Spatiotemporal heterodyne detection.
We describe a scheme in which a camera is turned into an efficient tunable frequency filter of a few-Hertz bandwidth in an off-axis, heterodyne optical mixing configuration, enabling one to perform parallel, high-resolution coherent spectral imaging. This approach is made possible through the combination of a spatial and temporal modulation of the signal to reject noise contributions. Experimental data obtained with dynamically scattered light by a suspension of particles in Brownian motion is interpreted.
Atlan
Michael
M
Laboratoire Kastler Brossel, Université Pierre et Marie-Curie, Centre National de la Recherche Scientifique, UMR 8552, Paris, France. atlan@optique,espci.fr
Gross
Michel
M
D005374:Filtration; D008962:Models, Theoretical; D055095:Optics and Photonics; D012542:Scattering, Radiation; D013997:Time Factors