This letter reports the two-wave mixing experimental results of tetragonal Fe-doped KTa1−xNbxO3. A 7.3 cm−1 gain coefficient and 42% diffraction efficiency have been obtained. For the first time internally self-pumped phase conjugation is being observed in this crystal. At room temperature, the conjugate reflectivity measured is 21%.
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Wang et al. (1992) studied this question.
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