Real-time holograms generated by second-harmonic cross correlation of object and reference optical wave fields.

Three-dimensional holographic images of extended diffusing objects are simultaneously recorded and reconstructed by optical cross correlation in a second-order nonlinear crystal. An interaction geometry in which the phase-matched object and reference fields propagate slightly noncollinearly is particularly convenient for producing these second-harmonic-generated holograms.

Light-in-flight recording: high-speed holographic motion pictures of ultrafast phenomena: comment.

Concepts underlying a holographic method of recording light-wave-train motion pictures were first reported by Yu. N. Denisyuk and co-authors in 1969. Analyses from that period are presented here that relate the degree of temporal and spatial coherence of the laser source to the recorded and reconstructed holographic distributions.