Abstract
The wavelength of a helium-neon gas laser was determined using a Michelson interferometer by relating mirror displacement to interference fringe shifts. As the movable mirror was displaced, the number of fringe shifts m was counted and the corresponding mirror displacement d was recorded. Plotting d as a function of m revealed a linear relationship, where the slope corresponds to half the wavelength of the light. Using this result, the wavelength was determined to be 653(6)nm.
