Abstract

A method for correcting spherical aberration and coma in fast two-element objectives using high-index materials is discussed. It involves use of an aplanatic lens with a single lens having a minimum spherical aberration and no coma. The method deals only with monochromatic designs. It can be effective in designing high-aperture aplanatic IR objectives. Optical data and performance characteristics of germanium and silicon two-lens systems designed by the proposed method are given.

© 1983 Optical Society of America

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References

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  1. R. Kingslake, Lens Design Fundamentals (Academic, New York, 1978), pp. 108–110.
  2. K. O. Gheevarughese, J. Opt. 7, No. 2, 39 (1978).

1978 (1)

K. O. Gheevarughese, J. Opt. 7, No. 2, 39 (1978).

Gheevarughese, K. O.

K. O. Gheevarughese, J. Opt. 7, No. 2, 39 (1978).

Kingslake, R.

R. Kingslake, Lens Design Fundamentals (Academic, New York, 1978), pp. 108–110.

J. Opt. (1)

K. O. Gheevarughese, J. Opt. 7, No. 2, 39 (1978).

Other (1)

R. Kingslake, Lens Design Fundamentals (Academic, New York, 1978), pp. 108–110.

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Figures (6)

Fig. 1
Fig. 1

Ray plots and spot diagrams—f/1 silicon two-lens system (Kingslake).

Fig. 2
Fig. 2

Ray plots and spot diagrams—f/1 germanium two-lens system (Kingslake’s method).

Fig. 3
Fig. 3

Action of aplanatic lens.

Fig. 4
Fig. 4

f/1 two-lens system.

Fig. 5
Fig. 5

Ray plots and spot diagrams—f/1 germanium two-lens system (alternate design).

Fig. 6
Fig. 6

Kay plots and spot diagrams—f/1 silicon two-lens system (alternate design).

Tables (5)

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Table I Design Data of Silicon Two-Lens System by Kingslake

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Table II Design Data of Germanium Two-Lens Sytstem: Initial Design

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Table III Design Data of Germanium Two-Lens System: Alternate Design

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Table IV Design Data of Two-Lens Silicon System: Alternate Design

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Table V Third-Order Monochromatic Aberrations of the Four Objectives at f/1 and 15-mrad field

Equations (1)

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U = I U = I ; N sin U = N sin U ; N sin U = ( N / N ) N sin U .

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