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  • Radiometers designed to measure the radiant flux (also known as radiant power) of a laser beam in a predetermined spectral range. These instruments typically include a prefilter to filter out the light of a wavelength not in the intended spectral range; a primary detector consisting of a temperature-stabilized, solid-state (e.g., selenium, indium-gallium-arsenide) diode used to detect radiation; electronic circuits, including an amplifier; an electric meter; a power source (e.g., a battery); and a display showing the results in either analog or digital format. Laser beam radiometers are intended for measuring radiant flux in different ranges of the spectrum (e.g., infrared, visible, ultraviolet) within a given power range, accuracy, and resolution; dedicated radiometers used to measure laser beam power in specific ranges (e.g., from 200 to 1,000 nm; from 1,000 to 1,700 nm) are also available. Power (i.e., electromagnetic radiation per unit time) is typically measured in watts, and power density in watt/cm2.
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