Define Beam Divergence of a Gaussian Laser Beam.
In simple terms, it describes how much the laser beam expands over distance. When a laser beam is emitted, it typically has a narrow and concentrated shape, like a tight beam. However, due to natural physical properties, the beam starts to gradually spread out as it travels away from its source. The measure of beam divergence quantifies this spreading effect and indicates how quickly the laser beam expands.
A low beam divergence means the beam remains tightly focused over longer distances, while a high beam divergence indicates a more significant spreading of the beam.
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