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- W2051568830 abstract "IN a recent communication, Hartley1 indicated a simple arrangement for realizing phase-contrast in polarized light. It consisted of a quarter-wave plate cut in two and reassembled after 90° rotation, so that the dioptric rays and the diffracted rays, crossing respectively the two parts of the plate, are changed in phase with respect to each other. This same method was indicated by one of us2 at the international conference of the Institut d‘Optique, Paris, held in October 1946, and its efficiency has been tested since by experiment. We tested also another design which has the advantage of giving the exact phase-change needed and independently permits the weakening of the dioptric rays in a continuous manner so that it can be adjusted to optimum intensity. (In the last paragraph of his letter in Nature, Hartley indicated a modification of his design in order to obtain also the weakening of the dioptric rays; in doing so, however, the correct phase retardation given by his first arrangement is lost.)" @default.
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- W2051568830 date "1948-03-01" @default.
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- W2051568830 title "Phase-Contrast in Polarized Light" @default.
- W2051568830 cites W1967946048 @default.
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- W2051568830 doi "https://doi.org/10.1038/161357a0" @default.
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