|
|
|
|
|
|
|
|
|
|
Countries to reduce the fiber raw materials import tax rate of fiber laser will benefit
|
|
Last year, Wuhan Yangtze optical fiber production customs received leading enterprise requirements, careful investigation and foreign enterprises and domestic market situation, Wuhan Customs to the superior department proposed the "lower import quartz glass tube of the provisional tax rates, the abolition of the optical fiber preform provisional tax" proposal. Yesterday, Wuhan Customs introduced, this proposal was adopted, the National Tariff Commission this year, the country will import quartz glass tube of the provisional tax rate reduced from 3% to 1%, and cancel importing optical fiber preform and 4% of the provisional tax rate, to restore it to 6% of the MFN tariff rate.
Wuhan Customs estimates, only import quartz glass tube of the provisional tax rate reduced from 3% to 1%, Hubei enterprises imported quartz glass fiber pipe can save tens of millions of tax cost, and manufactured goods tax rates revert the most favored nation tax rate of 6%, will also promote the "made in Hubei" to keep the domestic market share.
Wuhan Customs introduced, fiber industry in Hubei province is the key industry, optical fiber and cable production scale ranks second in the world, the domestic market share of more than 50%, international market share of 12%; optoelectronic devices, laser products in the domestic market share of 40%, occupies a place in the global industrial division of labor. However, fiber Hubei enterprise's raw material of quartz glass tube mainly rely on imports of manufactured goods, and the optical fiber preform is mainly the supply of the domestic market, in the fierce competition in the market, suffered a raw material import tariffs on manufactured goods, the import tariff is low predicament, by day, the United States and other similar enterprises extrusion.
"Core fiber laser"
Since the advent of high power fiber lasers, fiber lasers have become one of the most active research direction of the laser field. With the further development of high power semiconductor laser using and new pumping technology manufacturing industry mature, fiber laser has been the rapid development. Compared with traditional solid state laser, high power fiber laser has the advantages of simple structure, low threshold, good heat dissipation, high conversion efficiency, good beam quality etc.. At present, was of great concern to the majority of the work of scientific research and industry experts.
Fiber laser with fiber Bragg grating as cavity mirrors can be, in order to achieve all fiber structure. The pump light from the left mirror coupled into the gain fiber, pump power in the cladding multiple reflection through the doped core, choose the appropriate concentrations and other parameters of fiber has enough length and doping ions doped ions, such can be fully absorbed pump light. The fiber laser cavity resonator device of a waveguide type, light transmission and bear by the optical fiber, the structure is actually Fabry-Perot resonant cavity structure. Fiber laser is actually a wavelength converter. In the pump wavelength photons are medium absorption, the formation of particle number inversion, and finally producing stimulated emission and laser output in the doped fiber medium.
All fiber lasers requires the use of double clad active fiber, double clad photosensitive fiber, the energy transmission optical fiber and other specialty optical fiber, with the output power increases, the requirements of the special optical fiber technology is also more and more high, therefore, the development of special optical fiber will play an important role in the development of fiber laser. The photonic crystal fiber as the representative of a new generation of special fiber will gradually be applied in the development of fiber laser. The development of special optical fiber, will enable the active optical fiber, high gain, power density under greater, the pump light absorption is more efficient; will make the grating fabricated more easily and better stability of the grating, grating in fiber laser of wide application; the energy transmission optical fiber is capable of higher power transfer the high power laser can be transmitted over greater distances, capable of transmitting wavelength range and continuously expand; will make the pump coupling more easily and pump power can withstand higher, less wear.
At present, although our country conventional single-mode capacity achieved a historic leap and progress. However, in the economic globalization today, the conventional single-mode fiber intensified competition. In addition to the developed countries will be the transfer of manufacturing to China, the real environment is accelerating the national optical industry competition. The state cancel and reduce import tariffs part of fiber raw material, reducing domestic fiber production costs, to promote has a very big role in promoting national fiber enterprises to enhance independent research and development level.
|
|
|
|
|
|
|
|
|
|
