For studying the spectrum of weak extended sources in the 1–2-μm wavelength region, a phase grid-type interferntial spectrometer was made. Its principle consists of decoding by a phase grid a Fourier interferogram localized out of an appropriated plane-wave interferometer. Its description (resolving power is ≈30,000), a comparison with other interferential spectrometers, and first experimental results are given.
© 1983 Optical Society of America
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