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The active laser medium (also called a gain medium or lasing medium) is the source of optical gain within a laser. The gain results from the stimulated emission of photons through electronic or molecular transitions to a lower energy state from a higher energy state previously populated by a pump source .
The active laser medium (laser gain/amplification medium) is a synthetic ruby rod that is energized through optical pumping, typically by a xenon flashtube. Ruby has very broad and powerful absorption bands in the visual spectrum, at 400 and 550 nm, and a very long fluorescence lifetime of 3 milliseconds.
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Laser in original colours, as delivered in the 1970s Sailor hiking out on a Laser Radial. The ILCA is manufactured by a number of different companies. As of April 2023 these were Devoti Sailing s.r.o., Czech Republic, Element 6 Evolution Co., Ltd., Thailand, Far East Boats, P. R. China, Nautivela srl, Italy, Ovington Boats Ltd, Great Britain, Performance Sailcraft Australia, Performance ...
Laser types with distinct laser lines are shown above the wavelength bar, while below are shown lasers that can emit in a wavelength range. The height of the lines and bars gives an indication of the maximal power/pulse energy commercially available, while the color codifies the type of laser material (see the figure description for details).
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In adults and children age 2 and older, use it only on the neck and chest to ease coughing during a cold, per the Mayo Clinic. Vicks VapoRub is made of ingredients such as camphor, eucalyptus oil ...