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Measurement of the group refractive index of air by two-wavelength interferometry |
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| Authors: | Hirokazu Matsumoto |
| Affiliation: | National Research Laboratory of Metrology, 1-1-4 Umezono Sakura-mura, Niihari-gun, Ibaraki 305, Japan |
| Abstract: | The group refractive index of air at 3.44 μm is directly measured with an accuracy of 2 × 10-7 using two-wavelength simultaneous interferometry with a 3.51- and 3.37-μm simultaneous operation He-Xe laser. |
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