Abstract

The Fabry-Perot interferometer has been adapted for very high-resolution spectroscopy in the near infrared. At 1.5 microns a pair of lines separated by 0.043 cm−1 was fully resolved. It is explained that this represents a sixfold improvement over anything that has been achieved hitherto at this wavelength. An important new method emerged which has applications to both emission and absorption spectroscopy in general. By its means a region many times the spectral range of the interferometer can be displayed directly and unambiguously without overlapping orders.

© 1955 Optical Society of America

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