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Optical and physical parameters of Plexiglas 55 and Lexan

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Abstract

The following parameters have been obtained for Plexiglas 55 and Lexan: refractive index n at 486.1 nm, 589.3 nm, and 656.3 nm, the thermooptic constant dn/dT at 632.8 nm, the linear thermal expansion coefficient; the photoelastic constants q11, q12, p11, and p12; and the elastic moduli c11, c12, s11, and s12. The experimental value for the density derivative of refractive index ρ(dn/)T deviates by only a small amount from the value calculated from the Lorentz-Lorenz equation. This is the expected result for molecular solids. The density variation with temperature is the dominant contribution to dn/dT.

© 1979 Optical Society of America

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