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Very Narrow Band Interference Filters

  • J. V. Ramsay (a1)

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In solar physics a need exists for filters which have very narrow passbands, ~0.01 nm or less. While Lyot-Öhman birefringent filters have been used particularly for investigations at the Hα line, the limited availability of the raw materials, especially calcite, have usually restricted these filters to passbands of ~ 0.025 nm or more. A possible alternative type of filter consists of a number of Fabry-Perot interferometers mounted one behind the other.

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1 Otte, G., J. Sci. Instrum., 42, 911 (1965).
2 Ramsay, J.V., Appl. Optics, 1, 411 (1962).
3 Kobler, H., Proc. IRE Aust., 24, 677 (1963).
4 Ramsay, J. V., Appl. Optics, 5, 1297 (1967).
5 Steel, W. H., ‘Interferometry’, p. 120, University Press, Cambridge, 1967.
6 Ramsay, J. V., ‘Optical Imagery through Fabry-Perot Interferometers’. To be published.

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