The complex index of refraction of air

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SUMMARY

The discussion focuses on calculating the imaginary part of the index of refraction of air, which is significant only near the absorption frequencies of air molecules. These frequencies primarily occur in the infrared and ultraviolet ranges, making them irrelevant for visible light applications. The absorption coefficients for these ranges are available in tabulated form, allowing for precise calculations of the imaginary component of the index of refraction.

PREREQUISITES
  • Understanding of optical properties, specifically the index of refraction
  • Familiarity with absorption coefficients in different spectral ranges
  • Knowledge of infrared and ultraviolet light interactions with air
  • Basic mathematical skills for calculations involving tabulated data
NEXT STEPS
  • Research the absorption coefficients of air in infrared and ultraviolet ranges
  • Learn about the mathematical methods for calculating the imaginary part of the index of refraction
  • Explore the impact of molecular absorption on optical properties of gases
  • Investigate the applications of complex index of refraction in optical engineering
USEFUL FOR

Physicists, optical engineers, and researchers in atmospheric science who are interested in the optical properties of air and their implications in various spectral ranges.

makemasu
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Most textbooks list the real part of the index of refraction. How would I go about calculating the imaginary part of the index of refraction of air?
 
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The imaginary part is only non-zero very near to the absorption frequencies of the molecules. These absorptions occur in the infrared and ultraviolet, so you don't have to care about them in the visible. In the other ranges, the absorption coefficients are tabulated, so that you can calculate the imaginary part of the index of refraction if you like.
 

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