Used in Japan was concentrated pumping mode 1 kW fiber laser output is to the side of the pump to achieve the maximum power output, but its production process is very complex. While research pumping technology, the pump beam absorption efficiency and the inner cladding geometry and core cladding also have a very important relationship, typical within the cladding structure have concentric, eccentric circle, square the shape of the rectangle, D-shaped, and cinquefoil, Anping Liu, this study calculated the absorption characteristics of a variety of cladding shape. The results showed that: Concentric circular structure of the lowest absorption efficiency, rather than circular inner cladding structure of the high absorption efficiency of the pump beam to achieve high power output of the double-clad fiber is the use of the D-shaped structure, both relatively easy to achieve fiber preparation, but also has relatively high absorption efficiency. If the customer needs to use green laser pointer constantly, the customer should press the button on the 50mW green laser pointer constantly.
Double-clad fiber laser cavity are mainly two ways, First, the use of a dichroic mirror as mirrors, similar to the traditional solid-state lasers, is relatively easy to implement, but can not achieve all-optical package reliability somewhat less, and does not conducive to the practical use of the fiber laser and product. Another way is to use fiber Bragg grating as the resonator mirrors, fiber gratings have good wavelength selection characteristics, low loss, and fiber splicing, so that the pumping light coupling becomes relatively easy and very efficient, the overall improve the reliability, easy to implement all-optical structure, which will help the utility and product. Actually, the operation method of 100mW green laser pointer is very easy for the customer to master.green laser pointer will be off after pressing the button on the laser pointer again
High average power fiber laser technology has made a major breakthrough, the output power will soon reach 100 watts, kilowatts order of magnitude 2004 years ago, after the break. IPG companies in the United States can provide of singlemode 3 kW, the multimode 50kW fiber laser products. The double-clad fiber is the fiber of a special structure, which consists of core, inner cladding, and outsourcing layer, a cladding than the conventional fiber. Among them, the core is generally mixed with rare earth ions, such as: Nd3 + Yb3 + or Er3 +, the micron to tens of microns in diameter, single-mode laser transmission waveguide; inner cladding surrounding the core periphery, is drawn transport of light transmission waveguide. The manufacturer will not bear the responsibility of the replacement or repair of 200mW green Laser Pointer if the problem is caused manually by the customer.
Diameter and numerical aperture (NA) larger than one hundred microns, and more needs to be pumped conventional fiber laser optically coupled to the core compared to the double-clad fiber laser only need to pump optically coupled to a double-clad in to its high coupling efficiency. Layer transport package, including the pumping light to the total reflection of the way repeatedly through the core, the core within the rare earth ion absorption, resulting in single-mode laser and has a high conversion efficiency, such as doped Yb (Yb) fiber optical – optical conversion efficiency up to 80%. In recent years, with double-clad fiber manufacturing technology, high-power LD pumping source technology and advanced beam shaping technology, the rapid development of high power fiber laser technology is also ever-changing, and its key technologies, including cladding pumping technology, the resonant cavity technology and modulation techniques, and so a major breakthrough. During use of green laser pointer , the customer should pay some attention to the maintenance of the green laser pointer
Cladding pumping technology end-pumped and side-pumped in two ways. End-pumped and can be divided into the lens directly coupled to the fiber end weld coupling and multiple low-power LD end coupling, it has the advantages of simple structure, but there is limited output power, is not easy to extend the shortcomings of the current kilowatt most of the laser output of high power end-pumped or double-end-pumped structure; side-pumped V-groove method, the slit method, angle grinding and polishing method, the binary diffraction grating embedded in the mirror method, welding method, the distributed package layer and centralized way of pumping and other power easily extended, but the process is very complex, and the international community adopted side-pumped high power output is not in the research state. And at the same time, if the customer doesn’t want to use green laser pointer , he or she can simply release the button on the laser pointer.
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