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Nd: YAG laser with its high gain, low threshold, high quantum efficiency, thermal effects are small, good mechanical properties, suitable for a variety of operating modes (continuous, pulse), etc., in today's application of a variety of solid-state laser material interaction effect is different, different wavelengths of Nd: YAG laser using a continuous, pulse, etc. working in different parts of the laser and the interaction of biological organization, you can get a good effect. Medical Nd: YAG laser in surgery, ophthalmology, dentistry, dental, ENT, dermatology, beauty, etc. are widely used, especially the treatment of skin pigment disorders, there is trauma, healing, and no scars and other unique advantages . The used can simply press the related buttons on   

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   This paper describes the Nd: YAG laser characteristics and treatment of skin diseases in the application, so that readers understand the performance of a variety of lasers and laser treatment for different types of treatment. A, Nd: YAG laser to produce laser systems feature, called laser. Laser is usually a simple matter by the work, the pump source and the resonator consists of three parts. Since the birth of the first laser in 1960, there have been hundreds of lasers come out. All kinds of great differences between laser, laser-generated work based on the material, a gas, liquid, solid and semiconductor lasers. Solid-state lasers based on solid-state mixed with a small amount of active matrix elements for the work of the laser material, work material depends on the physical and chemical properties of the matrix material, and its spectral characteristics mainly by the light particle energy level structure of the decision. Users only need to press the arrow key on  

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    with remote control.However, light particles by the matrix material impact on its spectral characteristics will change, and some even changed greatly. Matrix are used as corundum, garnet crystals and all kinds of glass. Light particles known as active ions, the most commonly used for the activation of neodymium ions, chromium and other rare earth ions. For example, the world's first working laser material used for the ruby, is mixed with a very small amount of chromium ions in corundum. Mixed with a certain amount of neodymium ions in (Nd3 +) in yttrium aluminum garnet (YAG) laser crystal material for the work, known as neodymium-doped yttrium aluminum garnet (Nd: YAG) laser. Neodymium laser is currently the most widely used one solid devices, laser processing, medical, military and other fields are widely used. Figure 1 Nd: YAG energy level diagram of Nd: YAG laser for the four-level system, a number of fluorescence spectra at room temperature. Users can obtain fantastic convenience with 

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    with remote control.Under normal operating conditions (room temperature) laser oscillation wavelength of 1064 nm strongest simplified energy levels shown in Figure 1. If the insert cavity dispersion prism or etalon, or a specially designed cavity mirrors as the output mirror, the use of dielectric film coated with a highly selective mirrors, curb unwanted wavelengths of laser oscillation, get the required wavelength of the laser transition, such as 1319 nm, 1338 nm, 946 nm and so on. Output wavelength of 1064 nm Nd: YAG laser, after frequency doubling (KTP) crystal can produce a wavelength of 532 nm laser. Output light has a continuous, quasi-continuous form. Nd: YAG Nd3 + concentration should be mixed with a reasonable, high doping concentration, the absorption rate, high population inversion, laser efficiency, but the doping concentration is too high, the conversion efficiency is not only not increased, but will decline, and even the phenomenon of concentration quenching.  

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     with remote control can used as the flash disk.Nd atom concentration is generally less than 015% to 115%, the higher the concentration of the fluorescence lifetime will be shortened, so that line broadening broadens, causing strain in the crystal, resulting in deterioration of optical quality, and reducing efficiency. Applications, may need to select the appropriate doping concentration, thereby enhancing the performance of the laser, Q-switch 3 for the operation, select the high concentration of doping agent (112%), to produce high energy; for continuous operation, is usually low concentrations doped agent (015% 018%), to obtain good beam quality. The size of the gain medium is usually selected based on the laser gain, high-gain large selection of YAG laser rod, length 150 mm, low-gain lasers often choose short laser rod, a few millimeters or more than ten millimeters, too long laser rod is not only not improve the gain, but because of the absorption loss and other factors reduce efficiency. It is the torch-like   green laser pointer     .

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