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A high-field multi-THz source is used to study the nonlinear response of InSb under off-resonant excitation. Field-resolved four-wave mixing signals demonstrate clear signatures of a non-perturbative regime in agreement with numerical simulations.
Strong 4- and 6-wave-mixing is detected electro-optically when two multi-THz fields of 5 MV/cm interact in InSb. These processes are mediated by 2-photon interband transitions. A non-collinear geometry paves the way for background-free measurements.
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