Fiber laser (Fiber Laser) refers to a laser that uses rare-earth-doped glass fiber as the gain medium. Fiber laser can be developed on the basis of fiber amplifier: high power density is easily formed in the fiber under the action of pump light, resulting in laser The laser energy level of the working substance is "number inversion", and when a positive feedback loop (to form a resonant cavity) is properly added, the laser oscillation output can be formed. main application: 1. Marking application Pulsed fiber laser, with its excellent beam quality, reliability, the longest maintenance-free time, the highest overall electro-optical conversion efficiency, pulse repetition frequency, the smallest volume, the simplest and most flexible way to use without water cooling, the lowest Operating costs make it the only choice for high-speed, high-precision laser marking. A set of fiber laser marking system can be composed of one or two fiber lasers with a power of 25W, one or two scanning heads used to guide light to the workpiece, and an industrial computer that controls the scanning head. This design is up to 4 times more efficient than splitting the beam with a 50W laser onto two scanning heads. The maximum marking range of the system is 175mm*295mm, the spot size is 35um, and the absolute positioning accuracy within the full marking range is +/-100um. The focus spot can be as small as 15um at a working distance of 100um. Material handling applications Fiber laser material processing is based on a heat treatment process in which the part where the material absorbs laser energy is heated. Laser light energy with a wavelength of about 1um is easily absorbed by metal, plastic and ceramic materials. 2. Application of material bending Fiber laser forming or bending is a technique used to change the curvature of metal plates or hard ceramics. Concentrated heating and rapid self-cooling lead to plastic deformation in the laser heating area, permanently changing the curvature of the target workpiece. Research has found that the microbending with laser processing has far higher precision than other methods. At the same time, it is an ideal method in microelectronics manufacturing. Application of laser cutting As the power of fiber lasers continues to rise, fiber lasers can be applied on a large scale in industrial cutting. For example: using a fast chopping continuous fiber laser to micro-cut stainless steel arterial tubes. Due to its high beam quality, the fiber laser can obtain a very small focus diameter and the resulting small slit width is refreshing the standard of the medical device industry. Because its wavelength band covers the two main communication windows of 1.3μm and 1.5μm, fiber lasers have an irreplaceable position in the field of optical communications. The successful development of high-power double-clad fiber lasers makes the market demand in the field of laser processing also show up. The trend of rapid expansion. The scope and required performance of fiber laser in the field of laser processing are as follows: soldering and sintering: 50-500W; polymer and composite cutting: 200W-1kW; deactivation: 300W-1kW; fast printing and printing: 20W-1kW ; Metal quenching and coating: 2-20kW; glass and silicon cutting: 500 W-2kW. In addition, with the development of UV fiber grating writing and cladding pumping technology, fiber lasers with output wavelengths up to the wavelengths of purple, blue, green, red and near-infrared light can be used as a practical full-cured light source. Used in data storage, color display, medical fluorescence diagnosis. Fiber lasers with far-infrared wavelength output are also used in the fields of laser medicine and bioengineering due to their smart and compact structure, tunable energy and wavelength and other advantages.
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