Fiber optic laser

Lasers are one of the most important things in our lives. In the article has explained the for you what is the relevant content of fiber laser, but in order to make good further master the knowledge of the fiber laser, today I will again for you to renew the knowledge of the fiber laser, this article focuses on is the main application field for fiber laser and fiber laser in our country the research progress on the point of knowledge.

1. Marking application

Pulse fiber laser with good beam quality, reliability, and the longest free maintenance time, with the highest overall electro-optic conversion efficiency, pulse repetition frequency, the smallest volume, don't need to water the simplest and the most flexible way of use, the lowest operating cost makes it in high speed, high precision laser engraving the only choice.

A set of optical fiber laser marking system consists of one or two power of 25 w fiber laser, one or two is used to guide the light to the workpiece on the scan head and a control of industrial computer scanning head. The design is more than four times more efficient than using a 50W laser beam to two scanning heads. The maximum marking range of the system is 175mm * 295mm, the spot size is 35um, and the absolute positioning accuracy is + / -100um in the whole range. The focus of 100um working distance can be as small as 15um.

2, the application of material bending

Optical fiber laser forming or folding is a technique used to change the curvature of metal plates or hard ceramics. The concentrated heating and rapid self-cold cutting result in the plasticity of the laser heating area, which can permanently change the curvature of the target workpiece. The study found that microbending of laser processing is far more sophisticated than other methods, and this is an ideal method in microelectronics manufacturing.

3. Application of material handling

The material treatment of fiber laser is the heat treatment process which is heated by the material absorbing the laser energy. Laser light can easily be absorbed by metal, plastic and ceramic materials.

4. Application of laser cutting

As the power of fibre optic lasers continues to rise, the fiber laser is used in industrial cutting. For example: the continuous fiber laser with fast chopper is used to micro-cut the stainless steel artery. Because of its high beam quality, the fiber laser can obtain very small focus diameter and the resulting small slit width is refreshing the standard of the medical device industry.

Because of its band covers 1.3 mu m and 1.5 mu m two main communication window, so the fiber laser has an irreplaceable position in the field of optical communication, the successful development of high power double clad fiber laser in the laser processing in the field of market demand is also a trend of rapid expansion. The scope and requirements of fiber laser in laser machining are as follows: soft soldering and sintering: 50-500w; Cutting of polymer and composite materials: 200w-1kw; To activate: 300w-1kw; Quick printing and printing: 20w-1kw; Metal quenching and coating: 2-20kw; Glass and silicon cutting: 500 w-2kw. Moreover, with uv fiber grating written and cladding pump technology development, the output spectrum in the violet light, blue, green, red and near-infrared light of wavelength conversion on fiber laser has can be used as a practical complete curing light source and is widely used in data storage, color display, medical fluorescence diagnosis. The optical fiber lasers of far-infrared wavelengths are also applied in laser medical and biological engineering, due to its flexible structure, energy and wavelength tunability.

The current research progress of fiber optic laser in China

Nankai university reported in 2002 in Yb3 + doped double clad fiber is obtained in the pulse width 4. 8 ns pulse output adjusting Q and blended to Q of double cladding fiber laser peak power is greater than 8 kw, the pulse width less than 2 ns pulse output.

In 2003, nankai university reported that the pulse pump received 100kW peak power and the 60nm tunable Q pulse.

On November 20, 2003, Shanghai scientists achieved new results in the laser field and successfully developed a fiber laser with a power output of 107W. This laser all known as the "high power" ytterbium doped double clad fiber laser, compared with the existing laser its maintenance cost and power consumption is much lower, the life is ordinary laser dozens of times. One of the group, the head of the qi-hong Lou researcher, told reporters that laser printing has a broad application prospect, is directly related to life such as food production date, anti-counterfeiting marks or other product, if the laser printing instead of ink printing high-definition, never fade, difficult to counterfeit, environmentally friendly, with international popular new trend. The optical fiber lasers developed by scientists in Shanghai have led to a new step in the output of optical fiber laser output, with a maximum output of 107W, which is far ahead of the national team.

In 2004, nankai university reported the peak power of 206kW at the same time.

On December 3, 2004, balefire communication, following the launch of the laser output power of 100 w above after double cladding ytterbium doped fiber, after painstaking research record, the output power of this new type of optical fiber has been successfully up to 440 w, reached the international leading level.

This is a significant step in the field of special fiber optics and is a major breakthrough in the field of high power laser fiber optics. Ytterbium doped double clad fiber laser is the recent development of a new type of high power laser devices, since it has good beam quality, high efficiency, easy to heat dissipation and easy to realize high power and other characteristics, has been developing rapidly in recent years, and has become a high-precision laser processing, laser radar system, in the field of optical communication and target designation important candidate of coherent light source. The main laser gain medium doped with ytterbium laser is double-clad layer doped with ytterbium optical fiber, so the performance of the double-clad layer doped with ytterbium fiber directly determines the conversion efficiency and output power of the laser. Balefire communication as the only domestic double cladding ytterbium doped fiber research unit, the successful launch of output power of 100 w above can be completely commercial double cladding ytterbium doped fiber products, and increase the intensity of research and development, make its reach over 440 w power output, reached the international leading level.

In short, the optical fiber laser is the representative of the third generation laser technology, and has the technological superiority of other lasers. But, at least in my view, in the short term, optical fiber laser will mainly focus on the high-end application along with the popularity of fiber laser, cost reduction and the improvement of production capacity, will eventually may replace the global most of the high power CO2 laser and the vast majority of YAG laser. At the same time, I hope this article can be of great reference value to readers.