Electro-optic properties of ferroelectric 5PbO · 3GeO2 single crystal

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Abstract
Linear electro‐optic coefficients of 5PbO · 3GeO2 have been measured at 6328 Å. The values obtained at room temperature are r11=0.27, r22=2.3, r13=10.5, r33=15.3, r41=0.6, r51=6, and rc=5.3 (in 10−12 m/V). The relatively small values make the material unattractive for practical applications. Temperature dependence of r22, r13, and r33 have been measured up to above Tc, and the behavior supports the previous deduction that the high‐temperature phase is 6̄. It is found that the quadratic EO coefficients g13 and g33 are large compared with those for BO6 ferroelectrics and the values depend on the spontaneous polarization. The anomalous decrease of g13 and g33 has been observed in the vicinity of Tc.