How lasers work


Guest post by Annah

Laser technology is widely used today. It can be found in so many things such as CD players, high-speed metal cutting machines, hair replacement surgery, eye surgery and much more. A very simple application of laser is the use of the laser based bar code scanners that reads the bar code of a product when it is billed, thus removing the need for putting pricing labels on the product.

In its most complex application, lasers can actually cut through metal and even weld it, at tremendously high speed, thus making such process all the more easier and quicker to accomplish. The most common types of lasers seen today are helium-neon lasers, argon lasers, solid state lasers and semiconductor lasers.

The design of a laser device is pretty simple. It has a long tube that contains within it lasing material. This lasing material can be made from different types elements such as helium, xenon, rubies and so on. There are two mirrors located in either end of the material. One mirror will have a hole in it that is used for concentrating the laser light. The tube has a flash tube over it that sends out high density light.

The laser light is emitted when the flash tube is switched on. This action sends out photons which hit the laser’s lasing material. The photons pass on energy to the electrons and agitate the electrons. The resulting process creates more photons. The photons move excitedly through the tube area and as they do this, they bounce off the tube’s mirrors and in the process generate a lot of electrons. These electrons generate energy of their own and this whole process continues as long as energy enters the lasing material of the laser device. When the energy passes through the small hole located in one end of the tube, what comes out is laser light.
The characteristics of light produced by laser are:

It emits a single color light.
It has more consistency
The ray of the light is sturdy and tight

How Lasers Work To Remove Tattoo Ink

Although tattoo pigments may look solid on the skin, they really exist as large colored particles suspended in the dermal layer.

The energy from the laser is absorbed by the ink pigment, which serves as a chomophore target. Different tattoo colors will absorb different wavelengths. For this reason, black ink is the easiest color in laser tattoo removal since black will absorb any wavelength.

Once the light is absorbed, it breaks up the pigment into smaller particles which are then absorbed by the body to be eliminated. As simple as this may sound, this process takes several weeks. More than one session is usually required. And the practicing specialist will recommend spacing them out by 4-6 weeks. It can take between 5-15 treatments to completely remove the tattoo. However the type of ink, the size of the tattoo and the colors used will determine the length of the overall process.


The range of applications of lasers is surprising, to the point of reaching a much wider area than originally conceived by the scientists who designed the first models (though hardly admit it), and far exceeds the vision of the first science-fiction writers, who in most cases only failed to see in it a futuristic weapon, (but do not seem willing to confess their lack of imagination.) Also surprising is the variety of existing lasers.

At one end of the range are made from tiny lasers semiconductor wafer similar to those used in electronic circuits, with a size no bigger than a grain of salt. Gordon Gould, a pioneer in this field, confessed he was impressed when they were introduced. At the opposite end military lasers are the size of a building, which the military is currently experiencing very different from the guns they had imagined lanzar rayos writers of science fiction.

In this book we intend to not only talk about lasers, but also explain their current applications, as well as a near future, and how that will affect, therefore our lives.

Tasks performed by the laser ranging from the mundane to the esoteric but share a common element: they are difficult or totally impossible with any other instrument. Lasers are devices relatively expensive and usually only used for its ability to provide the form and amount of energy required in the desired location.

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