This paper presents a measurement of the second harmonic generation (SHG) from the nonlinear optical (NLO) dyes oriented by the internal electric field (E(i)) created by the preferential alignment of beta-crystallite dipoles in a poled blend of 80 wt % poly(vinylidene fluoride) and 20 wt % poly(methyl methacrylate) with optical clarity. SHG coefficients d(33) and d(31) are investigated as a function of NLO dye concentration and compared to the theoretical values. The thermal stability of d(33) and d(31) is studied, which has been compared those of E(i) and the pyroelectric coefficient reported in a previous paper.(10)