Passive athermalization of optics

Details Passive athermalization of optics Passive athermalization of optics

1994-01-13

1996-04-02

Sugarman, Scott J.

Optical: systems and elements

Lens

Single component with multiple elements

359365, 359661, 359784, 359793, 359558, G02B 900, G02B 2102, G02B 912, G02B 904

Patent

active

055046282

ABSTRACT:
A doublet lens is optically passively athermalized by choosing two lens materials that have approximately the same Abbe number and substantially different thermal coefficients of refractive index. The ratio of the powers of the lens elements is designed to provide the desired passive athermalization. A diffractive surface is used on one of the lens elements to correct for chromatic aberration. Because the Abbe numbers are approximately the same for the two lens materials, the chromatic correction does not significantly change with temperature. This allows the ratio of the powers of the lens elements to control the focal length of the doublet with temperature being independent of chromatic correction.

REFERENCES:
patent: 4505535 (1985-03-01), Neil
patent: 5363235 (1994-11-01), Kiunke et al.
"Athermal Infrared Optics", Robert Gibbons, Equipment Group, Feb. 1976, Texas Instruments Incorporated, pp. 1-12.

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