Application of pure silica glass fiber
AddTime£º07-10-2016 Author£ºadmin
According to different purposes, the following by the sea as optical communications equipment company to introduce you to the pure silica glass fiber can be applied to the following aspects:
Industrial optical fiber
Pure silica glass fiber and industrial laser facilities for processing, drilling, cutting, welding, etc.. As the laser power is larger, so you need to use a single pure quartz glass fiber, and core diameter not less than 300um, the transmission power between 100 ~ 150W, end cloth fiber required by high temperature special treatment. Pure silica glass fiber provides a flexible and convenient means of light transmission for industrial lasers.
Two, medical optical fiber
Optical fiber has become a key component in many medical diagnostic and therapeutic devices. Because the pure silica glass has the advantages of low price, high laser damage threshold, high strength and high reliability, it has become the preferred optical fiber in medical field. Especially in the laser transfer system, it is not belong to him. It can be made of laser surgical endoscope, its delicate dexterity, the doctor can conveniently and accurately treat the body in the treatment of fiber in vitro, in order to human safety requirements, laser treatment principle of the human body, pure quartz glass also show their skills in the application stage here.
Three, measurement of optical fiber sensor
Because the pure silica glass fiber with diameter, light weight, flexible, anti electromagnetic interference, high temperature and radiation, good electrical insulation properties, so use in measurement of the wide, this kind of pure quartz glass fiber products by single or multiple (a) made of pure quartz glass fiber. A combination of the fiber bundle structure with different application occasions and change the face usually arranged in a circular shape or geometry shape, distance.
Four, spectral analysis with optical fiber
In recent years, the fiber in the laboratory also display skills to the full. The spectral region by pure quartz glass fiber allows information from the ultraviolet to the near infrared is very wide, infinite measurement method is very suitable for spectrum measurement, such as absorption, emission, emission, stimulated emission and Raman scattering. This kind of pure quartz glass fiber products are usually used to single quartz glass optical fiber laser or other light to send the test sample, one or a plurality of reflection quartz glass optical transceiver to collect reflection, radiation or fluorescence, the return light to the test to analyze. This kind of measurement technology provides the basis for many chemical analysis.
Characteristics of rare earth doped silica glass fiber
With the development of integrated optics and optical fiber communication, there is a need for micro lasers and amplifiers. In 1990s, put forward higher requirements for the transmission of information highway information, multimedia technology can also transmit figurewords sound like, and is of high speed and this far, with super high speed, high-speed highway transmission, but the speed and the optical fiber communication technology to transmit information in general what is required far. In the ultra high speed and long distance transmission of information need to cross many technical failures, one of which is how to add in the long distance transmission process of the attenuation of light energy. Therefore, the direct amplification of optical signal becomes a very important issue. Rare earth doped fiber amplifier to amplify the signal directly, is conducive to large capacity, long distance communication will enable more rapid development of optical fiber communication.
Commonly used with the rare earth dopant in quartz fiber doping, the doping agent commonly used are: (Yb), erbium ytterbium (Er) and neodymium (Nd) and TM (Tm), cerium (Ce), PR (PR), samarium (Sm) and europium (Eu), terbium (Tb) ho, (Ho), La (La) and other rare earth elements.
From the analysis of rare earth elements, the application of rare earth ions in the field of optical applications has a long history. Rare earth turnover has important properties different from other optically active ions, the light emission or absorption is very narrow, the relationship between emission and absorption wavelength and materials not leap, transition strength is very weak, long lifetime metastable, high quantum efficiency. These properties make the rare earth ions have a very important role in many optical applications.
From the atomic structure, rare earth elements have the same outer electron shell structure, namely 5S - 5P - 6S - 5P * fand full shell structure is. Rare earth ions are usually in trivalent state of ionization, other electronic structure for {Xe}4f's 5S - P as upsilon + fand 6so fand 4f and 6S respectively, lost 1 and 2 electrons, and 5S - and 5p + fand fand were not changed. Because the N-1 inner 4f electron residual due to 5S, 5p with a shell layer shielding effect, makes the spectral characteristics of f-4f transitions (such as fluorescence and absorption properties) are less susceptible to the host glass field, so the rare-earth element doped solid-state laser material f to produce the intensification of linear 4f and sharp transition. Doped with rare earth ions in the host lattice glass bound by electric field and the formation of the rare earth ion Stark division, at the same time between these splitting due to phonon caused by energy exchange and annihilation, the energy from the surface of the homogeneous or inhomogeneous broadening. When the particle is sharpened to a level with the pump, to non radiative transfer to pump the way between the belt and the baseband level, and a longer stay in the level, the formation of a laser system instead of particle number distribution. This energy level is the upper level of the laser, which is also called the metastable energy level. The lifetime of the laser is longer than that of other high energy and non radiative lifetime.