Glossary

Angle of Diffraction

The angle at which light is diffracted from a grating. Measured from normal incidence to the grating surface

Angle of Incidence

The angle at which light enters a grating. Measured from normal incidence to the grating surface

AOD

Angle of Diffraction

AOI

Angle of Incidence

Bandwidth

The useful wavelength range of a grating, spectrometer, or system

Center Wavelength

The wavelength for which a grating is designed to operate at peak efficiency

CWL

Center Wavelength

OCT

Optical Coherence Tomography

Optical Coherence Tomography

An imaged technique that uses light to capture micrometer-resolution images from light interference within optical scattering media

p- polarized Light

Light that oscillates parallel to the plane of incidence

PDL

Polarized Dependent Loss

Polarization Dependent Loss

Losses that vary, in an optical component, at different states of polarization. The difference is expressed in decibels between the maximum and minimum loss

Raman Shift

A change in frequency undergone by monochromatic light scattered by the molecules of substance whose characteristics determine the amount of change

Raman Spectroscopy

A spectroscopic technique used to observe vibrational, rotational, and other low-frequency modes in a system.

Raman Wavenumber

Raman shifts are typically reported in wavenumbers, which have units of inverse length as this value is directly related to excitation wavelength

s- polarized Light

Light that oscillates perpendicular to the plane of incidence

Spatial Frequency

A characteristic of any structure that is periodic across position in space such as the line spacing in surface relief grating or the fringe spacing in a volume phase grating

SRG

Surface Relief Grating

Surface Relief Grating

A grating whose structure is machined or etched onto the surface of grating medium or substrate

Volume Phase Grating

A grating whose structure is in the volume of the medium. The grating is formed by periodic differences in the index of refraction in the medium

Volume Phase Holographic Grating

A volume phase grating written using holographic techniques

VPG

Volume Phase Grating

VPHG

Volume Phase Holographic Grating

Wavelength

The distance between successive crests of a wave such as an electromagnetic wave or light

Wavenumber

The spatial frequency of a wave, either in cycles per unit distance or radians per unit distance