A Modified Form of the Christiansen Filter


THE great shortcoming of the Christiansen filter1 is that, in principle, it is transparent for all wave-lengths. Every wave-length, after having passed through the filter, has its maximum intensity in the direction of the incident light. Although it is possible to construct a Christiansen monochromator in which the width, in wave-lengths, between the points on each side of the transmitted band at which the intensity is reduced to one-half, or even one-tenth, is small, the corresponding distance for the reduction of intensity to one-thousandth is of considerable size.

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  1. 1

    Cf., for example, McAlister, Smithsonian Misc. Coll., 93, No. 7 (1935).

  2. 2

    Berger og Klemm, Zeiss Nachrichten, 2 Folge, Heft 2 (1936).

  3. 3

    Geffcken, Kolloid-Z., 86, 55 (1939).

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CARLSEN, T. A Modified Form of the Christiansen Filter. Nature 165, 611 (1950) doi:10.1038/165611a0

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