Method and means to cancel diffraction effects from radiation fi

Details Method and means to cancel diffraction effects from radiation fi Method and means to cancel diffraction effects from radiation fi

1988-06-17

1992-09-15

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

343912, 359562, 359868, G02B 2742

Patent

active

051483157

ABSTRACT:
A method for cancelling or minimizing the effects of diffraction in wave fields in a wide range of imaging instruments such as telescopes, radar, cameras, ultrasound imaging devices and others, or from laser beams, is described, based on the premise that diffraction is associated with the bending of the energy streamlines of a field, so that such cancellation or minimization of diffraction effects is accomplished by shortening the optical path length normal to the aperture systematically by a function D(x) which has the general form of a superellipse with a minor axis of L and a major axis of A/2, where L is the wave-length of the wave-field, and A is the width or diameter of the aperture, so that the bent streamlines of energy flow near the aperture edge are straightened and the resulting diffraction standing wave pattern is cancelled.

REFERENCES:
patent: 3732363 (1973-05-01), Glenn, Jr.
patent: 3770340 (1973-11-01), Cronin et al.
Durnin et al., "Diffraction-Free Beams," Physical Review Letters, vol. 58, No. 15, Apr. 13, 1987, pp. 1499 to 1501.
Frank Crawford, "Elementary Derivation of the Wake Pattern of a Boat," American Journal of Physics, vol. 52, No. 9, Sep. 1984, pp. 782 to 785.
J. Durnin, "Exact Solutions for Nondiffracting Beams. I. The Scalar Theory," Journal of the Optical Society of America, vol. 4, No. 4, Apr. 1987, pp. 651 to 654.
Hecht et al., Optics, Addison-Wesley Co., Reading, Mass., 1974, p. 465, FIGS. 14.6(a) and (b).

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