Abstract

The next century is knocking on our door, bringing with it the possibility of telescopes even bigger than the 8–10-m-class instruments that have proliferated over the past decade. The fixed spherical reflector is the most economical and pragmatic way to construct an extremely large primary mirror (30–50 m in diameter). Although spherical mirrors have virtues such as manufacturability and identically figured segments, they also create great amounts of spherical aberration and coma. Here we show that there are several catoptric (all-reflecting) corrector designs that enable a fast telescope based on a spherical primary mirror.

© 2000 Optical Society of America

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References

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  1. L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
    [CrossRef]
  2. T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).
  3. A. Meinel, M. Meinel, “Some comments on scaling law information relating to very large telescope coast goals,” in Optical and Infrared Telescopes for the 1990s, A. Hewitt, ed., Proceedings of the Kitt Peak National Observatory Conference, (Kitt Peak National Observatory, Tucson, Ariz., 1980), Vol. II, pp. 1027–1042.
  4. R. N. Wilson, Reflecting Telescopes Optics (Springer-Verlag, Berlin, 1996), Vol. 1, Chap. 3, pp. 229–246.
  5. J. M. Sasian, “Four-mirror optical system for large telescopes,” Opt. Eng. 29, 1181–1185 (1990).
    [CrossRef]
  6. J. M. Sasian, “Flat-field, anastigmatic, four-mirror optical system for large telescopes,” Opt. Eng. 26, 1197–1199 (1987).
    [CrossRef]
  7. A. Baranne, G. Lemaı̂tre, “The LOOM Project I—the TEMOS concept,” in Workshop on Large Telescopes, K. J. Fricke, ed., Mitt. Astron. Ges.67, 226–232 (1986).
  8. A. Baranne, G. Lemaı̂tre, “Combinaisons optiques pour les très grands télescopes: le concept TEMOS,” C. R. Acad. Sci. Ser. II Mec. Phys. Chim. Sci. Terre Univers 305, 445–450 (1987).
  9. A. Baranne, “A single-axis 4-mirror system: large spherical field and small fields,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 879–883 (1998).
    [CrossRef]
  10. R. K. Jungquist, “Optical design of Hobby-Eberly Telescope four mirror spherical aberration corrector,” in Current Developments in Optical Design and Optical Engineering VIII,R. E. Fischer, W. J. Smith, eds., Proc. SPIE3779, 2–16 (1999).
    [CrossRef]
  11. P. N. Robb, “Three-mirror telescopes: design and optimization,” Appl. Opt. 17, 2677–2685 (1978).
    [CrossRef] [PubMed]

1990 (1)

J. M. Sasian, “Four-mirror optical system for large telescopes,” Opt. Eng. 29, 1181–1185 (1990).
[CrossRef]

1987 (2)

J. M. Sasian, “Flat-field, anastigmatic, four-mirror optical system for large telescopes,” Opt. Eng. 26, 1197–1199 (1987).
[CrossRef]

A. Baranne, G. Lemaı̂tre, “Combinaisons optiques pour les très grands télescopes: le concept TEMOS,” C. R. Acad. Sci. Ser. II Mec. Phys. Chim. Sci. Terre Univers 305, 445–450 (1987).

1978 (1)

Adams, M. T.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Baranne, A.

A. Baranne, G. Lemaı̂tre, “Combinaisons optiques pour les très grands télescopes: le concept TEMOS,” C. R. Acad. Sci. Ser. II Mec. Phys. Chim. Sci. Terre Univers 305, 445–450 (1987).

A. Baranne, “A single-axis 4-mirror system: large spherical field and small fields,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 879–883 (1998).
[CrossRef]

A. Baranne, G. Lemaı̂tre, “The LOOM Project I—the TEMOS concept,” in Workshop on Large Telescopes, K. J. Fricke, ed., Mitt. Astron. Ges.67, 226–232 (1986).

Barnes, T. G.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Bash, F. N.

T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).

Booth, J. A.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Cornell, M. E.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Fowler, J. R.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Gaffney, N.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Glaspey, J. W.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Good, J.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Hill, G. J.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Jungquist, R. K.

R. K. Jungquist, “Optical design of Hobby-Eberly Telescope four mirror spherical aberration corrector,” in Current Developments in Optical Design and Optical Engineering VIII,R. E. Fischer, W. J. Smith, eds., Proc. SPIE3779, 2–16 (1999).
[CrossRef]

Kelton, P. W.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Krabbendam, V. L.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Lemai^tre, G.

A. Baranne, G. Lemaı̂tre, “Combinaisons optiques pour les très grands télescopes: le concept TEMOS,” C. R. Acad. Sci. Ser. II Mec. Phys. Chim. Sci. Terre Univers 305, 445–450 (1987).

A. Baranne, G. Lemaı̂tre, “The LOOM Project I—the TEMOS concept,” in Workshop on Large Telescopes, K. J. Fricke, ed., Mitt. Astron. Ges.67, 226–232 (1986).

Long, L.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

MacQueen, P. J.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Meinel, A.

A. Meinel, M. Meinel, “Some comments on scaling law information relating to very large telescope coast goals,” in Optical and Infrared Telescopes for the 1990s, A. Hewitt, ed., Proceedings of the Kitt Peak National Observatory Conference, (Kitt Peak National Observatory, Tucson, Ariz., 1980), Vol. II, pp. 1027–1042.

Meinel, M.

A. Meinel, M. Meinel, “Some comments on scaling law information relating to very large telescope coast goals,” in Optical and Infrared Telescopes for the 1990s, A. Hewitt, ed., Proceedings of the Kitt Peak National Observatory Conference, (Kitt Peak National Observatory, Tucson, Ariz., 1980), Vol. II, pp. 1027–1042.

Moretto, G.

T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).

Ramsey, L. W.

T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Ray, F. B.

T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Ricklefs, R. L.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Robb, P. N.

Sage, J.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Sasian, J. M.

J. M. Sasian, “Four-mirror optical system for large telescopes,” Opt. Eng. 29, 1181–1185 (1990).
[CrossRef]

J. M. Sasian, “Flat-field, anastigmatic, four-mirror optical system for large telescopes,” Opt. Eng. 26, 1197–1199 (1987).
[CrossRef]

Sebring, T. A.

T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Spiesman, W. J.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Steiner, M.

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

Wilson, R. N.

R. N. Wilson, Reflecting Telescopes Optics (Springer-Verlag, Berlin, 1996), Vol. 1, Chap. 3, pp. 229–246.

Appl. Opt. (1)

C. R. Acad. Sci. Ser. II Mec. Phys. Chim. Sci. Terre Univers (1)

A. Baranne, G. Lemaı̂tre, “Combinaisons optiques pour les très grands télescopes: le concept TEMOS,” C. R. Acad. Sci. Ser. II Mec. Phys. Chim. Sci. Terre Univers 305, 445–450 (1987).

Opt. Eng. (2)

J. M. Sasian, “Four-mirror optical system for large telescopes,” Opt. Eng. 29, 1181–1185 (1990).
[CrossRef]

J. M. Sasian, “Flat-field, anastigmatic, four-mirror optical system for large telescopes,” Opt. Eng. 26, 1197–1199 (1987).
[CrossRef]

Other (7)

A. Baranne, G. Lemaı̂tre, “The LOOM Project I—the TEMOS concept,” in Workshop on Large Telescopes, K. J. Fricke, ed., Mitt. Astron. Ges.67, 226–232 (1986).

A. Baranne, “A single-axis 4-mirror system: large spherical field and small fields,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 879–883 (1998).
[CrossRef]

R. K. Jungquist, “Optical design of Hobby-Eberly Telescope four mirror spherical aberration corrector,” in Current Developments in Optical Design and Optical Engineering VIII,R. E. Fischer, W. J. Smith, eds., Proc. SPIE3779, 2–16 (1999).
[CrossRef]

L. W. Ramsey, M. T. Adams, T. G. Barnes, J. A. Booth, M. E. Cornell, J. R. Fowler, N. Gaffney, J. W. Glaspey, J. Good, G. J. Hill, P. W. Kelton, V. L. Krabbendam, L. Long, P. J. MacQueen, F. B. Ray, R. L. Ricklefs, J. Sage, T. A. Sebring, W. J. Spiesman, M. Steiner, “The early performance and present status of the Hobby–Eberly Telescope,” in Advanced Technology Optical/IR Telescopes VI, L. M. Stepp, ed., Proc. SPIE3352, 34–42 (1998).
[CrossRef]

T. A. Sebring, G. Moretto, F. N. Bash, F. B. Ray, L. W. Ramsey, “The extremely large telescope (ELT), a scientific opportunity; an engineering certainty,” in Workshop on Extremely Large Telescopes, T. Andersen, ed. (Lund Observatory, Lund, Sweden, 1999).

A. Meinel, M. Meinel, “Some comments on scaling law information relating to very large telescope coast goals,” in Optical and Infrared Telescopes for the 1990s, A. Hewitt, ed., Proceedings of the Kitt Peak National Observatory Conference, (Kitt Peak National Observatory, Tucson, Ariz., 1980), Vol. II, pp. 1027–1042.

R. N. Wilson, Reflecting Telescopes Optics (Springer-Verlag, Berlin, 1996), Vol. 1, Chap. 3, pp. 229–246.

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Figures (12)

Fig. 1
Fig. 1

ELT baseline layout. At A is the compact structure necessary for the Arecibo mode. A. At B is six-legged Stewart Platform that holds the catoptric corrector normal to the aberrated spherical primary mirror.

Fig. 2
Fig. 2

Single-axis four-mirror corrector for an f/1.42 spherical primary mirror yielding an f/5 ELT system optimized across a 6 arc min FOV. The upper right-hand side shows details of the corrector system.

Fig. 3
Fig. 3

(A) Point-spread function computed across the 6 arc min FOV. (B) EED on axis and for a 6-arc-min field diameter.

Fig. 4
Fig. 4

Optical performance of the corrector inside a 6 arc min FOV. The Σ-diameter of circles is the mean value of the circle diameter (in seconds of arc), with 80% of encircled energy (EE), for the eight spot positions (F i , i = 1, … 8) at the edge of the FOV diameter (1.5, 3.0, 4.5, or 6.0), as shown at the top of the figure.

Fig. 5
Fig. 5

Shorter f/5 ELT corrector, optimized across a 3 arc min FOV.

Fig. 6
Fig. 6

Shorter f/5 ELT corrector optical performance across a 3 arc min FOV.

Fig. 7
Fig. 7

Two-axis two-mirror corrector system for the ELT, optimized across a 3 arc min FOV. (A) and (B) are two possible configurations.

Fig. 8
Fig. 8

Two-axis two-mirror corrector optical performance across a 3 arc min FOV.

Fig. 9
Fig. 9

Single-axis three-mirror corrector for the f/5 ELT using a 25-m f/1.42 spherical primary mirror.

Fig. 10
Fig. 10

ELT f/5 single-axis three-mirror corrector optical performance. On the left side are the point spread functions for 6 arc min FOV and on the right the EED’s on and off axis.

Fig. 11
Fig. 11

Optical performance of the corrector inside a 6 arc min FOV. The Σ-diameter of circles is the mean value of the circle diameter (in seconds of arc), with 80% of encircled energy (EE), for the eight spot positions (F i , i = 1, … 8) at the edge of the FOV diameter (1.5, 3.0, 4.5, or 6.0) as shown at the top of the figure.

Fig. 12
Fig. 12

Correction produced by the single-axis three-mirror corrector for the f/5 ELT outside of the optimized 6 arc min FOV.

Tables (5)

Tables Icon

Table 1 ELT f/5 Design Parameters Optimized Across a 6 arc min FOVa

Tables Icon

Table 2 ELT f/5 Compact Design Parameters Optimized Across a 3 arc min FOVa

Tables Icon

Table 3 ELT f/5 Two-Axis Two-Mirror Design Parameters Optimized Across a 3 arc min FOVa

Tables Icon

Table 4 ELT f/5 Single-Axis Three-Mirror Design Parameters Optimized across a 6 arc min FOVa

Tables Icon

Table 5 Possible Corrector Designs for f/5 ELTa

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