What would happen if the light was not propagated linearly?
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- =====>> Light propagation in anisotropic media (most of them single crystals) is characterized by a material response to the incident light which is dependent on the direction of the wave electric field. Natural anisotropic crystals such as Iceland spar (CaCO3) and quartz (SiO2) have been used in optics laboratories for a long time. On the other hand, modern optical devices based on anisotropic materials are prepared from crystals grown in the laboratory under strict conditions (high purity, homogeneity and crystal perfection are required). Typical examples are NH4H2PO4 (ADP), commonly employed in second harmonic generation, and LiNbO3, from which many optical and electrooptical waveguide devices are currently being produced. Optical anisotropy can also be induced in an otherwise isotropic medium by external agents such as stress, magnetic or electric fields, and this gives rise respectively to the subjects of piezo- and acoustooptics, magnetooptics and electrooptics. If the medium is anisotropic before the external agent is applied, it will somehow modify the medium's anisotropy.
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