Editing Red (section)

=== Lasers ===
[[Laser]]s 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,<ref>{{Cite journal|last1=White|first1=A. D.|last2=Rigden |first2=J. D.|date=1962 |title=Continuous Gas Maser Operation in the Visible|journal=Proc. IRE|volume=50 |pages=1697}} US Patent 3242439.</ref> 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 diode]]s became widespread with the commercial success of modern [[DVD]] players, which use a 660&nbsp;nm laser diode technology. Today, red and red-orange laser diodes are widely available to the public in the form of extremely inexpensive [[laser pointer]]s. Portable, high-powered versions are also available for various applications.<ref name="laserglow">{{cite web |url=http://www.laserglow.com/GRH|title=Laserglow – Blue, Red, Yellow, Green Lasers|website=Laserglow.com|archive-url=https://web.archive.org/web/20110805054301/https://www.laserglow.com/GRH|archive-date=August 5, 2011|url-status=dead|access-date=Sep 20, 2011}}</ref> More recently, 671&nbsp;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.<ref name="laserglow2">{{cite web |url=http://www.laserglow.com/GRH |title=Laserglow&nbsp;– Lab/OEM Lasers |publisher=Laserglow.com |access-date=2011-09-20 |archive-url=https://web.archive.org/web/20110915034320/http://www.laserglow.com/GRH |archive-date=2011-09-15 |url-status=live }}</ref>

Red's wavelength has been an important factor in laser technologies; red lasers, used in early [[compact disc]] technologies, are being replaced by blue lasers, as red's longer wavelength causes the laser's recordings to take up more space on the disc than would blue-laser recordings.<ref>{{Cite web|url=http://www.usbyte.com/common/dvd_7.htm |access-date=Nov 23, 2018|title=DVD |website=usbyte.com |publisher=eMag Solutions LLC|url-status=dead|archive-url= https://web.archive.org/web/20100106063624/http://www.usbyte.com/common/dvd_7.htm|archive-date=January 6, 2010}}</ref>