Elastooptic constant

Changes in the refractive index of the glass, which result from the generated stress, are determined by the elastooptic constants [42] ... 

On the basis of equation (22) and elastooptic constants (21) it can be calculated how the stresses at the glass surface change as a result of the heating processes. A graph of this relationship is shown in Fig.l 8 b. There can be seen that after a heating time of about 50 h, the value of stresses at the glass surface decreases to half its value after the diffusion process. 

The scattering of light by acoustic waves in single and multidomain crystals of /3 -Gd2(Mo04)3 has been studied by Esayan et al. (1974). They determined all 12 independent photoelastic constants and found the constant P66 of opposite sign relative to pii, P22, P12 and p2i. Thus both electrooptic and elastooptic constants associated with the shear deformation about [001] appear to be negative. 

Tables 4.4-3-4.4-21 are arranged according to piezoelectric classes in order of decreasing symmetry (see Table 4.4-2), and alphabetically within each class. They contain a number of columns placed on two pages, even and odd. The following properties are presented for each dielectric material density q, Mohs hardness, thermal conductivity k, static dielectric constant Sij, dissipation factor tanS at various temperatures and frequencies, elastic stiffness Cmn, elastic compliance s n (for isotropic and cubic materials only), piezoelectric strain tensor di , elastooptic tensor electrooptic coefficients r k (the lat-...

Static dielectric constant Dissipation factor Elastic stifbiess tensor Elastic compliance tensor Elastooptic 1 tensor ... 

Broussoux and Mkheron [17] reported electrooptic and elastooptic effects in stretched PVDF. The linear EO coefficients in PVDF were measured at room temperature and constant stress at the He-Ne laser wavelength. The refractive indices n, 1.444. A = 1.436, and n, 1.42S and electrooptk coefficients rn = 0.10 pmA, 0.21 pm/V were OKasured. The secondary electrooptic effect estimated for the longitudinal configuration was ZS% of the measured free electrooptic coefficient. The quadratic electrooptic coefficients at constant strain and stress were gu 0.02 m /C and ga s 0.01 m /C. ... 

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