2.8 Wave Propagation in Anisotropic Media - MIT …
https://ocw.mit.edu/courses/6-974-fundamentals-of-photonics-quantum-electronics-spring-2006/e1e047e358e9bf49e9af7dfb43b73c80_wv_prop_anis_med.pdf
WEBHere we want to consider the case of an uniaxial crystal, where εxx = εyy = ε1 6= εzz = ε3. (2.406) The refractive indices corresponding to these susceptibilities are called ordi-nary and extraordinary indices n1 = no 6= n3 = ne. (2.407) Further, there is a distinction between positive, ne >no,and negative, ne < no,uniaxial crystals. The ...
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