helium-neon laser

This wavelength is also available, though even more rarely, from a helium-neon laser.

A helium-neon laser like those used in surveying aligns the machine with the target.

The red emission line from neon is also responsible for the well known red light of helium-neon lasers.

Red helium-neon lasers were used commercially in LaserDisc players.

Helium-neon lasers have various applications, including barcode readers.

For example, in the helium-neon laser the electrons from the discharge collide with the helium atoms, exciting them.

The helium-neon laser beam is split allowing one part of the beam to pass near/through the device being tested.

In contrast to helium-neon lasers, the laser diode technology was safer, smaller, more rugged and featured a longer life.

These applications include measuring specific viscosity of a liquid placed between a polarizer and an analyzer, illuminated by a helium-neon laser.

The helium-neon laser also has a bottleneck as one decay step needs the walls of the cavity and this laser typically runs in continuous mode.

Deathlok also carried a helium-neon laser pistol designed by the U.S. Army of his time, and a throwing dagger.

The early Laserdisc players used a Helium-Neon laser to read the disc, but the later models used infrared lasers.

Helium is used in helium-neon lasers and in some thyratrons rated for high currents and high voltages.

To read the cylinder, the helium-neon laser beam bounces off the hills and dales in the grooves of the cylinder, which alters the frequency.

For the most precise work in mass metrology, g is measured using dropping-mass absolute gravimeters that contain an iodine-stabilized helium-neon laser interferometer.

Prior to the laser diode scanner, bar code scanners were built with helium-neon lasers that came in 6" tubes that could be explosive.

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.

Neon is used in vacuum tubes, high-voltage indicators, lightning arrestors, wave meter tubes, television tubes, and helium-neon lasers.

The shortcomings of the krypton standard were demonstrated by the measurement of the wavelength of the light from a methane-stabilized helium-neon laser (λ 3.39 m).

Then in 1975, after breakthroughs in bar coding technology, Metrologic Instruments developed the world's first hand-held helium-neon laser bar code scanner.

Current models utilize a red helium-neon laser, red laser diodes or even red LEDs (light-emitting diodes).

To further facilitate reproducibility from lab to lab, the 17th CGPM also made the iodine-stabilised helium-neon laser "a recommended radiation" for realising the metre.

Although these helium-neon laser scanners sped up the checkout process somewhat, they were heavy, generated a great deal of heat and had short life spans because the tubes broke frequently.

Thus, the "pencil beam" directly generated by a common helium-neon laser would spread out to a size of perhaps 500 kilometers when shone on the Moon (from the distance of the earth).

F.D.A. approval is being sought by the Dynatronics Laser Corporation of Salt Lake City to sell a helium-neon laser for pain therapy and wound healing.