Lamellar grating interferometer

Four of the seven spectra secured with the new lamellar-grating interferometer have a spectral resolution better than 0.5 cm . This resolution allows the detection of a number of stratospheric molecular absorption lines (H2O, O2, O3). 

Figure 5.35. Principle of the lamellar grating interferometer. Radiation reflected from the movable facets travels a distance of Idicos a farther than the radiation reflected from the stationary (shaded) facets.

Figure 5.36. Comparison of the theoretical efficiency of a lamellar grating interferometer (1) and a Michelson interferometer equipped with a metal mesh beamsplitter (2) and a 100-pm PET beamsplitter (3). (Reproduced from [47], by permission of the Optical Society of America copyright 1964.)...

Fig. 5.8.17 Lamellar grating interferometers. The upper panel (A) shows the plane version. The lower panel (B) illustrates the spherical configuration.

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