Second harmonic generation has been observed in electrically poled tellurite glasses with 80TeO 2 ·10Li 2 O·10Nb 2 O 5 and 70TeO 2 ·15Li 2 O·15Nb 2 O 5 compositions. The poling was carried out at 200 to 300°C for 30 min under applied dc field of 4 to 5 kV. To explain the mechanism generating the second-order nonlinearity in the poled tellurite glasses, it is proposed that strong local polarization is caused by migration of lithium ions and/or periodic orientation of lone pairs of electrons in the tellurium ions.
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Tanaka et al. (1993) studied this question.
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