Glossary: N

The portion of the electromagnetic spectrum from 700 to 1100nm. Definition may differ by application.

A type of filter that yields a constant attenuation, or optical density, value over a range of wavelengths (i.e. spectrally flat). It is useful for attenuating, or reducing, the amount of light in a system.

Caused by the unwanted spontaneous emission of light from a laser medium resulting in reduced optical performance.

The incident light power required to produce a signal on a detector that is equal to the noise. In this case, the signal-to-noise ratio is equal to one.

Le nombre d’Abbe quantifie inversement la quantité de dispersion dans un milieu optique. Il est donné par une fonction de l'indice de réfraction d'un matériau aux longueurs d'onde f (486,1 nm), d (587,6 nm) et c (656,3 nm). Un matériau ayant un nombre d'Abbe élevé signifie que les différentes longueurs d'onde auront presque le même indice de réfraction dans ce milieu, ce qui donne une séparation moindre entre les longueurs d'onde de la lumière.

A type of beamsplitter that splits the incident light by a specific percentage without altering the polarization state of the transmitted or reflected light.

The maximum downward (compression) load or force that can be applied to a mechanical component perpendicular to the mounting surface. The center of force, or the center of gravity, of the load must be located in the center of the mounting surface.

A type of filter designed to block a pre-selected bandwidth while transmitting all other wavelengths within the design range of the filter. Manufactured using the dielectric stack method, which uses a series of thin layers of dielectric materials of alternating refractive index.

Multiple combinations of wavelength and integer order values that will satisfy any given groove spacing, angle of incidence, and diffracted angle calculated from the grating equation. Gratings are generally specified in terms of first order diffraction since efficiency decreases with higher orders.

The sine of the vertex angle of the largest cone of meridional rays that can enter or exit an optical system. In other words, it governs the amount of light entering or exiting a system. It is inversely related to the f/#.

The theoretical limit of a camera's resolution or sampling ability, defined as the inverse of twice the pixel size.