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The understanding of high order harmonic generation in gases exposed to strong laser fields has progressed significantly in recent years. Emphasis has shifted to the characterization and use of these harmonics as a coherent, high brightness source of XUV radiation. We have investigated some of the coherence properties of very high order harmonics in argon and neon by measuring the spectral distributions and the far-field spatial profiles of the harmonic radiation. We have conducted these studies at intensities both below and above the ionization saturation intensity.
© 1994 Optical Society of America
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