Numerical simulations of the parametric difference-frequency-mixing process in the femtosecond regime are presented. The calculations indicate that sub-100 fs pulses may be produced in the 3 to 5 mu m range using available sources. Theoretical results are compared to experiments on asynchronous frequency-mixing of two femtosecond Ti:sapphire lasers.
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Agrawal GP., 2019, NONLINEAR FIBER OPTI, DOI 10.1016/C2018-0-01168-8