Red
Lasers emitting in the red region of the spectrum have been available since the invention of the ruby laser in 1960. In 1962 the red helium-neon laser was invented, and these two types of lasers were widely used in many scientific applications including holography, and in education. Red helium-neon lasers were used commercially in LaserDisc players. The use of red laser diodes became widespread with the commercial success of modern DVD players, which use a 660 nm laser diode technology. Today, red and red-orange laser diodes are widely available to the public in the form of extremely inexpensive laser pointers. Portable, high-powered versions are also available for various applications. More recently, 671 nm diode-pumped solid state (DPSS) lasers have been introduced to the market for all-DPSS laser display systems, particle image velocimetry, Raman spectroscopy, and holography.
In what year did a red helium-neon laser come to be?
1962
In 1962 the red helium-neon laser was invented, and these two types of lasers were widely used in many scientific applications including holography, and in education.
Red