Abstract

The high strength-to-weight ratio and thermal diffusivity of beryllium are very attractive to the optical system designer for many critical applications. In order to realize the potential advantages of beryllium, it is necessary to have mirror blanks figured to optical tolerances which are also dimensionally stable over the life of the system. As part of a program to improve the dimensional stability of beryllium, we have cataloged the properties of both Kanigen-coated and bare beryllium mirrors. The results presented in this report indicate the bare beryllium is to be preferred over Kanigen-coated beryllium for precision optical surfaces.

© 1970 Optical Society of America

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References

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  1. R. Shemenski, J. Beach, R. E. Maringer, J. Electrochem. Soc. 116, 402 (1969).
    [CrossRef]
  2. P. H. Langenbeck, Appl. Opt. 6, 1707 (1967).
    [CrossRef] [PubMed]
  3. R. A. Jones, P. L. Kadakia, J. Appl. Opt. 7, 1477 (1968).
    [CrossRef]
  4. R. G. Pilston, G. N. Steinberg, Appl. Opt. 8, 553 (1969).
  5. J. Moberly, W. Goggin, I. Brown, Int. J. Powder Met. 5, 63 (1969).
  6. R. M. Shemenski, R. E. Maringer, J. Less-Common Metals 17, 25 (1969).
    [CrossRef]

1969 (4)

R. G. Pilston, G. N. Steinberg, Appl. Opt. 8, 553 (1969).

J. Moberly, W. Goggin, I. Brown, Int. J. Powder Met. 5, 63 (1969).

R. M. Shemenski, R. E. Maringer, J. Less-Common Metals 17, 25 (1969).
[CrossRef]

R. Shemenski, J. Beach, R. E. Maringer, J. Electrochem. Soc. 116, 402 (1969).
[CrossRef]

1968 (1)

R. A. Jones, P. L. Kadakia, J. Appl. Opt. 7, 1477 (1968).
[CrossRef]

1967 (1)

Beach, J.

R. Shemenski, J. Beach, R. E. Maringer, J. Electrochem. Soc. 116, 402 (1969).
[CrossRef]

Brown, I.

J. Moberly, W. Goggin, I. Brown, Int. J. Powder Met. 5, 63 (1969).

Goggin, W.

J. Moberly, W. Goggin, I. Brown, Int. J. Powder Met. 5, 63 (1969).

Jones, R. A.

R. A. Jones, P. L. Kadakia, J. Appl. Opt. 7, 1477 (1968).
[CrossRef]

Kadakia, P. L.

R. A. Jones, P. L. Kadakia, J. Appl. Opt. 7, 1477 (1968).
[CrossRef]

Langenbeck, P. H.

Maringer, R. E.

R. M. Shemenski, R. E. Maringer, J. Less-Common Metals 17, 25 (1969).
[CrossRef]

R. Shemenski, J. Beach, R. E. Maringer, J. Electrochem. Soc. 116, 402 (1969).
[CrossRef]

Moberly, J.

J. Moberly, W. Goggin, I. Brown, Int. J. Powder Met. 5, 63 (1969).

Pilston, R. G.

R. G. Pilston, G. N. Steinberg, Appl. Opt. 8, 553 (1969).

Shemenski, R.

R. Shemenski, J. Beach, R. E. Maringer, J. Electrochem. Soc. 116, 402 (1969).
[CrossRef]

Shemenski, R. M.

R. M. Shemenski, R. E. Maringer, J. Less-Common Metals 17, 25 (1969).
[CrossRef]

Steinberg, G. N.

R. G. Pilston, G. N. Steinberg, Appl. Opt. 8, 553 (1969).

Appl. Opt. (2)

R. G. Pilston, G. N. Steinberg, Appl. Opt. 8, 553 (1969).

P. H. Langenbeck, Appl. Opt. 6, 1707 (1967).
[CrossRef] [PubMed]

Int. J. Powder Met. (1)

J. Moberly, W. Goggin, I. Brown, Int. J. Powder Met. 5, 63 (1969).

J. Appl. Opt. (1)

R. A. Jones, P. L. Kadakia, J. Appl. Opt. 7, 1477 (1968).
[CrossRef]

J. Electrochem. Soc. (1)

R. Shemenski, J. Beach, R. E. Maringer, J. Electrochem. Soc. 116, 402 (1969).
[CrossRef]

J. Less-Common Metals (1)

R. M. Shemenski, R. E. Maringer, J. Less-Common Metals 17, 25 (1969).
[CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Surface contour change as a result of polishing of Kanigen coated beryllium during optical polishing. The contours are plotted along the diameter represented by the minor axis of the ellipical interferogram.

Fig. 2
Fig. 2

Measured spectral reflectance of Kanigen coated surface on sample Ds-II with and without an evaporated aluminum overcoat.

Fig. 3
Fig. 3

Reflectance degradation (λ = 632.8 nm) of beryllium as functions of density. The effects of various oxide contents are also shown.

Fig. 4
Fig. 4

Spectral reflectance of polished beryllium, aluminized beryllium, and aluminized fused silica.

Fig. 5
Fig. 5

Interferograms of a polished, Kanigen coated S-200 grade beryllium (hot-pressed) at two temperatures. The samples are 105 mm in diameter.

Tables (2)

Tables Icon

Table I History of Two Kanigen-Coated Beryllium Samples

Tables Icon

Table II Thermal Stability of 105-mm diam Beryllium Samples

Equations (1)

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R = R 0 { 1 [ ( ρ 0 ρ ) 2 3 / ρ ] A ( V ) 2 3 } ,

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