Super-resolution optical element for use in image forming appara

Details Super-resolution optical element for use in image forming appara Super-resolution optical element for use in image forming appara

1993-02-25

1994-09-20

Epps, Georgia Y.

Coherent light generators

Particular beam control device

Optical output stabilization

372103, 369112, H01S 313

Patent

active

053495926

ABSTRACT:
An apodizer according to the present invention subjects a light beam to wavefront splitting, to thereby split it into a plurality of beam components such that each adjacent pair of them have phases differing from each other. The light beam components through the apodizer have phases inverted to one another, and are converged in a desired position of an image-forming surface. The beam spot of the converged light beam is smaller than a size limited by the refractive index of an objective lens. The intensities of sidelobes occurring around the beam spot are sufficiently reduced. When the apodizer is incorporated in an optical head device, the intensity of the center beam spot of a reflected laser beam is emphasized, which enables data reading from a disk medium of a high recording density.

REFERENCES:
patent: 4940308 (1990-07-01), Debesis
patent: 5121378 (1992-06-01), Hirose et al.
H. Ando, "Phase-Shifting Apodizer of Three or More aPortions", Jpn. J. Appl. Phys., vol. 31, (1992) pp. 557-567, Part 1, No. 28, Feb. 1992.

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