Bell and the first gas-ion laser, 1964

Bell and the first gas-ion laser, 1964

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Caption: Bell and the first gas-ion laser, 1964. Operating the laser is Canadian physicist William Earl Bell (1921-1991). The apparatus used mercury and produced a green laser line at 5145 angstrom wavelength. The acronym LASER stands for 'light amplification by stimulated emission of radiation'. The laser was developed in 1960 and laser technology is now used in many different areas, including medicine, telecommunications, the military, industry, and scientific research. There are thousands of types of laser, differing by the wavelength and methods used to produce the laser beam. Photographed at Spectra Physics Corporation, California, USA.Restrictions:

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