Abstract
IN a previous communication1, we gave some measurements of the performance of multilayer dielectric interference filters in the wave-length range 4000–4600 A. We are grateful to M. P. Giacomo for first pointing out that, in deducing from our results the properties of dielectric reflecting films, we failed to take into account the variation of phase change with wave-length, which has been treated by Dufour2. His results show that in our case the filters should have been considered not as of first order, but as of order 2.45. Our values of the reflexion, transmission and absorption coefficients for seven-layer reflecting films of cryolite and zinc sulphide on glass are then as in the table.
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References
Ring, J., and Wilcock, W. L., Nature, 171, 648 (1953).
Dufour, C., Revue d'Optique, 31, 1 (1952).
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RING, J., WILCOCK, W. Multilayer Dielectric Reflecting Films at Wave-lengths between 4000 and 4600 A.. Nature 173, 994 (1954). https://doi.org/10.1038/173994a0
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DOI: https://doi.org/10.1038/173994a0
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