Helium-Neon Laser – Definition, Principle, Construction, Working, Advantages and Disadvantages.
He-Ne laser, also known as Helium-Neon laser, is a type of gas laser that emits red light with a wavelength of 632.8 nm. This laser was invented in 1961 by Ali Javan, William R. Bennett Jr., and Donald Herriott at Bell Telephone Laboratories. He-Ne laser is a gas laser that emits red light having wavelength … Read more