birefringenceˌbaɪ rɪˈfrɪn dʒəns
birefringence (n)
English Definitions:
double refraction, birefringence (noun)
splitting a ray into two parallel rays polarized perpendicularly
birefringence (Noun)
the splitting of a ray of light into two parallel rays of perpendicular polarization by passage through an optically anisotropic medium
Birefringence
Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. These optically anisotropic materials are said to be birefringent. The birefringence is often quantified by the maximum difference in refractive index within the material. Birefringence is also often used as a synonym for double refraction, the decomposition of a ray of light into two rays when it passes through a birefringent material. This effect was first described by the Danish scientist Rasmus Bartholin in 1669, who saw it in calcite. Crystals with anisotropic crystal structures are often birefringent, as well as plastics under mechanical stress.
Birefringence
Birefringence is the optical property of a material having a refractive index that depends on the polarization and propagation direction of light. These optically anisotropic materials are said to be birefringent (or birefractive). The birefringence is often quantified as the maximum difference between refractive indices exhibited by the material. Crystals with non-cubic crystal structures are often birefringent, as are plastics under mechanical stress. Birefringence is responsible for the phenomenon of double refraction whereby a ray of light, when incident upon a birefringent material, is split by polarization into two rays taking slightly different paths. This effect was first described by Danish scientist Rasmus Bartholin in 1669, who observed it in calcite, a crystal having one of the strongest birefringences. In the 19th century Augustin-Jean Fresnel described the phenomenon in terms of polarization, understanding light as a wave with field components in transverse polarization (perpendicular to the direction of the wave vector). Parametric down-conversion is a phenomenon similar to birefringence arising in nonlinear crystals in the presence of an electromagnetic field.
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