optical axis

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optical axis

In a lens element, the straight line which passes through the centers of curvature of the lens surfaces. In an optical system, the line formed by the coinciding principal axes of the series of optical elements.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
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References in periodicals archive ?
Bearing in mind this possible realization of such an inhomogeneous metamaterial, further we demonstrate considerable enhancement of the radiation absorption in the film with spatially varying orientation of the optical axes. As before, we use in analysis the effective medium approximation.
The crystal plates have orthogonal orientation of the optical axes. The main section of the first crystal plate is oriented at an angle of 45[degrees] to the plane of the polarizer's transmission.
The optical axes of these materials always roughly align with the morphological characteristics of the sample, which is why the [alpha], [beta], and [gamma] axes were chosen instead of the typical [n.sub.a], [n.sub.b], and [n.sub.c] axes found in similar papers.
Often several telecameras must be located in the zone of works with different orientation of their optical axes or the used telecamera must have capability to move in space and to change its orientation.
* Collimation: Aligning two optical axes so they are parallel, or aligning the optical axis of an instrument with its physical axis (as when zeroing a rifle with an optical collimator or checking barrel alignment on a binocular).
The explosion of optical fiber-based infrastructure demands accurate micro-motors and adjustment devices to allow for physical alignment of optical axes with lasers and fiber-to-fiber connections.