Hybrid diffractive/refractive lens

Details Hybrid diffractive/refractive lens Hybrid diffractive/refractive lens

1991-06-03

1993-06-29

Arnold, Bruce Y.

Optical: systems and elements

Diffraction

From grating

359566, 359641, 359718, 359719, 359742, G02B 2744, G02B 518, G02B 308

Patent

active

052239780

ABSTRACT:
A hybrid lens for collimating, with low optical aberrations, an asymmetrically diverging input wavefront. The hybrid lens has a front surface which serves to diffract the input wavefront and a back surface which serves to refract the wavefront. Embodiments are described comprised of either a single plano-convex optical lens or a pair of lenses, one of which is a plano lens and the other or which is plano-convex. In either alternative, the convex surface is spherical. The planar surface of the single plano-convex lens or the back lens surface of the plano lens is optimized such that each ray of light from a diverging input light source will travel the same optical path length in reaching a predetermined collimation plane. This optimization is done by means of binary optic technology which uses a reactive-ion etch to form the requisite eight-level binary optic diffraction pattern. The widths of the fringe patterns generated by the three masks determined by calculations of the optical path difference between on-axis and off-axis rays which are traced through the hybrid lens.

REFERENCES:
patent: 4668053 (1987-05-01), Nishi et al.
patent: 4846552 (1989-07-01), Veldkamp et al.
patent: 4895790 (1990-01-01), Swanson et al.
patent: 4902113 (1990-02-01), Ishiwata
patent: 5044706 (1991-09-01), Chen
Cox, J. Allen "Binary Optics Offers New Freedom to Systems Designers" Laser Focus World Aug. 1989 pp. 47-52.
Maschmeyer, Richard O., et al. "Precision Molded-glass Optics" Applied Optics vol. 22, No. 16, Aug. 15, 1983 pp. 2410-2412.

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