The photon emitted has a very specific wavelength (color) that depends on the state of the electron's energy when the photon is released. Two identical atoms with electrons in identical states will release photons with identical wavelengths.

In general, the atoms are excited to a level that is two or three levels above the ground state. This increases the degree of population inversion. The population inversion is the number of atoms in the excited state versus the number in ground state.

Once an electron moves to a higher-energy orbit, it eventually wants to return to the ground state. When it does, it releases its energy as a photon — a particle of light.

Although there are many types of lasers, all have certain essential features. In a laser, the lasing medium is “pumped” to get the atoms into an excited state. Typically, very intense flashes of light or electrical discharges pump the lasing medium and create a large collection of excited-state atoms (atoms with higher-energy electrons). It is necessary to have a large collection of atoms in the excited state for the laser to work efficiently.

Helium and helium-neon, HeNe, are the most common gas lasers. They have a primary output of visible red light. CO2 lasers emit energy in the far-infrared, and are used for cutting hard materials.

Anything that produces light — fluorescent lights, gas lanterns, incandescent bulbs — does it through the action of electrons changing orbits and releasing photons.

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Atoms are constantly in motion. They continuously vibrate, move and rotate. Even the atoms that make up the chairs that we sit in are moving around. Solids are actually in motion! Atoms can be in different states of excitation. In other words, they can have different energies. If we apply a lot of energy to an atom, it can leave what is called the ground-state energy level and go to an excited level. The level of excitation depends on the amount of energy that is applied to the atom via heat, light, or electricity.

If this photon (possessing a certain energy and phase) should encounter another atom that has an electron in the same excited state, stimulated emission can occur. The first photon can stimulate or induce atomic emission such that the subsequent emitted photon (from the second atom) vibrates with the same frequency and direction as the incoming photon.

A ruby laser (depicted earlier) is a solid-state laser and emits at a wavelength of 694 nm. Other lasing mediums can be selected based on the desired emission wavelength (see table below), power needed and pulse duration.

A laser is a device that controls the way that energized atoms release photons. "Laser" is an acronym for light amplification by stimulated emission of radiation, which describes very succinctly how a laser works.

Derived from the terms "excited" and "dimers," these types of lasers use reactive gases, such as chlorine and fluorine, mixed with inert gases such as argon, krypton or xenon. When electrically stimulated, a pseudo molecule (dimer) is produced. When lased, the dimer produces light in the ultraviolet range.

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To make these three properties occur takes something called stimulated emission. This does not occur in your ordinary flashlight — in a flashlight, all of the atoms release their photons randomly. In stimulated emission, photon emission is organized.

In other words, if we apply some heat to an atom, we might expect that some of the electrons in the lower-energy orbitals would transition to higher-energy orbitals farther away from the nucleus.This is a highly simplified view of things, but it actually reflects the core idea of how atoms work in terms of lasers.

Solid-state lasers have lasing material distributed in a solid matrix (such as the ruby or neodymium:yttrium-aluminum garnet "Yag" lasers). The neodymium-Yag laser emits infrared light at 1,064 nanometers (nm). A nanometer is 1x10-9 meters.

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Lasers are utilized in industry and research to do many things, including using intense laser light to excite other molecules to observe what happens to them.

There are only about 100 different kinds of atoms in the entire universe. Everything we see is made up of these 100 atoms in an unlimited number of combinations. How these atoms are arranged and bonded together determines whether the atoms make up a cup of water, a piece of metal, or the fizz that comes out of your soda can.

"Star Wars," "Star Trek," "Battlestar Galactica" — laser technology plays a pivotal role in science fiction movies and books. It's no doubt thanks to these sorts of stories that we now associate lasers with futuristic warfare and sleek spaceships.

In this article, you'll learn all about the different types of lasers, their different wavelengths and the uses to which we put them (like laser pointers). But first, let's start with the fundament­als of laser technology by explaining the basics of an atom.

Other lasers, such as diode lasers, are very weak and are used in today’s pocket laser pointers. These lasers typically emit a red beam of light that has a wavelength between 630 nm and 680 nm.

Laser light is monochromatic, meaning it contains only one specific color or wavelength. It is also coherent, with all the photons moving in sync with each other. This coherence gives laser light its focused nature, allowing it to travel over long distances without significant divergence.

Photons, with a very specific wavelength and phase, reflect off the mirrors to travel back and forth through the lasing medium. In the process, they stimulate other electrons to make the downward energy jump and can cause the emission of more photons of the same wavelength and phase.

A ruby laser consists of a flash tube (like you would have on a camera), a ruby rod and two mirrors (one half-silvered). The ruby rod is the lasing medium, and the flash tube pumps it.

Consider the illustration from the previous section. Although more modern views of the atom do not depict discrete orbits for the electrons, it can be useful to think of these orbits as the different energy levels of the atom.

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Once the lasing medium is pumped, it contains a collection of atoms with some electrons sitting in excited levels. The excited electrons have energies greater than the more relaxed electrons. Just as the electron absorbed some amount of energy to reach this excited level, it can also release this energy. The electron can simply relax, and in turn rid itself of some energy. This emitted energy comes in the form of photons (light energy).

Dye lasers use complex organic dyes, such as rhodamine 6G, in liquid solution or suspension as lasing media. They are tunable over a broad range of wavelengths.

Some lasers are very powerful, such as the CO2 laser, which can cut through steel. The CO2 laser is so dangerous is because it emits laser light in the infrared and microwave region of the spectrum. Infrared radiation is heat, and this laser basically melts through whatever it is focused upon.

You see atoms releasing energy as photons all the time. For example, when the heating element in a toaster turns bright red, the red color is caused by atoms, excited by heat, releasing red photons. When you see a picture on a TV screen, what you are seeing is phosphor atoms, excited by high-speed electrons, emitting different colors of light.

Matthew Weschler holds an MS degree in Physical Organic Chemistry from Florida State University. His thesis topic was picosecond laser spectroscopy, and he studied how molecules react picoseconds after being bombarded by laser light.

Lasers are classified into four broad areas depending on the potential for causing biological damage. When you see a laser, it should be labeled with one of these four class designations:

The photon that any atom releases has a certain wavelength that is dependent on the energy difference between the excited state and the ground state.

Laser pointers work through the principles of light amplification and stimulated emission. Inside a laser diode, which is designed to produce a concentrated beam, a process called light amplification occurs. This process involves exciting atoms or molecules, causing them to release photons, which are particles of light. This release of photons is known as stimulated emission, and it creates a synchronized and coherent beam of laser light.

A cascade effect occurs, and soon we have propagated many, many photons of the same wavelength and phase. The mirror at one end of the laser is "half-silvered," meaning it reflects some light and lets some light through. The light that makes it through is the laser light.

This simple atom consists of a nucleus (containing the protons and neutrons) and an electron cloud. It's helpful to think of the electrons in this cloud circling the nucleus in many different orbits.

There are many different types of lasers. The laser medium can be a solid, gas, liquid or semiconductor. Lasers are commonly designated by the type of lasing material employed.

­But lasers play a pivotal role in our everyday lives, too. The fact is, they show up in an amazing range of products and technologies. You'll find them in everything from CD players to dental drills to high-speed metal cutting mac­hines to measuring systems. Tattoo removal, hair replacement, eye surgery — they all use lasers.

But what is a laser? What makes a laser beam different from the beam of a flashlight? Specifically, what makes a laser light different from other kinds of light? How are lasers classified?

Sometimes called diode lasers, these are not solid-state lasers. These electronic devices are generally very small and use low power. They may be built into larger arrays, such as the writing source in some laser printers or CD players.

It's important to note that laser pointers also emit unconverted infrared laser light, which is invisible to the human eye. Manufacturers include filters to block most of this invisible light, but it is essential to handle laser pointers responsibly and avoid pointing them at reflective surfaces or anyone's eyes.