Application of laser wavelength standard to interferometry measurements in air with nanometric accuracy

This paper presents a comparison between interferometric heterodyne measurements of a commercial system (Axiom 2/20, Zygo) with its frequency stabilized He-Ne laser source and the same apparatus whose laser source has been replaced by our wavelength stabilized laser diode. The aim of this paper is only to demonstrate the feasibility of length measurements by interferometric techniques using new type of laser source which is insensitive to fluctuations of the refractive index of air.