... implementation

Appendix A is only available in electronic form at http://www.edpsciences.org

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... photons

Expressed as the number of photons per unit frequency interval, confined to a unit solid angle about any direction, crossing a unit area normal to this direction in unit time.

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... irradiance

$I(\omega)$ is the magnitude of the Poynting vector of the incident field; its dimensions are energy per unit area and unit time.

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