Ellipticized infrared lens providing balanced astigmatism

Details Ellipticized infrared lens providing balanced astigmatism Ellipticized infrared lens providing balanced astigmatism

1980-04-09

1982-01-26

Corbin, John K.

G02B 304

Patent

active

043125735

ABSTRACT:
An ellipticized singlet azimuth versus elevation optimized and aperture eemized nonspherical infrared lens of very low or even minimal F-number providing balanced astigmatism for wide angle infrared applications is described. The infrared lens has an elliptical periphery and surfaces defined by a system of nonlinear partial differential equations, the surfaces acting together to produce two perfect primary off-axis foci F and F' at a finite distance in back of the lens and two perfect conjugate off-axis foci F.sub..infin. and F'.sub..infin. in front of the lens at infinity; i.e., the infrared lens simultaneously focuses energy from the primary foci F and F' into two off-axis parallel ray plane wave beams directed towards infinity at equal but opposite angles with respect to the infrared lens axis. The infrared lens may be built of various materials such as vitreous quartz.

REFERENCES:
patent: 3146451 (1964-08-01), Sternberg

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