Normalized electro-optic coefficients

Debye. In Fig. 7, graphs of normalized electro-optic coefficients versus chromo-phore number density are shown for the electrostatic energies of Fig. 6. Clearly, maxima in the curves of the electro-optic coefficient versus chromophore loading are predicted by Eq. 21 and the maxima are predicted to shift to lower loading with increasing /x, o , and /. 

FIGURE 7 Graphs of normalized electro-optic coefficient versus chromophore number density N. The symbols have the same meaning as in Fig. 6. 

FIGURE 8 Experimental (diamonds) and theoretical (solid line) values of normalized electro-optic coefficient versus chromophore number density for the DR chromophore of Table 2. The theoretical graph corresponds to D = 3.83 x 10 and the assumption of spherically symmetric symmetry. 

Group theory can tell us which elements of K are non-zero and about equalities between non-zero elements, but numerical factors (like /2 in the first row of K) are simply a matter of how the Kiq are defined in terms of the constants K, K, K, and Kq, this being usually done in a way that reduces the number of numerical factors. In LiNb03 the electro-optic coefficient r33 is more than three times r13, which gives rise to a relatively large difference in refractive index in directions along and normal to the optic (z) axis, thus making this material particularly useftd in device applications. 

Fig. 3.25. The degree of order induced by poling can be determined using the results above to analyse the variation in second harmonic intensity as the poled sample is rotated about an axis normal to the fundamental beam. Generally, the low field limit, given by Equation (3.106), is found to apply and the degree of orientation is low. However, for molecules with large dipole moments th,e divergence from the low field limit shown in Fig. 3.25 can be observed, anil much higher orientation is obtained. The experimentally determined non-linearities are usually the electro-optical (r) and the second harmonic generation (d) coefficients. These are related to the hyperpolarisabilities by ...

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