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DataRay Inc. - ISO 11146-Compliant Laser Beam Profilers
Photonics Dictionary

linewidth

1. The range of frequencies or wavelengths over which radiations are absorbed or emitted in a transition between a specific pair of atomic energy levels. The full width is determined between half-power points of the line. 2. In a laser, the range of frequencies over which most of the beam energy is distributed.
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