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We present an accurate determination of the refractive index of hydrogen,helium, H2O and neon up to 35 GPa at ambient temperature. The experimentalmethod is based on the combination of two interferometric signals of theFabry-Perot cavity containing the sample in the diamond anvil cell. The dataare put in perspective through the variation of the molecular polarisabilitywith density. Significant electronic changes are observed. Interestingpossibilities of the method are also illustrated: the high precision to finelyprobe phase transition; the simultaneous measurement of the volume to obtainthe equation of state of transparent media with around 1 % accuracy.Comment: 10 pages, 10 figures, accepted jan. 03 in Phys. Rev.

physical review. b, condensed matter

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Measurement of refractive index and equation of state in dense He,H2,H2