Abstract
A computer model has been used to investigate the pulse shape evolution of interacting waves during second harmonic generation and difference-frequency generation processes. Using general assumption and coupled equations theory we describe in detail the back and forth energy transfer in connection with pulse shape. Two type of phase-match (modal phase-match and quasi-phase-match) with experimental relevance are discussed. In the case of quasi-phase-match uniform and chirped grating are discussed. The connection of the model with material properties and non-linear optical (NLO) strength is presented. The proposed model have allowed us to derive the essential feature of pulse shaping and compressing that rely on NLO process only.
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