fluence

American  

[floo-uhns] / ˈflu əns /

noun

plural

fluences

1. Physics. a measure of either the amount of energy or the number of photons or other particles received per unit area of an irradiated surface (often used in a medical context).

2. Optics. a measure of the density of a laser beam, expressed as the amount of radiant energy per unit area delivered to a surface.

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Example Sentences

To improve efficacy and reduce complications from such laser treatment, an Osaka Metropolitan University-led research group has developed an index of the threshold energy density, known as fluence, and the dependent wavelength for picosecond lasers.

From Science Daily • Mar. 27, 2024

GRB170817A had a fluence of 2.2 × 10−7 erg cm−2 in the 10–1,000 keV energy range, as observed by the Fermi-GBM.

From Nature • Oct. 15, 2017

At a distance of 40 Mpc, this fluence corresponds to a γ-ray isotropic equivalent energy Eiso ≈ 4.3 × 1046 erg.

From Nature • Oct. 15, 2017

The atomic oxygen concentration was estimated from the absorption cross section of O at 157 nm and the laser fluence.

From Science Magazine • Dec. 15, 2011

One whose mind can be softened by harmony and whose feelings are so evidently alive to the in fluence of sweet sounds, should not decry the pleasures of virtue.

From The Red Rover by Cooper, James Fenimore