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A fresnel is a unit of frequency equal to 10 s. It was occasionally used in the field of spectroscopy, but its use has been superseded by terahertz (with the identical value 10 hertz). It is named for Augustin-Jean Fresnel the physicist whose expertise in optics led to the creation of Fresnel lenses.
References
- Bayliss, Noel S. "The permicron: a unit of wavenumber", Nature, vol. 167, p. 367, 3 March 1951.
- Scientific Unit Conversion: A Practical Guide to Metrication Cardarelli, F. 1999. Springer Science & Business Media. ISBN 9781447108054
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