Abstract

Two compound parabolic concentrators are used to create a 180°-field-of-view spectral filter. The collection optics are reflective and are designed to collimate the light through a multilayer interference filter and then to refocus it onto an optical detector. Assuming unit reflectance and no loss through the optical filter, this device operates at the thermodynamic collection limit.

© 1981 Optical Society of America

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References

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  1. E. Yablonovitch, “Thermodynamics of the fluorescent planar concentrator,” J. Opt. Soc. Am. 70, 1362 (1980).
    [CrossRef]
  2. P. Yeh, “Christiansen–Bragg filters,” Opt. Commun. 35, 9 (1980).
    [CrossRef]
  3. G. Remus, V. D. P. Sastri, “Fisheye field spectrograph” Appl. Opt. 17, 3076 (1978).
    [CrossRef] [PubMed]
  4. P. T. Ballard, “Detecting laser illumination for military countermeasures,” Laser Focus 17(4), 72 (1981).
  5. R. M. Lerner, “Limitations in the use of dielectric interference filters in wide angle optical receivers,” Appl. Opt. 10, 1914 (1971).
    [CrossRef] [PubMed]
  6. A. Rabl, “Comparison of solar concentrators,” Sol. Energy 18, 93 (1976).
    [CrossRef]
  7. R. Winston, “Light collection within the framework of geometrical optics,” J. Opt. Soc. Am. 60, 245 (1970).
    [CrossRef]
  8. W. T. Welford, Optics of Nonimaging Concentrators (Academic, New York, 1978), Chap. 4.
  9. R. B. Miles, “Laser beacon system for aircraft collision hazard determination,” Appl. Opt. 19, 2098 (1980).
    [CrossRef] [PubMed]
  10. L. M. Sweet, R. B. Miles, S. G. Webb, E. Y. Wong, “Wide field of view laser beacon system for three-dimensional aircraft position measurement,” presented at the 1981 American Society of Mechanical Engineers Winter Annual Meeting, Washington, D.C., November 15–20.

1981 (1)

P. T. Ballard, “Detecting laser illumination for military countermeasures,” Laser Focus 17(4), 72 (1981).

1980 (3)

1978 (1)

1976 (1)

A. Rabl, “Comparison of solar concentrators,” Sol. Energy 18, 93 (1976).
[CrossRef]

1971 (1)

1970 (1)

Ballard, P. T.

P. T. Ballard, “Detecting laser illumination for military countermeasures,” Laser Focus 17(4), 72 (1981).

Lerner, R. M.

Miles, R. B.

R. B. Miles, “Laser beacon system for aircraft collision hazard determination,” Appl. Opt. 19, 2098 (1980).
[CrossRef] [PubMed]

L. M. Sweet, R. B. Miles, S. G. Webb, E. Y. Wong, “Wide field of view laser beacon system for three-dimensional aircraft position measurement,” presented at the 1981 American Society of Mechanical Engineers Winter Annual Meeting, Washington, D.C., November 15–20.

Rabl, A.

A. Rabl, “Comparison of solar concentrators,” Sol. Energy 18, 93 (1976).
[CrossRef]

Remus, G.

Sastri, V. D. P.

Sweet, L. M.

L. M. Sweet, R. B. Miles, S. G. Webb, E. Y. Wong, “Wide field of view laser beacon system for three-dimensional aircraft position measurement,” presented at the 1981 American Society of Mechanical Engineers Winter Annual Meeting, Washington, D.C., November 15–20.

Webb, S. G.

L. M. Sweet, R. B. Miles, S. G. Webb, E. Y. Wong, “Wide field of view laser beacon system for three-dimensional aircraft position measurement,” presented at the 1981 American Society of Mechanical Engineers Winter Annual Meeting, Washington, D.C., November 15–20.

Welford, W. T.

W. T. Welford, Optics of Nonimaging Concentrators (Academic, New York, 1978), Chap. 4.

Winston, R.

Wong, E. Y.

L. M. Sweet, R. B. Miles, S. G. Webb, E. Y. Wong, “Wide field of view laser beacon system for three-dimensional aircraft position measurement,” presented at the 1981 American Society of Mechanical Engineers Winter Annual Meeting, Washington, D.C., November 15–20.

Yablonovitch, E.

Yeh, P.

P. Yeh, “Christiansen–Bragg filters,” Opt. Commun. 35, 9 (1980).
[CrossRef]

Appl. Opt. (3)

J. Opt. Soc. Am. (2)

Laser Focus (1)

P. T. Ballard, “Detecting laser illumination for military countermeasures,” Laser Focus 17(4), 72 (1981).

Opt. Commun. (1)

P. Yeh, “Christiansen–Bragg filters,” Opt. Commun. 35, 9 (1980).
[CrossRef]

Sol. Energy (1)

A. Rabl, “Comparison of solar concentrators,” Sol. Energy 18, 93 (1976).
[CrossRef]

Other (2)

W. T. Welford, Optics of Nonimaging Concentrators (Academic, New York, 1978), Chap. 4.

L. M. Sweet, R. B. Miles, S. G. Webb, E. Y. Wong, “Wide field of view laser beacon system for three-dimensional aircraft position measurement,” presented at the 1981 American Society of Mechanical Engineers Winter Annual Meeting, Washington, D.C., November 15–20.

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Figures (4)

Fig. 1
Fig. 1

Detailed view of a compound parabolic concentrator. For wide-angular acceptance, light over a half angle θ1 enters through the small hole with diameter d1 and is redirected to a smaller exit angle θ2 over a larger aperture d2.

Fig. 2
Fig. 2

Wide-field-of-view spectral filter consisting of two face-to-face compound parabolic concentrators separated by a narrow-linewidth interference filter.

Fig. 3
Fig. 3

Sample path of collected light through the face-to-face compound parabolic concentrators. Note that light entering at a small angle may emerge at a large angle.

Fig. 4
Fig. 4

Detailed intensity versus angle with a, no interference filter; b, a 30-Å filter; and c, a 10-Å filter. The structure at small angles is due to sudden changes in the number of reflections experienced by the light and to the varying response of the detector to light impinging at widely different angles.

Equations (4)

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θ 2 = n e 2 ( Δ λ / λ ) ,
d sin θ = constant ,
θ 2 = sin 1 ( d 1 / d 2 )
L = ½ ( d 1 + d 2 ) cot θ 2 .

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