In
optics, the term optical axis is used to define a direction along which there is some degree of
rotational symmetry. It can be used in several contexts:In an
optical system, the optical axis is an imaginary line that defines the path along which light propagates through the system. For a system composed of simple
lenses and
mirrors, the axis passes through the center of curvature of each surface, and coincides with the axis of
rotational symmetry. The optical axis is often coincident with the system's mechanical axis, but not always, as in the case of
off-axis optical systems.In an uniaxial
birefringent material, the optical axis is the axis of optical anisotropy.For an
optical fiber, the optical axis is along the center of the fiber core, and is also known as the fiber axis.
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The longitudinal center of symmetry of an
optical fiber, i.e., the locus of points that are determined by the centers of mechanical symmetry of the outside diameters of fiber cross sections sampled continuously along the length of the fiber.
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