RAMSEY FRINGES USING TRANSITIONS IN THE VISIBLE AND 10 µm SPECTRAL REGIONS : EXPERIMENTAL METHODS Ch. Salomon, Ch. Bréant, Ch. J. Bordé et R. L. BargerJ. Phys. Colloques, 42 C8 (1981) C8-3-C8-14DOI: https://doi.org/10.1051/jphyscol:1981801