Lens/zone plate combination for chromatic dispersion correction

Details Lens/zone plate combination for chromatic dispersion correction Lens/zone plate combination for chromatic dispersion correction

1993-08-31

1995-08-15

Shafer, Ricky D.

Optical: systems and elements

Having significant infrared or ultraviolet property

Lens, lens system or component

359356, 359565, 359569, 359571, G02B 1314, G02B 2744, G02B 518

Patent

active

054424801

ABSTRACT:
Chromatic dispersion between first and second wavelengths of light is corrected by a lens/zone plate combination. The zone plate is adapted both to send most of the first wavelength light into its zeroth order and to send most of the second wavelength light into its first order and to change the focal length of the second wavelength light to coincide with the focal length of the first wavelength light. A preferred embodiment includes a zinc/selinide sulfide lens having a zone plate etched onto one of its surfaces. The zone plate has a multi-step phase profile including four phase levels. The lens/zone plate combination is particularly adapted for use with CO.sub.2 and HeNe lasers to bring their focal lengths into coincidence.

REFERENCES:
patent: 4637697 (1987-01-01), Freeman
patent: 4639091 (1987-01-01), Huignard et al.
patent: 4813762 (1989-03-01), Leger et al.
patent: 4846552 (1989-07-01), Veldkamp et al.
patent: 4895790 (1990-01-01), Swanson et al.
patent: 4936665 (1990-06-01), Whitney
patent: 4966446 (1990-10-01), Huang et al.
patent: 5044706 (1991-09-01), Chen
Stone et al; "Hybrid Diffractive-Refractive Lenses and Achromats"; Applied Optics/vol. 27, No. 14/15 Jul. 1988 pp. 2960-2971.
Ishiwatari, "An Optical Cable for a CO.sub.2 Laser Scalpel", Journal of Lighwave Technology, LT-4, Aug. 1986, pp. 1273-1279.

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