There are a lot of people that have the need for a laser machine but many do not really know how a fiber laser works. So whether you are looking to just brush up on your knowledge and something new on how a fiber laser work or you are new to this Industry, this article is for you.
What is a Fiber Laser?
This is the type of laser where an optical fiber is being used as the active medium. The optical fiber being used here has been doped in rare elements such as ytterbium, erbium, neodymium, praseodymium, thulium, holmium or dysprosium. You do not need to worry too much about the earth element that has been used, what is of utmost importance is that fiber is being used at the center of this laser cutter. Fiber lasers are different from the other two major types of lasers which are gas lasers (this typically uses CO2 or helium-neon) and crystal lasers (this uses ND: YAG). Fiber laser technology is the newest of these lasers and many are of the opinion that they are the most beneficial of the three types.
How Does a Fiber Laser Work?
As stated earlier, the fiber that is used as the central medium in this laser will have to be doped in rare-earth elements and Erbium is the most used element. The reason for this is that the atom levels of these rare-earth elements have very useful energy levels which allow for a diode laser pump source that is cheaper to be used, yet they still provide a high energy output. For instance, by doping fiber in Erbium, an energy level that is capable of absorbing photons with a wavelength of about 980nm is decayed to a meta-stable equivalent of 1550nm. This means that it is possible to use a laser pump source at 980nm and still achieve a high energy, high quality, and high power laser beam of 1550nm.
The photons that are emitted remains within the fiber core and the Erbium atoms act as the laser medium in the doped fiber. In order to create a cavity in which the photons can be kept entrapped, something referred to as Fiber Bragg Grafting is added. This is simply a section of glass with stripes in it; this is the point at which the refractive index has been altered. A small beam of light is refracted back anytime light passes across a boundary between one refractive index and I he next. The pump laser is targeted at a cladding that sits around the fiber core; the fiber core on its own is too small to have a low quality diode laser targeted at it. The laser is bounced around inside by pumping the laser into the cladding around the core and every time that it passes the core more and more of the pump light is absorbed by the core. Click here.
Benefits of a Fiber Laser
One of the benefits of a fiber laser is that it is extremely stable. Other types of laser cutters are very sensitive to movement and the whole alignment can easily be thrown off should they get banged or knocked. Fiber lasers generates their own laser beams on the inside of the fiber, this means that sensitive options are not needed to have this to work properly. Another benefit of the fiber laser is it delivers an extremely high beam quality. This is because the beam remains contained within the core of the fiber and this helps to keep a straight beam that can be ultra focused. Also, despite the high power output and high intensity fiber lasers work at they are extremely cool and they are highly efficient as well.