Physics – Optics
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975josa...65..279d&link_type=abstract
Optical Society of America, Journal, vol. 65, Mar. 1975, p. 279-285.
Physics
Optics
1
Coherent Light, Holography, Imaging Techniques, Interferometry, Optical Data Processing, Speckle Patterns, Atmospheric Optics, Atmospheric Turbulence, Diffuse Radiation, Fourier Transformation, Irradiance, Optical Reflection, Scintillation, Signal Processing, Turbulence Effects
Scientific paper
The fundamental equivalence of several optical-processing schemes is explained. Holography, irradiance correlation, and speckle interferometry all utilize the irradiance distribution. It is shown that the speckle pattern observed when a laser beam is reflected from a diffuse surface is the time-independent analog of the signal used in the stellar interferometer described by Hanbury, Brown, and Twiss (1956). The speckle pattern can be processed by standard incoherent-optical techniques to yield information on the object radiance distribution. When this signal is processed by coherent-optical techniques, it is equivalent to the Gabor on-axis hologram or the Fourier-transform hologram, depending on the source configuration. Signals processed by any of these techniques are comparatively insensitive to atmospheric turbulence.
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