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YDFA Gain Block/Special Passive Fiber/Mid-High Power Energy Transfer Fiber Components for Fiber Laser and Device Solutions for Fiber Lasers

2020-06-19 16:13:11 Read

3 dynamics of YOFC fiber optic cable: (1) solution for fiber and device for fiber laser—YOFC gain amplification module—YDFA Gain Block; (2) solution for fiber and device for fiber laser—special passive fiber; (3) laser Solution with optical fiber and device—medium and high power optical fiber components.


  Dynamic


  1


  Changfei Company: Solution of Fiber and Device for Fiber Laser—YOFC Gain Amplifier Module—YDFA Gain Block


   1. Background


   Fiber laser is a solid-state laser that uses rare earth-doped quartz fiber as the gain medium. It is mainly composed of pump source, pump beam combiner, resonant cavity, active optical fiber and isolator.


   Compared with traditional solid-state lasers and CO2 lasers, fiber lasers have three advantages. First, the beam quality is good and the energy density is high, which is suitable for high-speed precision machining; second, the operating cost is low, and its electro-optic conversion efficiency is as high as 30%, which is unmatched by existing solid-state lasers and gas lasers. At the same time, because of the high specific surface area medium of optical fiber, the heat dissipation effect is good, the cooling system is simple and easy to maintain; the third is flexible transmission, the fiber laser has a compact structure and small volume, and uses fiber to transmit laser energy, and the distance between the object and the processing object is small Can be integrated with robotic arm and other automation equipment to form flexible processing.


The special fiber business of YOFC Optical Fiber & Cable Co., Ltd. (hereinafter referred to as YOFC) has been serving China's fiber laser industry for many years, and its special fiber based on fiber lasers have been mass-produced to the market, such as multimode pigtails for pump sources , Signal fiber for pump beam combiner, double-clad ytterbium-doped fiber, signal energy fiber for isolator and collimator, etc. In addition, high-power fiber gratings are also coming soon.


  Figure 1 Fiber laser integrated solution


  Currently, fiber lasers mainly adopt modular design, which is more conducive to structural design and assembly production, and later maintenance and repair are simple and efficient. After being modularized at the same time, a single laser can also be used as an energy module for parallel integration of higher-power lasers with higher operational reliability. Based on the above reasons, electrical and optical layering are designed and assembled. The most important amplifier module in fiber layering is designed as a seed module and a gain amplifier module (hereinafter referred to as Gain Block) according to the power and function.


   2. Introduction of YDFA Gain Block


Based on the technology precipitation in fiber design, manufacturing and application, YOFC provides special fiber solutions for fiber lasers and at the same time, in order to better meet the needs of fiber laser manufacturers in terms of performance improvement, cost control and production standardization, etc. YDFA Gain Block, this module uses YOFC's multimode pump fiber, high-performance double-clad ytterbium-doped fiber and high-precision matching passive fiber. YOFC provides modular solutions for laser manufacturers through stable material supply and overall performance control.


   Among them, the 10/125, 20/125 and other two-stage core gain double-clad ytterbium-doped fiber used in low and medium power pulse marking fiber laser is the result of years of research and technology accumulation of YOFC. The double-clad ytterbium-doped fiber has achieved matte darkening at high doping concentration, higher cladding absorption coefficient, higher conversion efficiency and long-term reliability, coupled with the rapid response of technical support from YOFC This makes YOFC the mainstream fiber supplier in the domestic fiber laser market.

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Figure 2 YOFC YDFA Gain Block


   At present, it mainly introduces the 20W marking fiber laser gain amplifier module suitable for MOPA and Q-switching. The indicators are shown in Table 1. While providing Gain Block, YOFC will also provide optimized optical fiber fusion splicing and other technical services.

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Based on this, YOFC provides a full range of special fiber and key device solutions for low and medium power fiber lasers. As a leading manufacturer of special optical fiber in China, YOFC will continue to dig deep into the key technologies of special fibers and devices, and contribute to the vigorous development of the fiber laser industry!


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  Dynamic


  2


  Changfei Company: Optical Fiber and Device Solutions for Fiber Lasers—Special Passive Optical Fiber


  ICCSZ News With the rapid development of China's manufacturing industry, the fiber laser market has grown rapidly. In the field of industrial processing, ytterbium-doped fiber lasers with a laser wavelength of 1 μm have a very wide range of applications, such as laser marking, laser welding, and laser cutting. In the fiber laser system, in addition to the core active fiber, it also involves a variety of passive fibers, such as fiber gratings, passive matching fibers in fiber isolators, passive matching fibers in fiber combiners, and Source multimode large core diameter energy coupling fiber, passive multimode large core diameter energy transfer fiber in laser energy transmission components and other passive fibers.

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Figure 1 is a schematic diagram of a fiber combiner model, taking a certain combiner as an example, in which 1, 2 fibers are matched and used, the types are 105/125-0.22NA; 200/220-0.22NA; 3, 4 fibers are matched and used, The types are: 10/130-0.08NA; 20/130-0.075NA; the above four types of optical fibers are special passive optical fibers.


   1. YOFC Special Passive Optical Fiber Products


After years of technology accumulation, platform construction and product development, YOFC Optical Fiber & Cable Co., Ltd. (hereinafter referred to as YOFC), based on the MCVD platform, adopted the CDS chelate and aluminum ytterbium ternary system doping process for the first time in China. Successfully developed 125μm series large-mode field double-clad ytterbium-doped fiber positioned in low-power fiber lasers and 20/400 series double-clad ytterbium-doped fiber positioned in medium-high power fiber lasers. At the same time, based on the unique PCVD core technology, YOFC has successfully developed a series of passively matched optical fibers and large-core optical fibers.


   Generally, fiber lasers have good beam quality, and the beam quality M2 is generally less than 1.5. At the same time, high-power laser transmission also requires the fiber to have a large mode field area, which requires the laser propagation mode in the fiber. Therefore, the key waveguide parameters such as the core diameter and numerical aperture of passively matched optical fibers need to be controlled very accurately, so as to achieve precise control of the fiber mode. One of the main advantages of the PCVD process is that it enables accurate control of fiber waveguide parameters. On this basis, YOFC effectively achieved the excellent geometric index and batch consistency of optical fiber through the big stick process route. In order to effectively improve the utilization rate of pump light, the passive matching optical fiber developed and produced by YOFC has an excellent double-clad structure, and a special low-refractive index coating has achieved a numerical aperture (NA) of up to 0.46 or more. Under harsh environment, it still has good mechanical and environmental reliability. The main product models of this series are shown in Table 1.


   Second, YOFC special passive optical fiber product parameters


   YOFC's passive matched optical fibers have good geometric indicators. For example, the core-concentricity of 130 series fibers is less than 0.7μm, the core-concentricity of 250 and 400 series fibers is less than 2μm, and the cladding out-of-roundness is less than 0.5%. Good geometric parameters can effectively guarantee the splicing quality of the optical fiber and the production efficiency of the device.

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The passive matching optical fiber of YOFC has the following advantages: First, it is compatible with the active optical fiber of YOFC and has low fusion loss (the fusion loss of 10/130 series passive matching fiber and corresponding type of active fiber is less than 0.15dB@1310nm); 2. The quality M2 of the outgoing laser beam can reach 1.1; 3. It has good mechanical properties, the dynamic fatigue parameter (nd) reaches 25 or more, and the breaking force reaches 5GPa or more; 4. The reliability is high, and the self-developed high reliability is used. Coating technology, the peeling force is between 1.6N~3.2N, and passed the rigorous high pressure boiling test (126 ℃, 1.5 atm, 8 hours).


YOFC's passive matching optical fiber has passed the verification of several domestic device manufacturers, showing good performance indicators. The device fiber combiner and optical fiber prepared by YOFC's 10/130 series passive matching optical fiber The gratings have passed the relevant reliability verification, and the indicators are in accordance with the experimental design requirements, as shown in Table 3.

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 On the other hand, at the output end of the pump light source, the beam combiner, and at the output end of the fiber laser, fibers with large core diameters and higher numerical apertures are required. YOFC used PCVD technology to achieve high concentration of fluorine (F) doping, and successfully prepared optical fiber preforms with NA up to 0.22. Combining coating technology and large-size optical fiber drawing technology, a series of multi-mode large-core diameter energy-transmitting optical fiber products have been successfully implemented, such as 105/125-0.22NA, 200/220-0.22NA and other models. It has been successfully used in high power fiber combiners and energy transmission components.

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*Can provide 0.12NA, 0.15NA products.


   3. Outlook


  Like active fiber, special passive fiber is also a key part of fiber laser. The domestic fiber laser industry is in a period of rapid development, and the demand for the localization of high-end special optical fibers is clear and growing. With the continuous improvement of laser power, the performance requirements of optical fibers are becoming higher and higher. Mastering the core optical fiber design technology, optical fiber preform preparation technology, special coating technology, optical fiber drawing technology and optical fiber testing technology is to achieve high reliability. The necessary guarantee of source special optical fiber is also the advantage of YOFC. YOFC will fully support the development of the fiber laser industry, spare no effort to meet customer needs, and make continuous efforts for the localization of special optical fibers.


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  Dynamic


  3


  Changfei Company: Laser Fiber and Device Solutions-Medium and High Power Energy Transmission Fiber Components


   1. Industry background


  As an important symbol of the development of science and technology in the 20th century and one of the pillars of optoelectronic technology in the modern information society, the development of laser technology and the laser industry has received widespread attention worldwide. Among them, as an important application of laser technology, laser processing has penetrated into the traditional industry in an all-round way, and has promoted the continuous update and upgrade of traditional industrial manufacturing technology. Today, laser processing is capable of cutting, welding, drilling, scribing, cleaning, and cladding various materials, and has the characteristics of good processing accuracy, high processing efficiency, and excellent quality that are not available in traditional processes.


  As the link between the laser and the material to be processed, the energy-transmitting fiber optic components are essential in the laser processing process. It realizes the flexible transmission of the laser and accurately introduces the laser into the area to be processed, which is an important part of precision machining.


   Second, YOFC's energy transmission optical fiber component specifications


According to different applications, different connector types are selected. Industrial applications are mainly HP-SMA and YLD80 optical fiber connectors (as shown in Figure 1), and there are two types of water cooling and no water cooling according to the transmission power. Types, and in order to further improve heat dissipation and other functions, YLD80 fiber optic connectors are also divided into two types with and without sapphire.

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Figure 1 Energy-transmitting optical fiber component products (YLD80 on the left, HP-SMA on the right)


  Changfei Optical Fiber & Cable Co., Ltd. (hereinafter referred to as YOFC) developed a series of energy-transmitting optical fiber components based on market applications. The basic specifications and models are shown in Table 1.

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Figure 1 Energy-transmitting optical fiber component products (YLD80 on the left, HP-SMA on the right)


  Changfei Optical Fiber & Cable Co., Ltd. (hereinafter referred to as YOFC) developed a series of energy-transmitting optical fiber components based on market applications. The basic specifications and models are shown in Table 1.

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Figure 2 Results of laser energy transmission test (peak power: 6kw, pulse width: 6.2ms, repetition frequency: 15Hz)


   Within 8 hours, the average output power of the module is 500.0±5.7W, the transmission instability is less than 1.5%, and the laser transmission efficiency is more than 92%. After a period of stable transmission, the temperature of the component connector stabilized at 41°C. It can be seen that the energy transmission fiber component developed by YOFC has excellent laser transmission performance and is stable and reliable.


  3) Excellent laser processing effect


Taking laser welding as an example, this verification uses an IPG laser. When the whole machine is tested under a certain set of parameters, the single pulse energy is almost the same during the whole machine test of YOFC and a foreign friend's optical fiber structure 200μm core energy transfer fiber optic component. . Table 3 is the comparison of two optical fiber welding indexes in the actual verification of laser welding.

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Table 3 Comparison of fiber laser welding performance between YOFC and a foreign friend


The structure of 200 μm core-conducting optical fiber components of YOFC and a foreign friend company is similar in welding spot shape and welding spot radius. In terms of fusion penetration index, YOFC is slightly lower than a foreign friend optical fiber. But because of this small difference, it has little effect in actual use.


  In addition to conventional single-core energy-transmitting optical fiber components, YOFC has also developed multi-core bundled energy-transmitting optical fiber components (Figure 3). The multi-core bundle energy-transmitting optical fiber component is made of a special ferrule, and the improved technical process can also prevent the negative effects of high temperature generated by the high power of the bundle. According to the actual needs of customers, we can also provide rectangular or square bundle products. YOFC will adhere to the values of "customer, responsibility, innovation and win-win" to provide efficient solutions for the laser energy transmission market.


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