This technique forms the basis for a form of heterodyne interferometry in which two frequency-shiftfted reference waves areused to obtain a resolution of thousandths of a wavelength.
This technique forms the basis for a form of heterodyne interferometry in which two frequency-shiftfted reference waves areused to obtain a resolution of thousandths of a wavelength. Leith and Upatnieks pioneered an o-axis version of this technique,which eliminated an unwanted twin image generated in the original formulation. The characteristic patterns generatedby this technique are sections of hyperboloidal surfaces, and are typically recorded in an emulsion. In this technique, lightfrom a laser is split into two parts, with one part being used to illuminate an object and the other part, called the referencebeam, illuminating the recording material, on which the object beam and reference beam produce an interference pattern. For10 points, identify this technique invented by Denis Gabor, in which illumination of the recording medium with the referencelight reveals a three-dimensional image of the object.
This technique forms the basis for a form of heterodyne interferometry in which two frequency-shiftfted reference waves areused to obtain a resolution of thousandths of a wavelength.
holography [or hologram]