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Colors and wavelengths. Early laser pointers were helium–neon (HeNe) gas lasers and generated laser radiation at 633 nanometers (nm), usually designed to produce a laser beam with an output power under 1 milliwatt (mW). The least expensive laser pointers use a deep-red laser diode near the 650 nm wavelength.
635 nm: AlGaInP better red-laser pointers, same power subjectively twice as bright as 650 nm; 650–660 nm: GaInP/AlGaInP CD and DVD drives, cheap red laser pointers; 670 nm: AlGaInP bar-code readers, first diode-laser pointers (now obsolete, replaced by brighter 650 nm and 671 nm DPSS) Infrared. 760 nm: AlGaInP gas sensing: O 2
Laser pointers in different colours. Many scientific, military, medical and commercial laser applications have been developed since the invention of the laser in 1958. The coherency, high monochromaticity, and ability to reach extremely high powers are all properties which allow for these specialized applications.
DPSSLs have advantages in compactness and efficiency over other types, and high power DPSSLs have replaced ion lasers and flashlamp-pumped lasers in many scientific applications, and are now appearing commonly in green and other color laser pointers.
Carbon dioxide laser: 10.6 μm, (9.4 μm) Transverse (high-power) or longitudinal (low-power) electrical discharge Material processing (laser cutting, laser beam welding, etc.), surgery, dental laser, military lasers. Carbon monoxide laser: 2.6 to 4 μm, 4.8 to 8.3 μm Electrical discharge
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Low to medium power laser diodes are used in laser pointers, laser printers and CD/DVD players. Laser diodes are also frequently used to optically pump other lasers with high efficiency. The highest-power industrial laser diodes, with power of up to 20 kW, are used in industry for cutting and welding. [62]
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