2020 Xiamen Industrial Expo and the 24th cross strait machinery and …
1. Principle
Fiber is usually glass solid fiber drawn from SiO2 as the matrix material, which is widely used in optical fiber communication. Its optical guiding principle is the mechanism of total internal reflection of light. The
common naked fiber is generally composed of a high refractive index glass core and a low refractive index silicon glass cladding in the middle.
The most external reinforced resin coating is composed.
Fiber can be divided into single-mode fiber and multimode fiber. Single mode fiber: the center glass core is thin, and can only transmit one mode light. The dispersion between modes is very small, and it has the
function of self-selection and mode limiting. Multimode fiber: the center glass core is thick, and can transmit various modes of light, but its mode dispersion is large and the transmission light is not pure.
2. Advantages
Fiber laser has the characteristics of small volume, low energy consumption, long life, high stability, maintenance free, multi band, green environmental protection, etc. it has won the affirmation of many laser
industry insiders for its superior beam quality, stable performance and ultra-high photoelectric conversion efficiency.
Fiber laser sets a new standard for laser processing industry with its ultra-high reliability, excellent beam quality and low operating cost.
It has long gain medium, high coupling efficiency, good heat dissipation, simple and compact structure, flexible and convenient use, good output laser beam quality and wide output wavelength range.
1. High power fiber lasers are all double clad fibers. When the pump light hits the cladding, the energy is absorbed and then partially converted into laser. Therefore, the cladding material and structure have a
great influence on the fiber lasers. At present, various shapes of fibers have been developed in various countries, including round, D-shaped, rectangular, unstable cavity, quincunx, square, plane thread, etc.
2. Without thermoelectric cooler, this kind of high-power wide area multimode diode can work at very high temperature with simple air cooling and low cost.
3. The active cladding fiber in the high power fiber laser is doped with ER / Yb rare earth elements and has a wide and flat optical absorption region. Therefore, the pump diode does not need any type of
wavelength stabilization device.
4. High efficiency. The pump light passes through the single-mode fiber core many times, so its utilization is high.
5. High reliability. The side pump is directly welded and coupled with branched fiber. On the one hand, there is no need for any optical elements; on the other hand, it can avoid damaging the end face of the
fiber; on the other hand, it is easy to improve the injection efficiency of the pump source. Novel centipede type side pump mode: there are many fiber branches on both sides of the fiber, which are directly fused
with the LD tail fiber, a single pump from different points can avoid the nonlinear effect and mode deterioration caused by a single point of intense laser.
Several high power single LD transistors are used instead of LD integrated array as pump source, A mode for improving the light source,
Second, it is easy for the heat dissipation of the pump source to improve the service life,
Third, it is conducive to maintenance and replacement.
Using LD with wide light-emitting surface as pump source can greatly reduce the light power density of LD light-emitting point and improve its service life, which can generally reach 100,000 hours.
3. Applications
The fiber laser only consumes the power required by 1% of the lamp pump laser, and its efficiency is more than twice that of the solid-state laser.
The combination of higher efficiency, longer service life and less maintenance makes the cost of the owner of fiber laser attractive. Fiber laser is very useful in laser applications which require high beam quality
in near infrared. They will focus on small spots.
High power density has special interests, such as desktop production. A 100W laser output spot can be focused to 5um so small, which is equivalent to 109w/cm2 brightness.
The fiber laser only consumes the power required by 1% of the lamp pump laser, and its efficiency is more than twice that of the solid-state laser.
The combination of higher efficiency, longer service life and less maintenance makes the cost of the owner of fiber laser attractive. Fiber laser is very useful in laser applications which require
high beam quality in near infrared. They will focus on small spots.
High power density has special interests, such as desktop production. A 100W laser output spot can be focused to 5um so small, which is equivalent to 109w/cm2 brightness.
4. Disadvantages
The price is relatively high, which is usually limited in the field of metal processing, and it is unlikely to make a difference in non-metal processing. Materials such as plastic, paper or cloth. These industries will
continue to be dominated by CO2 laser. Compared with the traditional laser cutting machine, the advantages of optical fiber cutting are that it can be used for plane cutting and oblique angle cutting, and the
edges are neat and smooth. It is suitable for high-precision cutting of metal plate and glass. Compared with ordinary CO2 laser cutting machine, it can save space and gas consumption, and has high
photoelectric conversion rate. It is a new product of energy saving and environmental protection, and also one of the world’s leading technology products.
The electro-optic conversion efficiency of fiber laser cutting machine is 25%, which is several times higher than that of traditional laser cutting machine. However, the comprehensive operation cost is only 15%
of traditional laser cutting machine. At the same time, the volume of fiber laser cutting machine is small, and its laser generator is easy to operate.
It covers an area of less than 1 square meter, and the overall area is about 50 square meters, which is two-thirds of the traditional laser cutting machine.