Abstract
In this contribution we point out an analogy between a two-photon process with a chirped pulse, and Fresnel diffraction from a slit. We also demonstrate experimentally how the idea of a Fresnel zone plate can be used in a two-photon process to focus spectral energy of sub-picosecond pulses onto a small fraction of the large bandwidth of the original pulse.
© 1992 The Author(s)
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