Abstract
A temperature-dependent Sellmeier equation is calculated for Ge. The accuracy of this temperature-dependent Sellmeier equation is compared with the internal consistency of the data. The phase-matching condition is discussed for four-wave mixing when two of the wave vectors are equal. The average power limit for four-wave mixing in a material like Ge is derived both for the case where one wave vector is fixed and for the case where two wave vectors are fixed. Using the derived Sellmeier equation, the average power limit for the four-wave mixing is calulated.
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