A laser makes a bright beam of light.
It uses gas to work. Electricity goes through the gas. This makes the light shine. It helps us do many things. It can even help make pictures.
Do you like bright lights?
A gas laser uses gas to make light.
An electric current goes through the gas. This makes the light shine.
Some lasers use gas to cut metal. These are very strong. Other lasers help doctors with eye surgery.
One kind of laser makes special pictures. These are called holograms. Other lasers can read barcodes on things in a store.
Some lasers use a chemical reaction for power. These can be very powerful. They release a lot of energy fast.
Many different gases can be used. This makes many kinds of lasers. They help us in many ways.
A gas laser makes light using gas.
It works by sending electricity through the gas. This changes the gas to make a beam of light.
The first gas laser was made in 1960. Ali Javan and William R. Bennett, Jr. built it. This was a helium-neon laser. It made light that humans could not see. This is called infrared light.
Many kinds of gas lasers exist today. Carbon dioxide lasers are very strong. They can cut or weld metal in factories.
Excimer lasers use a chemical reaction. These lasers help doctors with eye surgery.
Some lasers use other things for power. Chemical lasers use a reaction to release power fast. They can be very strong. Ion lasers use ions to make light. Metal-vapor lasers use metals to make ultraviolet light.
Gas lasers have many uses. Helium-neon lasers make holograms. They also helped read barcodes in stores. These lasers are good because the parts are cheap. They are also hard to damage. Heat can leave the laser quickly to keep it safe.
A gas laser is a special tool that makes light. It works by sending an electric current through a gas. This process turns electrical energy into a beam of light. This was the first kind of laser to make light continuously.
These lasers are very useful in many different jobs. They are hard to damage and the parts are not expensive. They also let heat escape quickly to stay safe.
How does a gas laser work? It uses a way to move molecules. The gas molecules move from a low energy state to a high energy state. This movement creates the laser beam.
Some lasers use a chemical reaction for power instead. These are called chemical lasers. They can release a lot of energy very fast. This makes them very strong and useful for the military.
People first made a gas laser in 1960. An engineer named Ali Javan and a physicist named William R. Bennett, Jr. co-invented it.
Their first model was a helium-neon laser. It made a beam of light in the infrared region. This light was at 1.15 micrometres. This means humans could not see it with their eyes. Scientists used this discovery to build many other types of lasers.
There are many different types of gas lasers today. Carbon dioxide lasers are very strong. They can emit hundreds of kilowatts for cutting or welding metal.
Nitrogen lasers use nitrogen gas to make ultraviolet light at 337.1 nm. Excimer lasers use a special molecule called an excimer. They are used in eye surgery and making computer parts. Argon-ion lasers make light in the visible range. They often use light at 458 nm or 488 nm.
We see the effects of these lasers in our daily lives. Helium-neon lasers were once used to read barcodes in stores. They are also used to make holograms.
In schools, people use helium-neon lasers because they are cheap. They produce a very good beam for science experiments. Even if you do not see them, these lasers help build and fix many things. They turn electricity and gas into amazing light.
A gas laser is a device that produces coherent light through an electric discharge. This process involves passing an electric current through a gas to create a concentrated beam. The gas laser was a major milestone in physics. It was the first laser capable of producing continuous light. It was also the first device to convert electrical energy directly into laser light output. These lasers are highly valued because they use a large volume of active material. This material is relatively inexpensive to obtain. Additionally, the active material is almost impossible to damage. The design also allows heat to be removed quickly from the cavity.
The mechanism of a gas laser relies on changing the energy of molecules. In these systems, gas molecules are cycled from a low energy state to a high energy state. This movement of energy is what creates the laser beam. This process is different from other lasers that cycle an electron inside an atom. By moving molecules through these energy levels, the device can produce a steady stream of light.
History shows that the first gas laser was the helium–neon laser, or HeNe laser. This device was co-invented in 1960 by Ali Javan and William R. Bennett, Jr. Javan was an Iranian engineer and scientist. Bennett was an American physicist. Their original HeNe laser produced light in the infrared region of the spectrum. This light had a wavelength of 1.15 micrometres. Today, many HeNe lasers operate at 633 nm. These are very common in schools and laboratories. They are popular because they are low in cost and have near-perfect beam qualities.
Scientists have developed many distinct types of gas lasers for different tasks. Carbon dioxide lasers, or CO2 lasers, are extremely powerful. They can emit hundreds of kilowatts of energy at wavelengths of 9.6 μm and 10.6 μm. These are often used in industry for welding and cutting materials. Another type is the nitrogen laser. These use molecular nitrogen as a gain medium to operate in the ultraviolet range. They typically produce light at 337.1 nm. There are also TEA lasers, which stands for Transversely Excited Atmospheric. These use a gas mixture at or above atmospheric pressure and are energized by high voltage.
Some lasers use chemical reactions instead of electricity for power. These are known as chemical lasers. They can release a large amount of energy very quickly. This makes them very powerful and useful for military applications. For example, George C. Pimentel invented hydrogen fluoride and deuterium fluoride lasers. These lasers create light by combining hydrogen or deuterium gas with ethylene combustion products in nitrogen trifluoride. Another specialized type is the excimer laser. These are powered by a reaction involving an excited dimer, or excimer. An excimer is a short-lived molecule formed from two species where at least one is in an excited electronic state. Excimer lasers produce ultraviolet light and are used in LASIK eye surgery and semiconductor photolithography.
Other specialized categories include ion lasers and metal-vapor lasers. Argon-ion lasers emit light between 351 and 528.7 nm. Common lines for these lasers include 458 nm, 488 nm, and 514.5 nm. Metal-vapor lasers also typically generate ultraviolet wavelengths. Examples include helium-silver, neon-copper, and helium-cadmium lasers. These are useful because they have very narrow oscillation linewidths. The copper vapor laser is notable for being the most powerful and efficient laser in the visible spectrum. It produces two spectral lines of green and yellow light.
The applications for these technologies are vast and varied. HeNe lasers are used to make holograms and were once used to read barcodes in stores. While laser diodes have largely replaced them for barcodes, HeNe lasers are still used to write on photosensitive material in laser printing. Different lasers also serve as pumps for other systems. Nitrogen and excimer lasers are used in pulsed dye laser pumping. Argon-ion lasers are used for continuous-wave dye laser pumping. From industrial cutting to delicate eye surgery, the gas laser remains a fundamental tool in modern science and industry.
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