1. The surface area / volume ratio of the gain medium is large
Fiber lasers use fiber as the gain medium, which has a very large surface area / volume ratio, which makes it have very good heat dissipation performance. Therefore, even for very high-power fiber lasers, the gain medium will not be thermally damaged, and generally does not The medium adopts special heat dissipation measures, and for other types of lasers, the heat dissipation of the gain medium needs to be considered. Therefore, this feature is unique to fiber lasers.
2. Excellent dual waveguide limiting mechanism
High-power all-fiber lasers use double-clad active fiber. This double-layer fiber is a double-waveguide structure. High-power multimode pump light is limited to transmission in an inner cladding with a larger diameter. The multimode pump light provides the conditions for the signal laser to be generated and transmitted in the core with a circular symmetric waveguide structure with a small diameter. Under the limitation of the small core waveguide, the signal laser can obtain the ideal beam quality and The extremely small light spot diameter is an important and attractive feature of all-fiber lasers. Among high-power lasers, there is no laser that can surpass it. Excellent beam quality and extremely small beam spot diameter are of great significance in laser applications, which can make the optical system of subsequent application equipment simpler, smaller in size, longer in working distance, smaller in laser focusing spot, and more efficient in work High, deeper processing depth, better processing quality, etc.
3. Inherent fully enclosed flexible optical path
The optical path of the all-fiber laser is composed of optical fibers and optical fiber components. The optical fibers and optical fiber components are connected by fiber fusion splicing technology. The entire optical path is completely enclosed in the optical fiber waveguide. Once this natural fully enclosed optical path is formed, it can form a system without additional isolation measures to achieve isolation from the external environment. Because the optical fiber is small and has good flexibility, the optical path can be coiled and travel along a small pipe. Therefore, the all-fiber laser can work in a harsh environment, and the output light can pass through a narrow gap or travel a long distance along the small pipe transmission. These features have great advantages in industrial applications. The laser can not only adapt to the harsh working environment, but also can make the laser light point. It can introduce the laser to places that were difficult to reach before. It can be easily moved and changed the light point to achieve processing. A common laser can make the design of laser processing equipment more flexible and so on.
4. The optical path is maintenance-free
As mentioned above, the Guangu of an all-fiber laser is composed entirely of optical fibers and optical fiber components. The optical fiber and optical fiber components are connected by fiber fusion welding technology. Therefore, once the optical path is completed, it forms a whole. Practice has proved that the link structure formed in this way And the connection parameters will remain stable for a long time. If the optical fiber and the optical fiber component can have long-term stability, the entire optical path will be stable for a long time without maintenance. It should be particularly pointed out that this maintenance-free feature is not unmaintainable and repairable. The maintenance and repair of the entire optical path can also be performed when necessary. Therefore, compared with the frequent maintenance and repair of gas and solid-state lasers The maintenance-free characteristics of the fiber laser optical path are exceptionally excellent, and compared with the non-maintainability of the semiconductor laser, the maintainability and repairability of the all-fiber laser show obvious advantages.
5. Long life
The optical path of the all-fiber laser has long-term stability. Therefore, it needs a long-life pump laser to match it to obtain a long life of the whole machine. The development of low-price, long-life multimode pump lasers is the focus of the development of long-life fiber lasers. The single wide-mode multimode pump laser is such a long-life semiconductor pump laser. The strip width is generally 100mm, which is basically close to the core diameter of 105/125 multimode fiber, and the active area strip width is column. Arrays of semiconductor lasers are dozens of times, for a single light bar, under the same output power and the same injection current, its optical power density and current density will be reduced by dozens of times, and the temperature of the active area will also be reduced On the premise of other factors, the effect of a single wide-emitting diode pump laser in reducing the failure rate is remarkable. At present, the average trouble-free working time of a single wide-emitting diode pump laser with a pigtail output power greater than 5W has reached more than 500,000 hours. Using a single wide-emitting-area semiconductor pump laser as the pump source of the light laser, the all-fiber laser will have the characteristics of long life. Therefore, it is technically feasible to produce a long-life fiber laser with hundreds of thousands of hours.
6. Small size and light weight
All-fiber lasers can be coiled, and the optical path takes up less space. In the case of using a single wide-emitting-area semiconductor pump laser as the pump source, the pump laser can be distributed and has good heat dissipation characteristics. The installation density is not In the case of high temperature, cold can be used. In the case of high installation density, only a small amount of water can meet the heat dissipation requirements. Therefore, the volume of the all-fiber laser is smaller than that of gas and solid-state laser systems with the same output power but lighter weight.