Abstract: A long life laser wavelength meter is based on a Michelson interferometer with a flexure scanner. The scanner has a bar, preferably balanced about a pivot axis defined by a flexural pivot which supports the bar. Retroreflectors are mounted on the bar, equally spaced from the pivot axis. Long life is obtained by cycling or oscillating the bar over a limited range of angular movement within the bending limits of the flexure, which obtains a predicted, essentially infinite cycle life of the flexure. A large optical path length change for each scan of the oscillating bar is obtained through the use of the retroreflectors which fold the optical paths of each arm of the interferometer before reaching a fixed end mirror. The end mirror directs each optical path back through the same set of optical components, including the retroreflectors, to a beamsplitter which combines the light beams from both paths creating an optical interference beam output to a detector.