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VOLUME 41 (1985) | ISSUE 2 | PAGE 66
Four-photon parametric luminescence during noncollinear two-frequency excitation
The spatial spectra of the four-photon parametric luminescence in sodium vapor have been measured during noncollinear two-frequency excitation of the 35-3D transition. These spectra have a clearly defined ring structure. This structure is interpreted on the basis of an analysis of the conditions for frequency and spatial phase matching in the four-photon parametric luminescence.