circular birefringence

https://doi.org/10.1351/goldbook.08231
Difference between the refractive indices of an optically active medium for left, \(n^{\rm{L}}\), and right, \(n^{\rm{R}}\), circularly polarized radiation (\(n^{\rm{L}}-n^{\rm{R}}\)).
Notes:
  1. "Circular birefringence" is also used to describe the phenomenon of having different refractive indices for left and right circularly polarized radiation.
  2. Like the refractive indices (\(n^{\rm{L}}\), \(n^{\rm{R}}\)), circular birefringence changes with wavenumber.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 653 [Terms] [Paper]