Abstract

A high resolution Littrow type grating spectrometer designed for four-pass operation in the near ir is described. Using 20-cm gratings, four passed in first and second orders, this instrument achieves a spectral resolution between 0.015 cm−1 and 0.025 cm−1 in the 1.9-μ to 3.6-μ region. This resolution is up to 40% better than that realized with the same system double passed.

© 1967 Optical Society of America

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