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Photonics Dictionary

linewidth

Linewidth, also known as spectral linewidth or line width, refers to a measure of the width of a frequency spectrum of a signal or a resonance. It indicates the range of frequencies over which the signal or resonance is spread or distributed.

In the context of signals, linewidth typically refers to the range of frequencies present in the signal, which can be determined by analyzing its Fourier transform. A signal with a narrow linewidth is characterized by having most of its power concentrated within a small frequency range, while a signal with a wide linewidth has power spread across a broader frequency range.

In the context of resonances, such as those observed in optical, acoustic, or electromagnetic systems, linewidth refers to the width of the peak in the frequency domain corresponding to the resonance. It provides information about the range of frequencies over which the resonance occurs and is often used to characterize the damping or lifetime of the resonance.

In various fields such as optics, telecommunications, spectroscopy, and radar, linewidth is an important parameter that affects the performance and behavior of systems and devices. It can be influenced by factors such as the intrinsic properties of the signal source or resonance, environmental conditions, and external perturbations.
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