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Coherent manipulation of quasi-particles is a crucial method to realizeultrafast switching of the relating macroscopic order. In this letter, westudied coherent phonon generation under strong light field which allows toinduce non-perturbative nonlinear optical phenomena in solids. The efficiencyof coherent phonon generation starts to saturate and deviate from thepronounced linear power dependence when the light intensity goes into thenon-perturbative regime. We propose a novel theoretical model based on Floquetpicture and show that the saturation is due to a limitation of the drivingforce inherent in non-resonant driving of the electronic system in thenon-perturbative regime.

Inherent Limit to Coherent Phonon Generation under Non-Resonant Light Field Driving