Abstract

Studies of narrow-band interference filters have shown that two mechanisms exist that cause drift to shorter wavelengths. One is dependent on the thermal history of the filter, and the other depends on the radiation history. The present paper presents experimental results on thermal effects; and it is shown that by a proper bake cycle, ZnS–cryolite filters are stable for years if stored at less than 38°C.

© 1974 Optical Society of America

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References

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  1. S. A. Furman, Opt. Spectrosc. 28, 412 (1969).
  2. J. Meaburn, Appl. Opt. 5, 1757 (1966).
    [CrossRef] [PubMed]
  3. S. A. Furman, M. D. Levina, J. Sov. Opt. Technol. 38, 272 (1971).

1971 (1)

S. A. Furman, M. D. Levina, J. Sov. Opt. Technol. 38, 272 (1971).

1969 (1)

S. A. Furman, Opt. Spectrosc. 28, 412 (1969).

1966 (1)

Furman, S. A.

S. A. Furman, M. D. Levina, J. Sov. Opt. Technol. 38, 272 (1971).

S. A. Furman, Opt. Spectrosc. 28, 412 (1969).

Levina, M. D.

S. A. Furman, M. D. Levina, J. Sov. Opt. Technol. 38, 272 (1971).

Meaburn, J.

Appl. Opt. (1)

J. Sov. Opt. Technol. (1)

S. A. Furman, M. D. Levina, J. Sov. Opt. Technol. 38, 272 (1971).

Opt. Spectrosc. (1)

S. A. Furman, Opt. Spectrosc. 28, 412 (1969).

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Figures (9)

Fig. 1
Fig. 1

Schematic diagram of the dye laser monochromator test system. With this system variations in a filter’s peak transmission wavelength can be readily shown.

Fig. 2
Fig. 2

Set of photographs taken in the violet wing, center, and red wing, respectively, of the bandpass of a test filter. These filter photographs show a rectangular section that has been drifted toward shorter wavelengths by illumination.

Fig. 3
Fig. 3

Shown are the three positions that the 0.8-Å laser monochromator bandpass occupied with respect to the test filter profile in obtaining the photographs in Fig. 2.

Fig. 4
Fig. 4

Equatorially mounted filter test system for solar illumination exposure. Ten filters can be exposed with independent ambient temperatures, illumination levels, and spectral characteristics.

Fig. 5
Fig. 5

Exploded view of a filter test oven.

Fig. 6
Fig. 6

Exaggerated cross section of an interference filter showing how the coatings are completely enclosed with glass and epoxy.

Fig. 7
Fig. 7

Plots of eight filters showing drift in angstroms vs time in months when kept at or less than 38°C.

Fig. 8
Fig. 8

Plot of drift vs time at 100°C for several months.

Fig. 9
Fig. 9

Curve of drift vs time of a freshly deposited filter at ~100°C. Data furnished by R. J. Bennett, Spectro-Film, Inc.

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