The Iodine Stabilized Laser As A Realization Of The Length Unit

Howard P. Layer

doi:10.1117/12.956008

28 February 1978 The Iodine Stabilized Laser As A Realization Of The Length Unit

Howard P. Layer

Proceedings Volume 0129, Effective Utilization of Optics in Quality Assurance I; (1978) https://doi.org/10.1117/12.956008
Event: Effective Utilization of Optics in Quality Assurance, 1977, Arlington Heights, United States

Abstract

The iodine stabilized helium-neon laser is the most accurate and stable standard of length that is available for general metrological use today. Although the krypton discharge lamp is still the basis for international agreements which define the meter as the length standard, the independent reproducibility of the iodine stabilized helium-neon laser has been shown to exceed that of the krypton lamp when international intercomparisons are made. Because of its superior performance, the iodine stabilized helium-neon laser is used in most national standards laboratories to realize the standard of length. A value for its wavelength which is consistent with the value for the wavelength of the krypton lamp has been agreed upon by the metrological community through consultation with the International Bureau of Weights and Measures.

Citation Download Citation

Howard P. Layer "The Iodine Stabilized Laser As A Realization Of The Length Unit", Proc. SPIE 0129, Effective Utilization of Optics in Quality Assurance I, (28 February 1978); https://doi.org/10.1117/12.956008

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