Abstract

In order to correct secondary longitudinal chromatic aberration in conventional refracting optical systems, it is necessary to use at least one optical material having anomalous partial dispersion. A novel lens system with correction of the secondary spectrum by using only normal glasses is presented. The lens system comprises three widely separated lens components; both second and third components are subaperture. The presented example of an apochromatic telescope demonstrates secondary spectrum correction with the use of only crown BK7 and flint F2, which are among the most inexpensive optical glasses available at the market. Two more similar designs are presented, both with the use of low-cost slightly anomalous dispersion glasses. These telescopes have a higher relative aperture and a smaller tertiary spectrum.

© 2006 Optical Society of America

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References

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  1. E. L. McCarthy, "Optical system with corrected secondary spectrum," U.S. patent 2,698,555 (4 January 1955).
  2. C. G. Wynne, "Secondary spectrum correction with normal glasses," Opt. Commun. 21, 419-424 (1977).
    [CrossRef]
  3. C. G. Wynne, "A comprehensive first-order theory of chromatic aberration secondary spectrum correction without special glasses," Opt. Acta 25, 627-636 (1978).
    [CrossRef]
  4. M. Rosete-Aguilar, "Correction of secondary spectrum using standard glasses," in Design and Engineering of Optical Systems,J. J. Braat , ed., Proc. SPIE 2774, 378-386 (1996).
  5. M. Rosete-Aguilar, "Application of the extended first-order chromatic theory to the correction of secondary spectrum," Rev. Mex. Fís. 43, 895-905 (1997).
  6. M. J. Kidger, Intermediate Optical Design (SPIE, 2004), pp. 109-112.
    [CrossRef]

1997 (1)

M. Rosete-Aguilar, "Application of the extended first-order chromatic theory to the correction of secondary spectrum," Rev. Mex. Fís. 43, 895-905 (1997).

1996 (1)

M. Rosete-Aguilar, "Correction of secondary spectrum using standard glasses," in Design and Engineering of Optical Systems,J. J. Braat , ed., Proc. SPIE 2774, 378-386 (1996).

1978 (1)

C. G. Wynne, "A comprehensive first-order theory of chromatic aberration secondary spectrum correction without special glasses," Opt. Acta 25, 627-636 (1978).
[CrossRef]

1977 (1)

C. G. Wynne, "Secondary spectrum correction with normal glasses," Opt. Commun. 21, 419-424 (1977).
[CrossRef]

1955 (1)

E. L. McCarthy, "Optical system with corrected secondary spectrum," U.S. patent 2,698,555 (4 January 1955).

Kidger, M. J.

M. J. Kidger, Intermediate Optical Design (SPIE, 2004), pp. 109-112.
[CrossRef]

McCarthy, E. L.

E. L. McCarthy, "Optical system with corrected secondary spectrum," U.S. patent 2,698,555 (4 January 1955).

Rosete-Aguilar, M.

M. Rosete-Aguilar, "Application of the extended first-order chromatic theory to the correction of secondary spectrum," Rev. Mex. Fís. 43, 895-905 (1997).

M. Rosete-Aguilar, "Correction of secondary spectrum using standard glasses," in Design and Engineering of Optical Systems,J. J. Braat , ed., Proc. SPIE 2774, 378-386 (1996).

Wynne, C. G.

C. G. Wynne, "A comprehensive first-order theory of chromatic aberration secondary spectrum correction without special glasses," Opt. Acta 25, 627-636 (1978).
[CrossRef]

C. G. Wynne, "Secondary spectrum correction with normal glasses," Opt. Commun. 21, 419-424 (1977).
[CrossRef]

J. J. Braat (1)

M. Rosete-Aguilar, "Correction of secondary spectrum using standard glasses," in Design and Engineering of Optical Systems,J. J. Braat , ed., Proc. SPIE 2774, 378-386 (1996).

Opt. Acta (1)

C. G. Wynne, "A comprehensive first-order theory of chromatic aberration secondary spectrum correction without special glasses," Opt. Acta 25, 627-636 (1978).
[CrossRef]

Opt. Commun. (1)

C. G. Wynne, "Secondary spectrum correction with normal glasses," Opt. Commun. 21, 419-424 (1977).
[CrossRef]

Rev. Mex. Fís. (1)

M. Rosete-Aguilar, "Application of the extended first-order chromatic theory to the correction of secondary spectrum," Rev. Mex. Fís. 43, 895-905 (1997).

Other (2)

M. J. Kidger, Intermediate Optical Design (SPIE, 2004), pp. 109-112.
[CrossRef]

E. L. McCarthy, "Optical system with corrected secondary spectrum," U.S. patent 2,698,555 (4 January 1955).

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Figures (5)

Fig. 1
Fig. 1

Section drawings of the design examples.

Fig. 2
Fig. 2

Paraxial color curve of the 70 mm f∕7 apochromatic telescope with the use of normal glasses.

Fig. 3
Fig. 3

Strehl ratio as a function of wavelength for the 70 mm f∕7 apochromatic telescope with the use of normal glasses. The solid curve corresponds to the on-axis Strehl ratio and the dashed curve to 0.25° off-axis. The dotted reference curve shows the on-axis Strehl ratio for a standard achromat of the same aperture and length.

Fig. 4
Fig. 4

Strehl ratio as a function of wavelength for the 90 mm f∕7 apochromatic telescope with the use of normal glasses and N-FK5.

Fig. 5
Fig. 5

Strehl ratio as a function of wavelength for the 100 mm f∕4.5 apochromatic telescope with the use of dense flint glasses.

Tables (3)

Tables Icon

Table 1 Prescription of 70 mm f ∕7 Apochromatic Telescope with the Use of Normal Glasses (Dimensions in Millimeters)

Tables Icon

Table 2 Prescription of 90 mm f ∕7 Apochromatic Telescope with the Use of Normal Glasses and N-FK5

Tables Icon

Table 3 Prescription of 100 mm f ∕4.5 Apochromatic Telescope with Use of Dense Flint Glasses

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