Fiber Laser Advantages And Harms

Compared with traditional gas lasers and solid lasers, the lasers in fiber laser marking machines have six major advantages of Fiber Lasers that use doped optical fibers as the working medium. Here are the six advantages of the fiber lasers.

1. The gain medium has a large surface area/volume ratio
Fiber lasers use optical fiber as the gain medium, which has a 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 damaged by heat, and generally there is no need to modify the gain. The medium takes special heat dissipation measures. 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 confinement mechanism
High-power all-fiber lasers use double-clad active fibers. This double-layer fiber is a double waveguide structure. The high-power multi-mode pump light is restricted to the inner cladding with a larger diameter for transmission. In order to use high-power and low-cost The multi-mode pump light provides conditions for the signal laser to be generated and transmitted in a fiber core with a small diameter and a circularly symmetrical waveguide structure. Under the limitations of the small core diameter fiber core waveguide, the signal laser can obtain ideal beam quality and The extremely small light spot diameter is an important and unique attractive feature of all-fiber lasers. Among high-power lasers, there is currently no laser that can surpass it. Excellent beam quality and extremely small light 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 focus 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 entirely composed of optical fibers and optical fiber components. The optical fibers and optical fiber components are connected using fiber fusion splicing technology. The entire optical path is completely enclosed in the optical fiber waveguide. Once this natural fully enclosed light path is formed, it can form a self-contained system without additional isolation measures to achieve isolation from the external environment. Because the optical fiber is small and has good flexibility, the light path can be coiled and travel along small pipes. Therefore, all-fiber lasers can work in relatively harsh environments, and the output light can pass through narrow gaps or travel long distances along small pipes. transmission. These characteristics have great advantages in industrial applications. The laser can not only adapt to relatively harsh working environments, but also can make the laser light point. It can introduce the laser to places that were difficult to reach before, and it can be very easy to move and change the light point to achieve processing. Sharing one laser can make the design of laser processing equipment more flexible and so on.

4. The optical path is maintenance-free
As mentioned before, the Guangu of the all-fiber laser is entirely composed of optical fibers and optical fiber components. The optical fibers and optical fiber components are connected using fiber fusion splicing 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 optical fiber components themselves can have long-term stability, the entire optical path will be stable for a long time without maintenance. It should be noted that this maintenance-free feature is not impossible to maintain and repair. If necessary, maintenance and repair of the entire optical path can also be carried out. Therefore, compared with gas and solid lasers that require frequent maintenance and repair, the entire optical path is more reliable. The maintenance-free characteristics of the optical path of fiber lasers are extremely excellent, and compared with the non-repairability of semiconductor lasers, the maintainability and repairability of all-fiber lasers show obvious advantages.

5. Long life
The optical path of the all-fiber laser has long-term stability. Therefore, a matching long-life pump laser is required to obtain a long life of the entire machine. The development of low-priced long-life multimode pump lasers has focused on the development of long-life fiber lasers. A single wide-emitting area multi-mode pump laser is such a long-life semiconductor pump laser. Its strip width is generally 100mm, which is basically close to the core diameter of 105/125 multi-mode fiber. Its active area strip width is column Dozens of times that of array semiconductor lasers. For a single light-emitting strip, with 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. Neglecting Under the premise of other factors, the effect of a single wide-emitting area semiconductor pump laser on reducing the failure rate is extremely significant. At present, the average trouble-free working time of a single wide-emitting area semiconductor 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 optical 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
Since the optical path of the all-fiber laser can be coiled, the optical path takes up less space. When a single wide-emitting area semiconductor pump laser is used as the pump source, the pump laser can be installed dispersedly and has good heat dissipation characteristics. When the installation density is not high, When the installation density is high, cooling can be used. When the installation density is high, only a small amount of water can be used to meet the heat dissipation requirements. Therefore, the volume of the all-fiber laser is smaller than that of gas and solid laser systems with the same output power. Lighter weight.

Does fiber laser emit radiation?
Does a fiber laser emit radiation when it is working? The International Standard Classification is a consistent classification method recognized by the scientific community around the world. This facilitates the unification of safety levels of laser equipment and national trade. The classification is divided into: Level 1, Level 2, Level 3, Level 4, a total of 4 levels.

The higher the classification level, the greater the risk. Laser grade regulations must be marked on the laser system using Roman numerals. All regular laser products are generally labeled with classification labels. In addition to graphic and text warnings, the labels also include the following information: wavelength, total output power, and laser classification.

The following is an explanation of Class 4 laser:
1. Security level: Level 1. Laser power: less than 0.5 milliwatts, safety laser, Class 1 laser will not cause harm to human health under normal conditions of use, but such products must ensure that they use measures to prevent workers from entering the laser radiation area during work. design.

2. Security level: Level 2. Laser power: 1 milliwatt. This level of laser has low power and visible laser. Humans can protect themselves by blinking their eyes against strong light, but looking directly at it for too long will cause danger. The secondary laser should be at the laser exit. Some require warning signs to be posted.

3.Safety level: Level 3. Level 3 is divided into two types: 3a and 3b. Level 3a laser, laser power: 1 mW to 5 mW. Level 3a laser is the same as level 2. A warning sign needs to be posted at the laser light outlet. The human eye can only see for a short time, and the protective reflection of light by the human eye will play a certain protective role. However, if the light spot enters the human eye when it is focused, it will cause damage to the human eye.

Class 3b laser, laser power: 5 milliwatts. to 500 milliwatts and may cause harm if viewed directly or diffusely reflected. Class 3b lasers are generally labeled with a "danger" sign. Although they are harmful to the eyes, there is a small risk of causing a fire or burning the skin if the light spot is not focused. However, it is still recommended to wear eye protection when using this level of laser.

4. Safety level: Level 4. Laser power: more than 500 milliwatts. This level of laser is very harmful to the eyes and skin. Direct reflection and diffuse reflection will cause damage. All Class 4 laser equipment must bear a "DANGER" sign. Level 4 lasers can also damage materials near the laser and ignite flammable substances. When using this level of laser, you must wear eye protection like level 3b.

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