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If we go with the Lorentz oscillator model of susceptibility, it is obvious that high frequency resonance tails raise the refractive index of low frequency light. However, I recently came across a question in a paper that asks how IR absorption in glass could affect the refractive index in the visible region. I am clueless as to how there could be a connection between the two.

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    $\begingroup$ But wouldn't Kramers-Kronig applied to the newly introduced IR absorption also come with dispersive effect far detuned? $\endgroup$ – Georg E. Jul 27 at 3:30
  • $\begingroup$ Contribution from the KK integral will be minimal at frequencies larger than the resonance frequency while it would add a finite constant at lower frequencies. $\endgroup$ – Arnab Barman Ray Jul 28 at 4:28
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If you raise the temperature of the glass with IR and the index of refraction in the visible region is temperature dependent, this could be a connection.

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    $\begingroup$ Excellent point! $\endgroup$ – Arnab Barman Ray Jul 26 at 23:24

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