Abstract

The stability of self-supporting dielectric film beam splitters at cryogenic temperature was studied with a test interferometer that allowed continuous visual monitoring of the surface figure. Test beam splitters using Mylar film remained flat to within a wavelength of visible light in a 3-cm diam central area during multiple cycles between room temperature and ~4 K. Factors that could affect the surface figure, such as assembly procedures and the mechanical design of the film holder, were studied to determine some of the conditions for employing Mylar beam splitters in cryogenic space instrumentation.

© 1986 Optical Society of America

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References

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  1. R. J. Bell, Introductory Fourier Transform Spectroscopy (Academic, New York, 1972).
  2. D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
    [CrossRef]
  3. S. Drapatz, R. Hofmann, R. Katterloher, “A Helium Cooled Michelson Interferometer for Far Infrared Astronomy on Spacelab,” in Proceedings, Eighth International Conference on Infrared and Millimeter Waves, Miami (1983), paper TH5.2.
  4. A. Rudman, “Cooled Beamsplitters Require Special Mounting,” Lasers Appl. IV, No. 12, 81 (1985).

1985

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

A. Rudman, “Cooled Beamsplitters Require Special Mounting,” Lasers Appl. IV, No. 12, 81 (1985).

Bell, R. J.

R. J. Bell, Introductory Fourier Transform Spectroscopy (Academic, New York, 1972).

Dahl, F.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Denner, H.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Drapatz, S.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

S. Drapatz, R. Hofmann, R. Katterloher, “A Helium Cooled Michelson Interferometer for Far Infrared Astronomy on Spacelab,” in Proceedings, Eighth International Conference on Infrared and Millimeter Waves, Miami (1983), paper TH5.2.

Grewing, M.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Hofmann, R.

S. Drapatz, R. Hofmann, R. Katterloher, “A Helium Cooled Michelson Interferometer for Far Infrared Astronomy on Spacelab,” in Proceedings, Eighth International Conference on Infrared and Millimeter Waves, Miami (1983), paper TH5.2.

Katterloher, R.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

S. Drapatz, R. Hofmann, R. Katterloher, “A Helium Cooled Michelson Interferometer for Far Infrared Astronomy on Spacelab,” in Proceedings, Eighth International Conference on Infrared and Millimeter Waves, Miami (1983), paper TH5.2.

Klipping, G.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Lange, G.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Lemke, D.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Martin, W.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Offerman, D.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Preussner, P.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Proetel, K.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Rudman, A.

A. Rudman, “Cooled Beamsplitters Require Special Mounting,” Lasers Appl. IV, No. 12, 81 (1985).

Adv. Space Res.

D. Lemke, M. Grewing, P. Preussner, W. Martin, D. Offerman, G. Lange, S. Drapatz, R. Katterloher, H. Denner, G. Klipping, F. Dahl, K. Proetel, “The German Infrared Laboratory (GIRL)-A Progress Report,” Adv. Space Res. 5, 11 (1985).
[CrossRef]

Lasers Appl.

A. Rudman, “Cooled Beamsplitters Require Special Mounting,” Lasers Appl. IV, No. 12, 81 (1985).

Other

R. J. Bell, Introductory Fourier Transform Spectroscopy (Academic, New York, 1972).

S. Drapatz, R. Hofmann, R. Katterloher, “A Helium Cooled Michelson Interferometer for Far Infrared Astronomy on Spacelab,” in Proceedings, Eighth International Conference on Infrared and Millimeter Waves, Miami (1983), paper TH5.2.

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Figures (5)

Fig. 1
Fig. 1

Schematic illustration of the test interferometer used to monitor the surface figure of Mylar beam splitters at low temperature. The observed interference pattern maps the surface of the test beam splitter which serves as one of the mirrors in the two-beam interferometer.

Fig. 2
Fig. 2

Cross section of the test beam splitter. The Mylar film is stretched over the aperture D by clamping rings. Tension is applied to the film by retaining screws.

Fig. 3
Fig. 3

Effect of heat treatment on the surface figure of Mylar beam splitters: (a) surface figure after heating at ~150°C for 1.5 h; (b) typical flatness after initial assembly of beam splitter. Each bright interference fringe represents a change by λref = 0.633 m in optical path or λref/2 in surface figure. The stressed film in (b) has relaxed substantially in (a) following the heat treatment.

Fig. 4
Fig. 4

Behavior of a Mylar test beam splitter during temperature cycling: (a) initial heat-treated film at room temperature; (b) 77 K; (c) 4.5 K; (d) room temperature at the end of the first cycle; (e) room temperature at the end of the second cycle; (f) room temperature at the end of the third cycle. Small changes occur to the surface figure, but a central area flat to λref or better over at least a 2-cm diameter was preserved at all times during the tests including periods of rapid temperature change. The surface returned to a predictable figure at room temperature after each cycle, demonstrating that Mylar beam splitters could be used reliably in remote cyrogenic instrumentation. All temperatures were measured on the film holder.

Fig. 5
Fig. 5

Behavior of the prototype Mylar beam splitter for the GIRL spectrometer: (a) initial heat-treated surface at room temperature; (b) 77 K; (c) room temperature at the end of the cycle. This beam splitter exhibited greater variation in surface figure with temperature change, including complete loss of interference fringes, than did any of the other test beam splitters. This difference was attributed to effects of differential contraction in the noncircular film holder for the GIRL spectrometer.

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