Image: Birifrangence k-surface
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Description: In a birefringent crystal, at each frequency and direction correspond two possible values of the wavenumber, as the surface of allowed k-vectors has two sheets. For some special directions these two values are degenerate (optic axes).
Title: Birifrangence k-surface
Credit: https://twitter.com/j_bertolotti/status/1194199575562739712
Author: Jacopo Bertolotti
Permission: https://twitter.com/j_bertolotti/status/1030470604418428929
Usage Terms: Creative Commons Zero, Public Domain Dedication
License: CC0
License Link: http://creativecommons.org/publicdomain/zero/1.0/deed.en
Attribution Required?: No
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