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Shaped femtosecond pulses in the far infrared (IR) regime are required for various processes. However, current shaping techniques are limited to the visible and the near infrared. Difference frequency conversion is one method that can be used to transfer shaped pulses from the visible and the near infrared to the far infrared, however, the fidelity of the transfer process and the factors influencing the fidelity is not clear. In this paper difference frequency mixing (DFM) of shaped femtosecond pulses in non-linear crystals is simulated, the transfer of the shaped pulses to the far infrared wavelength is investigated and factors are identified that have an influence on the transfer fidelity. Difference frequency generated pulses, using a non linear crystal, is generated in the laboratory and measured for different double pulse separations and the transfer efficiency is investigated.