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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 15, Iss. 11 — Nov. 1, 1976
  • pp: 2736–2745

Filters for ν2 band of CO2: monitoring and control of layer deposition

C. S. Evans, R. Hunneman, J. S. Seeley, and A. Whatley  »View Author Affiliations


Applied Optics, Vol. 15, Issue 11, pp. 2736-2745 (1976)
http://dx.doi.org/10.1364/AO.15.002736


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Abstract

Two types of multilayer interference filter are required for temperature sounding the earth’s atmosphere. In relation to the 668-cm−1ν2 band of CO2 these are narrowband (4 cm−1 wide for the Q branch, 10 cm−1 for the R branch) or isolation (~60 cm−1 wide for the complete center of the band). Difficulty in manufacturing the filters for nimbus-SCR and -PMR spaceflight has indicated a need for improvement in the monitoring and control of the deposition of layers, and the paper describes a realization of this. The consequent effect on filter performance (utilizing a particular combination of layer materials) is described.

© 1976 Optical Society of America

History
Original Manuscript: October 23, 1975
Published: November 1, 1976

Citation
C. S. Evans, R. Hunneman, J. S. Seeley, and A. Whatley, "Filters for ν2 band of CO2: monitoring and control of layer deposition," Appl. Opt. 15, 2736-2745 (1976)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-15-11-2736


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References

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  12. Monitored = measured in reflection during deposition, spectrally resolved for deduction of optical thickness.
  13. Technicolour Motion Picture Corp.: British Patent731,865 (1955).
  14. To be published in Opt. Acta231976.
  15. For compensation of Te lost from PbTe during evaporation and again during deposition; solves the problem of transparency at long wavelengths.16
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  18. S. D. Smith, G. Peckham, “Specification of optical components for NIMBUS-4 and 5 SCR (1967, 1969)” (Department of Physics, Heriot-Watt University) (formerly of Reading University), otherwise unpublished.
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  21. The empirical deduction relating to this is that excess dwell time is best avoided for the filter substrates when depositing ZnS, such dwell time being apparently on otherwise source of greater inaccuracy than are fractions.
  22. The empirical deduction relating to this is that inner vs outer identity may take precedence over a complete in situ record when unquantifiable effects are present in the particular case of DHW symmetry.
  23. Lowpass = low (wavenumber) pass, highpass = high (wavenumber) pass.
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  25. C. S. Evans, R. Hunneman, J. S. Seeley, J. Phys. D. 9, 309 (1976). [CrossRef]
  26. Lowpass photoconductive absorption above 2650 cm−1 in PbTe; highpass reststrahlen lattice vibrational absorption variously in the II–VI compounds, being located at 310 cm−1 in the example of ZnS.
  27. H. Roscoe et al., “Specification of optical components for balloon flight PMR etc.” (1974, 1975) (Department of Atmospheric Physics, University of Oxford) otherwise unpublished.
  28. K. H. Davies, J. T. Houghton, G. D. Peskett, “Specification of optical components for NIMBUS-6 PMR” (1972) (Department of Atmospheric Physics, University of Oxford), otherwise unpublished.

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