Definition of principal axis

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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers

Photonics Dictionary

principal axis: A straight line connecting the curvature centers of the refracting lens surfaces. In a mechanical sense, a line joining the centers of a lens as it is placed in a mount. The principal axis is the optical axis of a lens.

Hamamatsu Corp. - Mid-Infrared LED 11/24 MR

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