Refractive index measurement of compressed nitrogen using an infrared frequency-domain interferometer

摘要

Frequency-domain interferometry is used to obtain the refractive index of compressed nitrogen in the vicinity of 1550 nm as the pressure of nitrogen increases from 0 to 40 MPa at room temperature. By referring to the equation of state of nitrogen, the relation between the refractive index and the nitrogen density is obtained and the electric polarizability of a nitrogen molecule is thereby determined to be (1.82 +/- 0.15) x 10(-30) m(-3) according to the Lorentz-Lorentz relation. (C) 2018 Elsevier GmbH. All rights reserved.