Holography Papers
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Ming Chang, Ching-Piao Hu, Philip Lam and James C. Wyant
APPLIED OPTICS, Vol. 24, page 3780,
November 15, 1985
A digital phase shifting technique capable of
quantitatively determining the phase of holographic interferometric
displacement fringes is presented. This technique uses computer
control to take data and calculate surface deformation. The phase
value at each detector point can be calculated by taking four successive
intensity data frames with the reference phase shifted between each frame.
The displacement fringe order number can be assigned by adding or
subtracting 2p from a data pont until the phase
difference between adjacent data points is less than p.
Experimental results show that this technique can precisely determine a
fraction of a fringe with an accuracy of ±1o.
URL:
http://www.opticsinfobase.org/abstract.cfm?URI=ao-24-22-3780 |
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J. C. Wyant, B. F. Oreb, and
P. Hariharan
APPLIED OPTICS, Vol. 23, page
4020, 15 November 1984
Two-wavelength holography has been shown to be quite
useful for testing aspheric surfaces since it can produce interferograms
with a wide range of sensitivities. However, TWH has the drawback that
the accuracy attainable from measurements on photographs of the fringes is
limited. It is shown how this limitation can be overcome by using
electronic techniques to evaluate the phase distribution in the interference
pattern. URL:
http://www.opticsinfobase.org/abstract.cfm?URI=ao-23-22-4020 |
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James C. Wyant
Optics Letters, Vol. 1, page 130, October 1977
An analysis is presented for selecting the
important rainbow-hologram formation-setup parameters for minimization of the image blur.
URL:
http://www.opticsinfobase.org/abstract.cfm?URI=ol-1-4-130 |
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J. C. Wyant and M. P. Givens
APPLIED OPTICS, Vol. 9, page 810, April 1970
Theory and experiment show that
for a hologram object of two or more object points, the nonlinearity of the photographic
process causes reconstructed images in addition to both the desired reconstructed image
and the higher order reconstructed images. It is theoretically and experimentally shown
that for a plane object parallel to the hologram plane, some of these undesired images may
be focused in the plane of the desired reconstructed image.
URL:
http://www.opticsinfobase.org/abstract.cfm?URI=ao-9-4-810 |
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James C. Wyant and M. Parker Givens
JOSA, Vol. 59, page 1650, December 1969
An expression derived for hologram exposures
made along the straight-line portion of an H-D curve of a photographic plate gives the
first-order transmittance of a hologram made of several object points exposed
simultaneously (conventional holograms). This expression is compared with a similar
expression derived previously for holograms made of several object points exposed
sequentially (synthetic holograms). Theory and experiments show the effect of the
nonlinearity of the photographic process on the contrast of the reconstruction of
conventional holograms. Synthetic and conventional holograms are studied theoretically and
experimentally to determine how the total amount of light in the reconstruction image
depends upon the number of object points when the total amount of light in the object is
constant. It is shown that the reconstructed image formed by a conventional hologram
contains more light than the image formed by a synthetic hologram of the same number of
object points. Both synthetic and conventional holograms are also studied to determine the
ratio of reference-beam illuminance to object-beam illuminance that maximizes the amount
of light in the reconstructed image.URL:
http://www.opticsinfobase.org/abstract.cfm?URI=josa-59-12-1650 |
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James C. Wyant and M. Parker Givens
JOSA, Vol. 58, page 357, March 1968
An expression derived for hologram exposures
made along the straight-line portion of the H-D curve of a photographic plate shows that
the relationship between the luminance of the reconstructed hologram image and the
luminance of the original object depends on the value and sign of the gamma of the
photographic processes.
To check the theory, several holograms of different exposures were superimposed on Kodak
649-F plates that were pre-flashed with a uniform illuminance so the H-D curve of the
photographic process is straight. The calculated and measured luminance ratios of the
different reconstructions agree within experimental error. Since the gamma of the usual
photographic process is positive, instead of negative, even if the gamma of the
photographic process is equal to 2, it is not valid to assume that the relative luminance
of the reconstruction of a given superimposed hologram is proportional to the product of
the exposure due to the object beam and the exposure due to the reference beam used in the
making of the hologram. This assumption would be valid for all fringe contrasts only if
gamma were -2.URL:
http://www.opticsinfobase.org/abstract.cfm?URI=josa-58-3-357 |
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