From Wikipedia, the free encyclopedia

Quantity Unit Dimension Notes
Name Symbol [nb 1] Name Symbol
Photon energy n 1 count of photons n with energy Qp = hc. [nb 2]
Photon flux Φq count per second s−1 T−1 photons per unit time, dn/d t with n = photon number.
also called photon power.
Photon intensity I count per steradian per second sr−1⋅s−1 T−1 dn/d ω
Photon radiance Lq count per square metre per steradian per second m−2⋅sr−1⋅s−1 L−2T−1 d2n/(d A cos(θ) dω)
Photon irradiance Eq count per square metre per second m−2⋅s−1 L−2T−1 dn/dA
Photon exitance M count per square metre per second m−2⋅s−1 L−2T−1 dn/dA
See also:
  1. ^ Standards organizations recommend that photon quantities be denoted with a suffix " q" (for "quantum") to avoid confusion with radiometric and photometric quantities.
  2. ^ The energy of a single photon at wavelength λ is Qp = h⋅c/λ with h = Planck's constant and c = velocity of light.


From Wikipedia, the free encyclopedia

Quantity Unit Dimension Notes
Name Symbol [nb 1] Name Symbol
Photon energy n 1 count of photons n with energy Qp = hc. [nb 2]
Photon flux Φq count per second s−1 T−1 photons per unit time, dn/d t with n = photon number.
also called photon power.
Photon intensity I count per steradian per second sr−1⋅s−1 T−1 dn/d ω
Photon radiance Lq count per square metre per steradian per second m−2⋅sr−1⋅s−1 L−2T−1 d2n/(d A cos(θ) dω)
Photon irradiance Eq count per square metre per second m−2⋅s−1 L−2T−1 dn/dA
Photon exitance M count per square metre per second m−2⋅s−1 L−2T−1 dn/dA
See also:
  1. ^ Standards organizations recommend that photon quantities be denoted with a suffix " q" (for "quantum") to avoid confusion with radiometric and photometric quantities.
  2. ^ The energy of a single photon at wavelength λ is Qp = h⋅c/λ with h = Planck's constant and c = velocity of light.



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