SYMBOLS AND UNITS

Roman Symbols and Acronyms

a = Radius of an aperture or fiber [m]; also, Radius of a spherical scattering particle [m]; also, Radius of a circle [m]; also, Distance between locations [m]; also, Lattice constant [m]; also, Length of a thin metallic rod [m]; also, Chirp parameter for an optical pulse

a0 = Bohr radius (radius of ground state of Bohr hydrogen atom; a0 ≈ 0.53 Å) [m]

α = Complex amplitude or magnitude of an optical wave; also, Normalized complex amplitude of an optical field (|α|2 = photon-flux density)

a = Normalized field amplitude in a cavity (|a|2 = field energy in units of photon number)

a = Acceleration of a carrier [m · s−2]

a = Primitive vector defining a lattice unit cell [m]

a = Complex-amplitude vector

A = Complex envelope of a monochromatic plane wave; also, Pulse amplitude

A(r) = Complex envelope of a monochromatic wave

A(ν) = Fourier transform of the complex envelope of an optical pulse

A = Complex vector envelope of a monochromatic plane wave; also, Vector potential [V·s·m−1]

𝒜 = Absorbance

𝒜(r, t)= Complex envelope of a polychromatic (e.g., pulsed) wave

𝒜(t)= Complex envelope of an optical pulse

A = Area [m2]; also, Element of the ABCD ray-transfer and wave-transfer matrices M

Ac = Coherence area [m2]

Aij = Element of Jacobian transformation matrix

Ar = Relative atomic mass

Ai = Airy function

A = Jacobian transformation matrix

𝔸 = ...

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