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A Simulated Channel Spectrum

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Abstract

In order to obtain the highest accuracy in interferometric wavelength measurements with energy integrating devices, the theory of the Fabry-Perot interferometer must be extended. In this paper the portion of the theory dealing with the integrated energy in the part of the Fabry-Perot ring system virtually intercepted by a slit of finite length is presented. We are assuming that the interferometer is placed in parallel light and an infinitely narrow band of wavelengths is used. For this situation, it is shown how the order at the center of the ring pattern corresponding to maximum and minimum energies respectively varies with slit height. The contrast is then determined as a function of slit height. The experimental methods for measuring these quantities are described and the results compared with theory. The theory is also extended to the case of an actual channel spectrum where a finite band of wavelengths is present.

© 1955 Optical Society of America

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