Abstract
It is a well-known prediction1 in nonlinear optics that it is not possible within the perturbative limit to generate the third harmonic for a tightly-focused Gaussian beam in a positively dispersive medium. However, it has been shown in gases that third-harmonic emission can occur as the result of additional nonlinear processes such as the nonlinear refractive index2 and plasma formation.3,4
© 2001 Optical Society of America
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