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- W2093256318 abstract "We consider effects which occur when four-wave sum frequency generation and multiphoton ionization are induced by lasers tuned near a three-photon resonance and simultaneously near or at a dipole allowed four-photon resonance. In studies with unfocused laser beams, if the phase mismatch of the generated four-wave-mixing field is large and the related two-photon resonance for the absorption of a four-wave-mixing photon and a laser photon results in strong absorption of the four-wave-mixing field, a coherent cancellation occurs between the pumping of the resonance by two- and four-photon processes. This interference effect occurs when the first laser is tuned on either side of the three-photon resonance and {vert bar}{Delta}{ital k}{sub {ital r}L}{vert bar}{much gt}1, where {Delta}{ital k}{sub {ital r}} is the mismatch and {ital L} is the length of the path of the laser beams in the gas. With focused laser beams large differences occur between ionization with unidirectional beams and with counterpropagating laser beams when {vert bar}{Delta}{ital k}{sub {ital r}b}{vert bar}{much gt}1, where {ital b} is the confocal parameter of the focused laser beams. Strong absorption of the four-wave-mixing field is shown not to be necessary for strong destructive interference with focused laser beams when the phase mismatch is large.more » This work also suggests an explanation for earlier experiments where the presence of a four-photon resonance enabled the generation of third-harmonic light in a positively dispersive wavelength region. We argue that this process can occur when the laser used to achieve the four-photon resonance is focused on the small {ital z} ({ital z} is the coordinate in the direction of propagation) side of the focal point of the laser responsible for the third-harmonic generation.« less" @default.
- W2093256318 created "2016-06-24" @default.
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- W2093256318 date "1991-12-01" @default.
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- W2093256318 title "Effects of four-wave mixing on four-photon resonance excitation and ionization in the presence of a three-photon intermediate state resonance enhancement" @default.
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- W2093256318 doi "https://doi.org/10.1103/physreva.44.7684" @default.
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