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Fiber Laser Application
Sep 19, 2018

As the representative of the third generation laser technology, fiber laser has the unparalleled technical superiority of other lasers. In the short term, fiber lasers will focus primarily on high-end applications. With the popularity of fiber lasers, cost reduction and increased productivity, most of the world's high-power CO2 lasers and most YAG lasers will eventually be replaced.

With the maturity of optical fiber manufacturing technology and semiconductor laser production technology, optical fiber-based fiber lasers have made significant progress in reducing threshold, oscillation wavelength range, and wavelength tunability, becoming an emerging technology in the field of lasers. One of the many popular research topics.

The fiber laser uses a rare earth doped fiber as the gain medium, and the pump light forms a high power density in the core, which causes the “particle number reversal” of the doped ion level. When a positive feedback loop is properly added to form a resonant cavity, Produce a laser output. Fiber lasers are used in a wide range of applications, including fiber optic communications, laser space telecoms, shipbuilding, automotive manufacturing, laser engraving machines, laser marking machines, laser cutting machines, printing rolls, metal non-metallic drilling/cutting/welding Military and national defense security, medical equipment and equipment, large-scale infrastructure construction, etc.

Fiber lasers, like other lasers, rely on a working medium that produces photons to cause photons to be fed back and resonate in the working medium. The fiber laser consists of an optical cavity and a pump source that excites the light transition, except that the working medium of the fiber laser is a doped fiber that simultaneously acts as a waveguide. Therefore, the fiber laser is a waveguide type resonance device. The fiber laser is generally optically pumped. The pump light is coupled into the fiber. The photons at the pump wavelength are absorbed by the medium to form a population inversion. Finally, the excited radiation is generated in the fiber medium to output the laser. Therefore, the fiber laser Essentially a wavelength converter.

The rapid advancement of fiber laser technology has also led to the development of fiber laser cutting machines. Fiber laser cutting machines have faster cutting speeds and use costs of only 20% to 30% of conventional equipment. Fiber lasers can also reduce the use of lenses, greatly reducing production and maintenance costs.

The fiber laser uses optical fiber as the waveguide medium, which has high coupling efficiency, easy formation of high power density, good heat dissipation effect, no need for a huge refrigeration system, high conversion efficiency, low threshold, good beam quality and narrow line width.

There is no optical lens in the cavity of the fiber laser, which has the advantages of no adjustment, no maintenance and high stability. The long working life and maintenance-free time, the average maintenance-free time is over 100,000 hours. Fiber lasers can achieve laser output in the 380nm-900nm range by doping different rare earth ions. Wavelength selection and tunability can be achieved by adjusting the fiber grating resonator. Compared with traditional solid-state lasers, fiber lasers are small in size, long in life, easy to integrate in systems, and operate normally in high temperature, high pressure, high vibration, high impact and harsh environments. The output spectrum has higher tunability and choice. 

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