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11 terms
Photonics Dictionary: Q
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optical x
Q x
quasi-optical
Having properties resembling those of light- waves; e.g., the propagation of waves in the television spectrum.
Q
The figure of merit of a resonator, defined as (2p) x (average energy stored in the resonator)/(energy dissipated per cycle). The higher the reflectivity of the surfaces of an optical resonator, the...
Q-switch
A device used to rapidly change the Q of an optical resonator. It is used in the optical resonator of a laser to prevent lasing action until a high level of inversion (optical gain and energy...
quadratic profile
->
parabolic profile
The condition in which the index of refraction in an optical fiber varies as a parabolic function of the radius.
quantitative phase imaging
Quantitative phase imaging (QPI) is an advanced imaging technique used in microscopy to measure and analyze the optical phase information of transparent specimens. Unlike traditional brightfield...
quantum cascade laser
A quantum cascade laser (QCL) is a type of semiconductor laser that operates based on the principles of quantum mechanics. It is a versatile and powerful device used for emitting coherent light in...
quantum confinement
Quantum confinement refers to the phenomenon in quantum mechanics where the motion of charge carriers, such as electrons or holes, is restricted to a region of space that is smaller than their...
quantum noise
Noise generated within an optical communications system link that has both internal (dark current) and external (background noise, or noise in signal) components.
quantum photodetector
->
photodetector
A photodetector, also known as a photosensor or photodiode, is a device that detects and converts light into an electrical signal. Photodetectors are widely used in various applications, ranging from...
quantum well
A quantum well is a structure in quantum mechanics that confines particles, such as electrons or holes, in one spatial dimension. This confinement leads to quantized energy levels, creating a...
QWOT
quarterwave optical thickness
Photonics Dictionary
Q
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