Definition of photon

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PowerPhotonic Ltd. - Bessel Beam Generator LB 6/24

Photonics Dictionary

photon: A quantum of electromagnetic energy of a single mode; i.e., a single wavelength, direction and polarization. As a unit of energy, each photon equals hn, h being Planck's constant and n, the frequency of the propagating electromagnetic wave. The momentum of the photon in the direction of propagation is hn/c, c being the speed of light.

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