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Second-Order Nonlinear Polarization in the Strong-Field Regime
[article]
2020
arXiv
pre-print
We theoretically and experimentally investigate the second-harmonic generation (SHG) in a strong laser field. Our prototype experiment with ZnO demonstrates distinct anisotropic distributions of SHG yield, which deviate from the normal perturbation nonlinear optics theory. The experimental results show that the second-order nonlinear susceptibility is no longer a constant and it changes in the strong-field regime. The new features of SHG are due to the so far overlooked polarization induced by
arXiv:2010.13298v1
fatcat:tdcqpvhg2bfnzfd7x2dgc6txdu