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J. C. Wyant
APPLIED OPTICS, Vol. 14, page 2622, November 1975
An analysis is performed to determine the accuracy with which an ac heterodyne lateral
shear interferometer can measure wavefront aberrations if a white light extended source is
used with the interferometer, and shot noise is the predominate noise source. The analysis
shows that for uniform circular or square sources larger than a derived minimum size, the
wavefront measurement accuracy depends only upon the radiance of the source and not upon
the angular subtense of the source. For a 1-msec integration time, a 25-cm2
collecting area, and a source radiance of 10 W/m2-sr the rms wavefront error is
approximately 1/30 wave, assuming the signal is shot noise limited. It is shown that for
both uniform circular and square sources an optimum shear distance is approximately 1/2
the aperture diameter required to resolve the light source. Comments are made on the
optimum shear for nonuniform radiance distributions.
URL:
http://www.opticsinfobase.org/abstract.cfm?URI=ao-14-11-2622 |
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John W. Hardy, Julius Feinleib, and James C. Wyant
Topical Meeting on Optical Propagation through Turbulence, July 1974
The possibility of compensating an optical imaging
system in real time to correct for the wavefront distortion produced by propagation of the
beam through a turbulent medium has been a subject of considerable recent interest. In
this talk we will describe an adaptive imaging system developed at Itek that has proved
the practical feasibility of real time optical phase correction, using the radiation
received from a distant reference source, and show some of the results that have been
obtained. |
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