser wavelength on interference fringe visibility
  • Investigate the effects of mirror dimensions on optical performance
USEFUL FOR

Optical engineers, physicists, and researchers involved in precision measurement and interferometry applications will benefit from this discussion.

malak
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hi
i want to design michelson interferometer device for measuring small distance movement
i am using laser diode with a wavelength 635 nm and power 3 mw
can anyone tell me how can i decide the dimensions (from source to beam splitter , for beam splitter to fixed mirror , from beam splitter to detector )
knowing that the moving mirror should be placed 35 mm from beam splitter (the tested object position )
also how can i choose the fixed mirror dimensions ?
regards
 
Last edited by a moderator:
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the equation used in michelson interferometer is

d = mλ/2

so then I will put my fixed mirror also at 35 mm, if there are a displacement in the object there will be a differences in the amount of fringes
 

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