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Science 25 December 1964:
Vol. 146. no. 3652, pp. 1672 - 1673
DOI: 10.1126/science.146.3652.1672
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Articles

Accurate Length Measurement of Meter Bar with Helium-Neon Laser

K. D. Mielenz 1, H. D. Cook 1, K. E. Gillilland 1, and R. B. Stephens 1

1 National Bureau of Standards, Washington 25, D.C.

A helium-neon gas laser has been successfully used in conjunction with an automatic fringe-counting interferometer to measure the length of a meter bar. The agreement obtained was 7 parts in 100 million with respect to the assigned length of the bar.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Lasers.
A. L. Schawlow (1965)
Science 149, 13-22
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Science. ISSN 0036-8075 (print), 1095-9203 (online)