Abstract
High-order harmonic generation has recently been observed in rare gases at incident Nd:YAG and KrF laser intensities of 1013−1018 W/cm2, where the generated coherent radiation was in a range from the vacuum ultraviolet (VUV) to the soft x-ray.1-3 These experiments show that at such high intensities, the conventional perturbative nature of nonlinear atomic responses would be destroyed in the interaction; some anomalous intensity distributions, especially intensity plateaus, of observed high-order harmonics have received much attention as a new domain of nonlinear optics, possibly leading to the development of short-wavelength coherent radiation sources.
© 1991 Optical Society of America
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