Abstract

A novel two-wavelength one-path nonlinear interferometer is used to measure refractive-index dispersion for a number of molecular gases. Δ<i>n</i><sup>3ω</sup>, is measured directly, where Δ<i>n</i><sup>3ω</sup> = <i>n</i><sup>3ω</sup> - <i>n</i><sup>ω</sup> with ω = 2πc/694 nm. Δ<i>n</i><sup>2ω</sup> was measured for these gases previously. For CH<sub>4</sub>, the results are consistent with conventional refractive-index data from the literature; for CHF<sub>3</sub>, CH<sub>3</sub>F, CF<sub>4</sub>, and SF<sub>6</sub>, these results improve refractive-index data for wavelengths shorter than 400 nm; and, for CH<sub>2</sub>F<sub>2</sub>, these results provide the only data on dispersion available to our knowledge.

© 1983 Optical Society of America

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