Use of a YAG:Ne3+ laser in distance measurement by a dispersion method

An experimental investigation was made of a two-wavelength (1.06 and 0.53 μ) range finder utilizing an YAG:Nd laser. When the instrumental error of this refractometric range finder was 0.1 mm, relative changes in the optical path amounting to 10−6 could be detected over a distance of 2 km.