Optics: Design of Beamsplitter Ge on KBr substrate

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SUMMARY

The discussion focuses on the design of a beamsplitter using Germanium (Ge) coating on Potassium Bromide (KBr) substrate for Fourier Transform Infrared Spectroscopy (FTIR). The user intends to apply the Ge coating via physical vapor deposition and verify its quality with a calo tester. Key considerations include determining the appropriate thickness of the Ge layer and utilizing Fresnel's equations and the transfer matrix method for optimizing the beamsplitter's performance.

PREREQUISITES
  • Understanding of physical vapor deposition techniques
  • Familiarity with Fresnel's equations in optics
  • Knowledge of thin film optics and the transfer matrix method
  • Experience with calo testers for quality assurance
NEXT STEPS
  • Research the optimal thickness for Ge coatings on KBr substrates
  • Study the application of Fresnel's equations in beamsplitter design
  • Explore the transfer matrix method for thin film analysis
  • Investigate calibration techniques using calo testers
USEFUL FOR

Optical engineers, materials scientists, and researchers involved in FTIR spectroscopy and beamsplitter design will benefit from this discussion.

SupaVillain
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Hi there, I am making a beam splitter for an FTIR, but I do not know the anatomy of a beamsplitter of this type, does anybody have information on the design of these?

I plan to order KBr crystal windows and apply the Ge coating myself using physical vapor deposition and assuring quality with a calo tester. I just don't know how thick i need it and how i get it to actually split the HeNe laser
 
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