Abstract
A theory of THz optical frequency conversion using highly nondegenerate four-wave mixing (FWM) in a semiconductor laser is presented by small signal analysis. The analytical expressions for the conversion efficiency and the bandwidth of the converted signal are given. The optical frequency conversion is attributed to the mechanism of cavity enhanced highly nondegenerate FWM in a semiconductor laser in a range of 1 THz detuning frequency between the pump and the probe waves when the probe frequency is tuned closed to one of the resonance modes. The frequency conversion is mainly introduced by the nonlinear gain effect when the detuning frequency is very high. The frequency conversion efficiency is asymmetrical wrt the zero detuning frequency, which is caused by the interaction between the nonlinear gain effect and the carrier beating, especially when the detuning frequency is not very high. The bandwidth of the converted signal can be increased by increasing the bias current and the nonlinear gain coefficient of the laser.
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