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A laser pointer or laser pen is a small handheld device with a power source (usually a battery) and a laser diode emitting a very narrow coherent low-powered laser beam of visible light, intended to be used to highlight something of interest by illuminating it with a small bright spot of colored light.

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Laser - Wikipedia

Lasers are distinguished from other light sources by their coherence.Spatial coherence is typically expressed through the output being a narrow beam, which is diffraction-limited.Laser beams can be focused to very tiny spots, achieving a very high irradiance, or they can have very low divergence in order to concentrate their power at a great distance.

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The full width at half-maximum, also called half-power beam width, is measured from the distribution curve of the beam’s intensity along a pre-defined axis, passing through the beam’s center, which is also usually its point of maximum intensity. The FWHM corresponds to the distance between the two points closest to the peak that have 50% of the maximum irradiance or intensity.

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