A holographic imaging spectrometer, apparatus, and/or method enables the projection of a two-dimensional (2D) slice (having spectral information) of a four-dimensional (4D) probing object. A 4D probing source object is illuminated to emit an optical field. A holographic element having one or more recorded...http://www.google.es/patents/US7158228?utm_source=gb-gplus-sharePatente US7158228 - Holographic imaging spectrometer
