The gas laser was the first continuous-light laser and the first continuous wave laser pdf to operate on the principle of converting electrical energy to a laser light output. It produced a coherent light beam in the infrared region of the spectrum at 1. Gas lasers using many gases have been built and used for many purposes.
6 µm, and are often used in industry for cutting and welding. CO” lasers have the potential for very large outputs, but the use of this type of laser is limited by the toxicity of carbon monoxide gas. Human operators must be protected from this deadly gas. Furthermore, it is extremely corrosive to many materials including seals, gaskets, etc. 160 different wavelengths by adjusting the cavity Q to peak at the desired wavelength. Units operating at 633 nm are very common in schools and laboratories because of their low cost and near perfect beam qualities. 1 nm, using molecular nitrogen as its gain medium, pumped by an electrical discharge.
The acronym “TEA” stands for Transversely Excited Atmospheric. Chemical lasers are powered by a chemical reaction permitting a large amount of energy to be released quickly. Depending on the optics and the laser tube a different number of lines is usable but the most commonly used lines are 458 nm, 488 nm and 514. He-Ne laser is mainly used in making holograms. In laser printing He-Ne laser is used as a source for writing on the photosensitive material. He-Ne lasers were used in reading the Bar Code which is imprinted on the product. Nitrogen lasers and excimer laser are used in pulsed dye laser pumping.