Abstract

Continuous testing at room temperature of large optics made of Zerodur has revealed a delayed elastic effect under low stress levels during both load and recovery after removal. Using a high-performance mechanical profilometer, a delayed strain of the order of 1% is realized over a period of a few weeks. The time-dependent phenomenon is elastic and reversible, but must be accounted for in various applications of optical design.

© 1992 Optical Society of America

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References

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  1. Schott Glass Technologies, Inc., Duryea, Pa. 18642.
  2. S. F. Jacobs, S. C. Johnston, G. A. Hansen, “Expansion hysteresis upon thermal cycling of Zerodur,” Appl. Opt. 23, 3014–3016 (1984).
    [CrossRef] [PubMed]
  3. S. F. Jacobs, S. C. Johnston, J. M. Sasian, M. Watson, J. D. Targore, D. Bass, “Surface figure changes due to thermal cycling hysteresis,” Appl. Opt. 26, 4438–4442 (1987).
    [CrossRef] [PubMed]
  4. S. F. Jacobs, D. Bass, “Improved dimensional stability of Corning 9600 and Schott Zerodur glass ceramics,” Appl. Opt. 28, 4045–4047 (1989).
    [CrossRef] [PubMed]
  5. J. Lubliner, J. E. Nelson, “Stressed mirror polishing: a technique for producing nonaxisymmetric mirrors,” Appl. Opt. 19, 2332–2340 (1980).
    [CrossRef] [PubMed]
  6. J. E. Nelson, G. Gabor, L. K. Hunt, J. Lubliner, T. S. Mast, “Stressed mirror polishing: fabrication of an off-axis paraboloid,” Appl. Opt. 19, 2341–2352 (1980).
    [CrossRef] [PubMed]
  7. N. W. Taylor, E. P. McNamara, J. Sherman, “A study of elastico-viscous properties of a soda-lime-silica glass at temperatures near the ‘Transformation point’,” J. Soc. Glass Technol. 21, 61–81 (1937).
  8. G. O. Jones, “The determination of the elastic and viscous properties of glass at temperatures below the annealing range,” J. Soc. Glass Technol. 21, 432–462 (1937).
  9. O. V. Mazurin, V. P. Klynev, “Delayed elastic deformation of quartz glasses,” Soviet J. Inorganic Mat. 10, 953–957 (1974).
  10. T. J. M. Visser, J. M. Stevels, “A method to separate delayed elasticity from viscous flow specially applied to borate glasses,” J. Non-Cryst. Solids 7, 365–375 (1972).
    [CrossRef]
  11. G. W. Scherer, Relaxation in Glass and Composites. (Wiley, New York, 1986).
  12. J. B. Murgatroyd, R. F. R. Sykes, “The delayed elastic effect in silicate glasses at room temperature,” J. Soc. Glass Technol. 31, 17–35 (1947).

1989 (1)

1987 (1)

1984 (1)

1980 (2)

1974 (1)

O. V. Mazurin, V. P. Klynev, “Delayed elastic deformation of quartz glasses,” Soviet J. Inorganic Mat. 10, 953–957 (1974).

1972 (1)

T. J. M. Visser, J. M. Stevels, “A method to separate delayed elasticity from viscous flow specially applied to borate glasses,” J. Non-Cryst. Solids 7, 365–375 (1972).
[CrossRef]

1947 (1)

J. B. Murgatroyd, R. F. R. Sykes, “The delayed elastic effect in silicate glasses at room temperature,” J. Soc. Glass Technol. 31, 17–35 (1947).

1937 (2)

N. W. Taylor, E. P. McNamara, J. Sherman, “A study of elastico-viscous properties of a soda-lime-silica glass at temperatures near the ‘Transformation point’,” J. Soc. Glass Technol. 21, 61–81 (1937).

G. O. Jones, “The determination of the elastic and viscous properties of glass at temperatures below the annealing range,” J. Soc. Glass Technol. 21, 432–462 (1937).

Bass, D.

Gabor, G.

Hansen, G. A.

Hunt, L. K.

Jacobs, S. F.

Johnston, S. C.

Jones, G. O.

G. O. Jones, “The determination of the elastic and viscous properties of glass at temperatures below the annealing range,” J. Soc. Glass Technol. 21, 432–462 (1937).

Klynev, V. P.

O. V. Mazurin, V. P. Klynev, “Delayed elastic deformation of quartz glasses,” Soviet J. Inorganic Mat. 10, 953–957 (1974).

Lubliner, J.

Mast, T. S.

Mazurin, O. V.

O. V. Mazurin, V. P. Klynev, “Delayed elastic deformation of quartz glasses,” Soviet J. Inorganic Mat. 10, 953–957 (1974).

McNamara, E. P.

N. W. Taylor, E. P. McNamara, J. Sherman, “A study of elastico-viscous properties of a soda-lime-silica glass at temperatures near the ‘Transformation point’,” J. Soc. Glass Technol. 21, 61–81 (1937).

Murgatroyd, J. B.

J. B. Murgatroyd, R. F. R. Sykes, “The delayed elastic effect in silicate glasses at room temperature,” J. Soc. Glass Technol. 31, 17–35 (1947).

Nelson, J. E.

Sasian, J. M.

Scherer, G. W.

G. W. Scherer, Relaxation in Glass and Composites. (Wiley, New York, 1986).

Sherman, J.

N. W. Taylor, E. P. McNamara, J. Sherman, “A study of elastico-viscous properties of a soda-lime-silica glass at temperatures near the ‘Transformation point’,” J. Soc. Glass Technol. 21, 61–81 (1937).

Stevels, J. M.

T. J. M. Visser, J. M. Stevels, “A method to separate delayed elasticity from viscous flow specially applied to borate glasses,” J. Non-Cryst. Solids 7, 365–375 (1972).
[CrossRef]

Sykes, R. F. R.

J. B. Murgatroyd, R. F. R. Sykes, “The delayed elastic effect in silicate glasses at room temperature,” J. Soc. Glass Technol. 31, 17–35 (1947).

Targore, J. D.

Taylor, N. W.

N. W. Taylor, E. P. McNamara, J. Sherman, “A study of elastico-viscous properties of a soda-lime-silica glass at temperatures near the ‘Transformation point’,” J. Soc. Glass Technol. 21, 61–81 (1937).

Visser, T. J. M.

T. J. M. Visser, J. M. Stevels, “A method to separate delayed elasticity from viscous flow specially applied to borate glasses,” J. Non-Cryst. Solids 7, 365–375 (1972).
[CrossRef]

Watson, M.

Appl. Opt. (5)

J. Non-Cryst. Solids (1)

T. J. M. Visser, J. M. Stevels, “A method to separate delayed elasticity from viscous flow specially applied to borate glasses,” J. Non-Cryst. Solids 7, 365–375 (1972).
[CrossRef]

J. Soc. Glass Technol. (3)

N. W. Taylor, E. P. McNamara, J. Sherman, “A study of elastico-viscous properties of a soda-lime-silica glass at temperatures near the ‘Transformation point’,” J. Soc. Glass Technol. 21, 61–81 (1937).

G. O. Jones, “The determination of the elastic and viscous properties of glass at temperatures below the annealing range,” J. Soc. Glass Technol. 21, 432–462 (1937).

J. B. Murgatroyd, R. F. R. Sykes, “The delayed elastic effect in silicate glasses at room temperature,” J. Soc. Glass Technol. 31, 17–35 (1947).

Soviet J. Inorganic Mat. (1)

O. V. Mazurin, V. P. Klynev, “Delayed elastic deformation of quartz glasses,” Soviet J. Inorganic Mat. 10, 953–957 (1974).

Other (2)

G. W. Scherer, Relaxation in Glass and Composites. (Wiley, New York, 1986).

Schott Glass Technologies, Inc., Duryea, Pa. 18642.

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Figures (9)

Fig. 1
Fig. 1

Stressing fixture to apply forces and moments to the Keck segments.

Fig. 2
Fig. 2

Fabrication-metrology mount.

Fig. 3
Fig. 3

Mirror distortion indication as a function of time after unloading the segment.

Fig. 4
Fig. 4

Multipoint profilometer beam with housed electronic probes.

Fig. 5
Fig. 5

Time constant evaluation.

Fig. 6
Fig. 6

Long-term profilometer stability for various times after stabilizing on an unstressed optical surface.

Fig. 7
Fig. 7

Probe drift beam-probe.

Fig. 8
Fig. 8

Mount settling.

Fig. 9
Fig. 9

Delayed elastic effect in Zerodur (stress approximately 100 psi).

Tables (1)

Tables Icon

Table I Desired Stressed State, Innermost Segment

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