Applied Physics Letters · 1968 · 50 citations · 6 references
Natural SciencesPhysicsOpticsOptoelectronicsRadiation MeasurementInfrared SpectroscopyOptical ImagingOptical SourcesPhysical OpticsAngular ResolutionBeam DivergenceFrequency-dependent RadiationInfrared OpticsPoint SourcesRayleigh CriterionRayleigh WavesSum-frequency Generation
10.6-μm radiation from a pair of point sources at optical infinity has been mixed with collimated ruby-laser radiation in Proustite. The sum-frequency radiation at 6516 Å so produced was then focused with a camera lens to form a visible image of the infrared sources. With a pump-laser beam divergence of 1.2 mrad the minimum resolvable angular separation of the infrared sources was 15 mrad according to the Rayleigh criterion.
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Interactions between Light Waves in a Nonlinear Dielectric
John A. Armstrong, N. Bloembergen, J. Ducuing et al. · Physical Review · 1962 · 4.3K citations · Full text