An acronym of Light Amplification by Stimulated Emission of Radiation. A laser produces an intense beam of monochromatic, coherent light. Includes Gas, Solid State, Excimer, Ion, and Dye types.

Alignment Lasers are lasers that create an extremely accurate reference point, line, or shape for aligning machines in industrial processes.
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Carbon dioxide (CO2) lasers use the energy-state transitions between vibrational and rotational states of CO2 molecules to emit at long IR, about 10 µm, wavelengths. These lasers can maintain continuous and very high levels of power and are typically used in cutting, welding, etching, and marking applications.
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Diode lasers use light-emitting diodes to produce stimulated emissions in the form of coherent light output. They are also known as laser diodes.
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Dye lasers use a dye solution as an active medium. Their output is a short pulse of broad spectrum content with a high achievable gain.
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Excimer lasers are rare-gas halide or rare-gas metal vapor lasers that produce relatively wide beams of ultraviolet laser light. They operate via the electronic transitions of molecules.
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Fiber lasers use optical fibers doped with low levels of rare-earth halides as the lasing medium to amplify light.
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Helium cadmium (HeCd) lasers are relatively economical, continuous-wave sources for violet (442 nm) and ultraviolet (325 nm) output. They are used for 3-D stereolithography applications, as well as for exposing holographs.
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Helium neon (HeNe) lasers have an emission that is determined by neon atoms by virtue of a resonant transfer of excitation of helium. They operate continuously in the red, infrared and far-infrared regions and emit highly monochromatic radiation.
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Ion lasers function by stimulating the emission of radiation between two levels of an ionized gas. They provide moderate to high continuous-wave output of typically 1 mW to 10 W.
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Laser mounts are devices that keep a laser in position on an optical table.
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Laser pointers are compact instruments that produce a low-power, visible laser light. They are often used for pointing out features on a projected visual display.
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Lasers are devices that produce intense beams of monochromatic, coherent radiation. The word "laser" is an acronym for Light Amplification by Stimulated Emission of Radiation.
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Nitrogen lasers are an excellent source of high intensity, short pulse, ultraviolet radiation. They can be used as an excitation source, or as a pump for a dye laser.
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Solid state lasers use a transparent substance (crystalline or glass) as the active medium, doped to provide the energy states necessary for lasing.  Solid state lasers are used in both low and high power applications.
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