Abstract
We theoretically calculate the line shapes of the third order, the cascaded third order, and the fifth order nonlinear processes in a femtosecond time-resolved four-wave mixing experiment. On the basis of the calculations, experimentally we distinguish the wavelength dependent contributions to the direct fifth order process and the cascaded third order process in bulk GaAs. Our results show that the cascaded process dominates at wavelengths near band gap resonance; however the direct process dominates away from resonance. The nonlinear susceptibilities χ(3) and χ(5) are also obtained.
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