Harmonic generation has seen many applications since its discovery in 1961.1 The simple theories of harmonic generation assume that the incident radiation is monochromatic,2 and in fact most schemes for producing high efficiency harmonic generation involve the use of single mode or at least narrowband lasers.3,4 When using broad-band input fields, the efficiency of the harmonic generation process has been shown to decrease when using the conventional configuration for harmonic generation,5 Many applications of harmonic generation, however, involve the use of a broadband input laser, generally requiring the use of thinner cyrstals at the expense of decreased conversion efficiency or increased input intensities.

© 1989 Optical Society of America

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