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countable and uncountable, plural birefringences
(physics) The splitting of a ray of light into two parallel rays of perpendicular polarization by passage through an optically anisotropic medium; the property of a material that light passing through it is so split. quotations examples
In figure 6, the birefringence, δ, for 2H, 4H, 6H, and 15R is plotted as a function of wavelength.
1972, J. Anthony Powell, Refractive Index and Birefringence of 2H Silicon Carbide, page 13
This means that, in contrast to the relaxation after steady shear flow, one has actually to expect that there will be a significant difference in the speeds of relaxation of birefringence and recoverable shear like the difference suggested by the courses of curves I and II of Fig.4.1.
1983, Hermann Janeschitz-Kriegl, Polymer Melt Rheology and Flow Birefringence, Springer, page 424
In this paper, two-dimensional thermal and mechanical stress-induced birefringence measurements in laser-diode-pumped solid-state laser materials using the new polarimeter are described.
1994, Technology Reports of the Osaka University, Volumes 44-45, Osaka University, page 254
Heat accumulation in borosilicate glass has [been] shown to produce lower birefringence due to radial stress regions as opposed to the more asymmetric stress produced in fused silica ; however, these features remain unexplored in most glasses.
2012, Luís A. Fernandes, Birefringence and Bragg grating control in femtosecond laser written optical circuits, Departamento de Física e Astronomia da Universidade do Porto, page 112