Dispersion-equation coefficients for the refractive index and birefringence of calcite and quartz crystals

The refractive index, birefringence and their dispersions are analyzed accu rately in a physically meaningful model of a dispersion equation having onl y five coefficients for the calcite and quartz crystals. This dispersion eq uation is based on the average electronic absorption gap in the UV region a nd the effective lattice resonance absorption gap in the IR region. The fiv e coefficients of the dispersion equation are different for each fundamenta l parameters. The dispersion equation for the birefringence leads to repres ent a standardized equation describing the birefringence of all optical mat erials. (C) 1999 Elsevier Science B.V. All rights reserved.