Fiber doped with rare earth elements for the development of Fiber Optic Laser amplifier has brought a revolutionary change in the field of Lightwave Technology. Any light laser amplifier can be formed through appropriate feedback mechanism, the fiber laser can be developed on the basis of the optical fiber amplifier. The development of fiber lasers doped rare earth elements of the optical fiber as the gain medium. Very fine fiber core fiber laser, fiber in the role of the pump light can easily form a high power density, resulting in the laser energy level of the laser material, "inversion". Therefore, when adding the appropriate positive feedback loop (composition of the cavity) can form a laser oscillation. In addition, the fiber matrix has a very broad fluorescence spectrum, fiber lasers in general can be made tunable, very suitable for WDM system applications.
We can be classified from different angles on the Fiber Optic Laser Tester, fiber laser cavity structure can be divided into two major categories of the Fabry-Perot cavity and the ring cavity. According to the number of output wavelength can also be divided into single wavelength and multi-wavelength. Characteristics of different types of fiber lasers should consider the following points: (1) the threshold should be as low as possible; (2) output power with a linear pump power is better; (3) The output polarization state; (4) The model structure; (5) energy conversion efficiency; (6) laser operating wavelength.
And semiconductor lasers, fiber lasers superiority: fiber laser waveguide structure that can accommodate strong pump, a high gain, high conversion efficiency, low threshold, the output beam quality, narrow linewidth, and a simple structureand high reliability features, easy to implement and fiber coupling.
And compared to the CO2 laser, CO2 laser applications in a more stable and large-format, faster machine, the fiber laser is mainly for 2mm below the surface for processing. The main advantage of fiber lasers: a fiber laser and CO2 laser wavelength between the difference of an order of magnitude, CO2 laser optical fiber transmission, fiber laser with fiber-optic transmission, greatly increasing the degree of processing flexibility; photoelectric conversion rate of fiber lasers up to 25% CO2 laser photoelectric conversion rate was only about 10% of electricity consumption, supporting the cooling system and other aspects of the advantages of fiber lasers is quite obvious.
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