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Laser cladding of high hardness, wear resistance and high temperature resistant coating characteristics, in order to prevent the parts working in the high speed, high temperature and high pressure and corrosive environment for local surface damage and scrap, improve the service life of the parts, all the countries in the world are committed to developing a variety of improved component surface performance technology. The traditional surface modification technology (such as spraying, spray plating, surfacing and so on) is not ideal because of the poor interlayer bonding force and the limit of the solid diffusion difference. The appearance of high power laser pointer and wide-band scanning device provides a new effective means for material surface modification. Laser cladding is a new surface modification technology with high economic efficiency. It can produce high performance cladding layer on cheap and low performance substrates, thereby reducing material costs, saving valuable rare metals and improving the service life of metal parts.

In modern aircraft manufacturing, titanium alloys and aluminum alloys are widely used. For example, the fourth generation fighter F-22 of the US has reached 41% of the body titanium alloy, while the amount of the advanced V2500 engine titanium alloy has reached 30%. Titanium and titanium alloy with high specific strength, excellent corrosion resistance, good heat resistance, can reduce body weight, improve performance. The defects of titanium alloys are low hardness and poor wear resistance. The hardness of pure titanium is 150 ~ 200HV, and the titanium alloy is usually not more than 350HV. In many cases, due to the formation of a dense oxide film on the surface of titanium and titanium alloy, it will play a role of anti-corrosion. However, when the oxide film ruptures, the environment is bad or crevice corrosion occurs, the corrosion resistance of titanium alloy will be greatly reduced.

The microhardness of the surface of the titanium alloy by laser cladding is 800-3000HV. The surface enhancement of aluminum alloy surface by green laser cladding is an effective method to solve the problems of poor wear resistance and plastic deformation on the surface of aluminum alloy. Compared with other surface strengthening methods, the method has metallurgical bonding characteristics between the reinforced layer and the aluminum matrix, and the bonding strength is high. The thickness of cladding layer is up to 1 ~ 3mm, and the microstructure is very small. The cladding layer has high hardness and good wear resistance, and has strong bearing capacity, so as to avoid cracks produced by the incompatibility between the soft matrix and the strengthened layer. In addition, the high performance ceramic coating on the surface of titanium alloy and aluminum alloy can be greatly improved with the wear resistance and high temperature resistance of the material.

In recent years, aviation gas turbine engine to high flow ratio, high thrust weight ratio and high inlet temperature in the direction of the combustion chamber, gas temperature and gas pressure increasing, such as military aircraft engine turbine inlet temperature has reached 1800 degrees Celsius, the temperature of the combustion chamber to reach 2000 to 2200 DEG C, so the high temperature has exceeded the existing high temperature alloy the melting point of. In addition to improving the cooling technology, the preparation of thermal barrier coatings made on the surface of high temperature alloy hot end components (Thermal Bamer Coating, TBCs) is very effective, it can reach 1700 DEG C or higher insulation effect, to meet the high performance of the engine should reduce the service force and material requirements of stability induced by temperature gradient and heat.

Since 1980s, laser cladding ceramic layer on material surface has obtained dense columnar crystal structure and increased strain tolerance. Dense and uniform 5mw laser pointer remelting microstructure and lower porosity can reduce the oxidation rate of the adhesive layer and prevent the penetration of corrosive medium. A high-power laser can be used to directly radiate ceramic or metal powder, melt it and form metallurgical bonding on the metal surface to obtain columnar crystal structure perpendicular to the surface. Because the order of solidification of the cladding layer is relatively small from the surface to the inside, so the structure is conducive to mitigate the thermal stress. For example, 8% (mass fraction) yttria partial stabilized zirconia (YPSZ) thermal barrier coating is obtained by laser cladding. Can also be placed in a uniform matrix mixed powder, mixed powder by high power laser radiation, the formation of molten pool by adjusting the laser power, spot size and scanning speed of the powder melting is good, and on this basis further by changing the composition into the molten pool constantly adding alloy powder, repeating the above process can obtain the gradient coating.

Laser cladding super abrasive and corrosion resistant alloy on the surface of key components can improve the service life of components and shorten the manufacturing cycle when the parts are not deformed. The thermal barrier coating produced by 500mw laser pointer cladding has good thermal insulation effect, which can meet the requirements of high performance aero engine to reduce temperature gradient, thermal induced stress and service stability of matrix materials.

Compared with the traditional processing technology, fiber laser cutting machine in the production of food machinery in the outstanding advantages. The traditional processing methods need to open mold, stamping, cutting plate, bending and other links, low efficiency, mold consumption, the use of high cost, seriously hindered the pace of food machinery industry innovation and development.

Laser processing in the application of food machinery has the following advantages: safety and health, red laser pointer cutting is a non-contact processing, which is very clean, suitable for food machinery production; cutting slit, laser cutting of the slot is generally 0. 10 ~ 0.20mm; cutting surface smooth, laser cutting cutting surface without burrs, cutting all kinds of thickness of the plate, and the truncated surface is very smooth, no secondary processing to create high-grade food machinery; speed, and effectively improve food machinery production efficiency ; Suitable for large-scale processing of products, large pieces of mold manufacturing costs are high, laser cutting without any mold manufacturing, and can completely avoid the formation of the material when the collapse of the pile, a significant reduction in production costs, improve food machinery Grade. Very suitable for the development of new products, once the product drawings, immediately after the laser processing, in the shortest possible time to get new products in kind, effectively promote the upgrading of food machinery. Saving materials, laser processing using computer programming, can be different shapes of products for the material cut, to maximize the utilization of materials, reduce the cost of food machinery production.

With the gradual popularization of laser cutting machine, the market demands to further improve the cutting efficiency (high speed cutting), reduce the standby time (automatic feeding and unloading system), expand the application area, reduce operating costs, etc.. The green laser and computer numerical control technology, advanced optical system and automation and high precision T positioning combined automatic discharging, cutting process database, remote diagnosis and remote control are integrated, the features of laser cutting and other processing methods, such as laser punch made of multi function processing machine the factory complex needs efficient processing, it has the versatility of laser cutting and other processing in the form of high speed and high efficiency characteristics, can be completed at the same time cutting, drilling, marking, scribing, forming etc..

Laser cutting is a kind of high energy density controllable non-contact processing. It focuses the laser beam into a spot with a minimum diameter of less than 0.1mm, so that the power density at the focal point can exceed 107W to 108W / cm ~ 2. The irradiated material is quickly heated to the vaporization temperature and evaporated to form pores. As the beam moves relatively linearly with the material, the apertures are continuously formed with slits of about 0.1 mm in width. The cutting also adds auxiliary gas to the material to be cut to accelerate the melting of the material, blown away the slag or protecting the slits from being oxidized. Many metal materials, no matter what kind of hardness, can be used for laser deformation without cutting. Most organic and inorganic materials can be laser cut.

Compared with the traditional plate cutting method, laser pointer cutting has obvious advantages. It is easy to cut fast, high production efficiency; cutting quality is good, slit narrow; material adaptability, no tool wear; whether it is simple or complex parts, you can use a laser precision forming rapid cutting; high degree of automation, Low labor intensity, no pollution; low production cost, good economic efficiency; the effective life cycle of the technology is long.

Laser since the middle of the last century was born, is no longer confined to the laboratory, but further to get in by every opening of human production and life, both in the industrial manufacturing field, or health care, entertainment and other industries, "meet the eye everywhere examples of laser life changing". Sometimes, the laser is far beyond the horizon of ordinary people, such as laser weapons on the battlefield, remote laser welding in automobile manufacturing, laser processing of solar cells, etc.. Sometimes, it is everywhere, such as supermarket bar code laser scanning, home fast broadband optical fiber network, the show on the bizarre blue laser pointer dance etc.. For ubiquitous lasers, humans seem to be familiar with the application.

With the rapid development of sheet metal processing technology, processing technology is also changing, to the sheet metal processing has brought many revolutionary ideas. As a traditional sheet metal cutting equipment, are: CNC shear bed, punch, flame cutting, plasma cutting, high pressure water cutting.

These devices in the market occupies a considerable market share, one of them familiar, two cheap, although they are relative to the most powerful laser cutting and other modern technology is very obvious disadvantage, but they also have their own unique advantages. CNC shearing machine because it is mainly straight cut, although the knife can cut up to 4 meters of the plate, but it can only be used only in the need for straight-cut sheet metal processing. Generally used in the plate after the flat cut, etc. only need to cut the industry in a straight line.

High pressure water cutting is the use of high-speed water jet cutting of sheet metal doped corundum implementation, it almost no restrictions on the material, the cutting thickness is almost up to 100mm or more, easy to burst with Thermal Ceramics and glass cutting material can be cut, such as copper and aluminum can be cut by laser reflection materials and laser cutting water jet, there is a greater obstacle. The disadvantage of water cutting is that the processing speed is too slow, too dirty, not environmentally friendly, and consumables are also higher.

Laser cutting is a process revolution of sheet metal processing, and it is a machining center in sheet metal processing". Laser cutting has a high degree of flexibility, cutting speed, high production efficiency, short product cycle, and has won a wide market for customers. Laser cutting and no cutting force, no deformation; no tool wear material, good adaptability; whether it is simple or complex parts, can be cut with a precision of blue laser pointer rapid forming; the narrow kerf, good cutting quality, high degree of automation, simple operation, low labor intensity, no pollution; can realize automatic cutting like, nesting, improve material utilization, low production cost, good economic benefit. The effective life of the technology, at present the ultra sheet 2 mm is mostly used in laser cutting, many foreign experts agreed that the next 30-40 years is the golden period of development of laser processing technology (is the development direction of sheet metal processing).

Cutting accuracy is the first element to judge the quality of laser cutting machine. The four factors that affect the cutting accuracy of a laser cutting machine are the size of the laser agglomeration of the laser generator. If the spot is very small after the gathering, the cutting accuracy is very high, if the gap after cutting is also very small. It shows that the precision of 300mw laser pointer cutting machine is very high, the quality is very high. But the laser beam emitted by the laser cone, so cut out the gap is also cone. Under such conditions, the greater the thickness of the workpiece, the accuracy will be lower, so the greater the gap.

Accuracy of the workbench. If the precision of the table is very high, the accuracy of the cutting is improved. So the precision of the workbench is also a very important factor in measuring the accuracy of the laser generator. The laser beam is condensed into a cone. When cutting, the laser beam is tapered down, then if the thickness of the workpiece is very large cutting, cutting the accuracy will be reduced, then cut out the gap will be very large. Cutting the different materials, will also affect the accuracy of 100mw laser pointer cutting machine. In the same circumstances, cutting stainless steel and cutting aluminum its accuracy will be very different, stainless steel cutting accuracy will be higher, and the section will be smooth.

In this study, a cadmium sulfide (CdS) line with a diameter of 204 nm and a length of 15 μm was used as the core design of the optical cavity (Fig. 1). The high refractive index of the nanowires causes the incident light to have a high reflectivity factor at the end face and be guided by the nanowires. This arrangement forms the Fabry-Burrow cavity, which, when activated by an external light source, forms a laser. The laser wavelength thus formed depends on the refractive index around it. By measuring the wavelength of the most powerful laser output, the refractive index of the liquid immersed in the nanowires can be determined.

There are a variety of methods for surface nanocrystallization of materials. There are a large number of surface nanocrystallization technologies. It is a surface layer which can realize the nano-characteristics by means of laser surface treatment technology and nanometer technology. It can be collectively referred to as laser surface nanocrystallization technology; More generally referred to as laser nano-surface engineering technology, is directly or mainly the use of laser this specific technical means to directly change or add material to change the surface of the solid material is treated, the composition or structure, so that the formation of nano-crystal Grain or a certain nanoparticle composition of the surface layer. Or the use of laser etching, laser embossing, laser hair, laser micro-nano modeling and other means to achieve nano-structure on the surface of the material.

In the 1970s, after the successful development of high-power lasers, blue laser pointer surface treatment technology into the practical application, and then the rapid development, there have been laser quenching (laser phase hardening surface modification technology), laser remelting, laser surface alloying, Laser cladding, laser surface amorphization and laser shock enhancement. These laser surface treatment technology through the surface of the material to form a certain thickness of the treatment layer to improve the mechanical properties of the material surface, metallurgical properties, physical properties, thereby enhancing the parts, the workpiece wear, corrosion resistance, fatigue and other properties. Laser due to high power density, good direction, energy transfer convenience, can be transmitted in a variety of transparent media and other characteristics.

Generally refers to the use of laser remelting, high-energy 300mw laser pointer surface melting and not add any other ingredients to the substrate surface rapid melting and solidification grain refinement, eliminate defects, reach the aim of improving the surface structure. Laser remelting as a kind of surface engineering technology, a large number of researchers have done related research work, pointed out that the research can significantly improve the surface hardness and corrosion resistance of the material and wear properties by laser remelting, but as the surface of nanometer technology is not clearly separate.

Laser cladding, also known as laser cladding or laser cladding, laser irradiation and laser remelting, are directly treated with matrix material without the addition of other materials, but laser cladding is achieved by adding a clad material to the substrate surface and using high Energy density of the blue laser pointer beam, so that with the substrate surface layer of the method of melting together, in the formation of the base layer with its metallurgical combination of filler cladding.

Laser cladding surface nano-technology can be divided into three main aspects, the first aspect is the use of similar laser remelting surface nano-method, take appropriate measures directly in the laser cladding process to make the deposited layer of nanocrystalline structure. There are two types of this method, one is the melting material and the substrate composition is basically unchanged, the formation of laser cladding pool and the formation of cooling to the main physical process, this method is currently relatively rare literature. The other is in the laser cladding process between the melt and the substrate, or between the welding material and the deposition of chemical reaction between the formation of nano-particles or nano-size organization.

Laser shock peening (LSP) is a kind of high and new technology to improve the fatigue, wear resistance and corrosion resistance of metal materials by using plasma shock wave produced by most powerful laser beams. The impact of laser surface nanocrystallization technology as shown in Figure 6, when the short pulse (NS) high power density (GW/cm2) of the laser irradiation to the metal surface absorption layer, absorbing layer to absorb laser energy explosive vaporization, high pressure (GPa) plasma, the plasma is constrained layer constraint, produce high impact wave effect on the metal surface and to the internal communication, the formation of dislocation structure dense and stable on the surface of the material, plastic deformation by dislocation slip, and the shock wave at the grain boundary reflection and refraction, the shock wave in multi direction effect on grain, thus the complexity of the dislocation slip, agglomeration and annihilation after the formation of new grain boundary, sub grain formation and smaller nanocrystals.

Researchers at the University of Rochester in New York have developed an extraordinary new surface material by bombarding ordinary metals with femtosecond 300mw laser pointer pulses, which can effectively absorb light, water and self-purification. Through the super-laser pulse in the metal surface etching a large number of naked eye, such as pits, beads and fine lines and other "traces", these traces of the formation of dense distribution and uneven nano-microstructure. This nanostructure fundamentally changes the optical properties and wetting properties of the metal surface.

The application of surface treatment technology has a long history, but the surface engineering technology from concept to become a complete system of time subject to, but now only a few decades, laser surface nanocrystallization technology of laser technology and nanotechnology and surface engineering technology combined or can also be called laser nano surface engineering technology.

Although the use of a variety of laser surface treatment technology, such as laser irradiation, laser remelting, laser cladding and 100mw laser pointer shock, has a lot of research materials and achieved fruitful results, but specifically targeted for the use of these technologies, The research on surface nanocrystallization is still relatively small and not systematic, and the development of nano-patterning of laser surface is still in the early stage, so there is still a lot of research work in this field.

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White light laser light source, short-wave laser light source and super-continuous laser light source compared to ordinary white light source (such as sunlight, incandescent, white LED lights, etc.), with high brightness, peak power, frequency coverage and other advantages, Research, defense, military, lighting, communication technology, information technology, industrial production, biomedical, environmental testing and other fields have a wide range of practical application value, received a strong concern.

White laser pointer as a new laser light source, with good direction, high energy density, super continuous spectrum, great bandwidth, flexible and diverse center wavelength, a high degree of time and space coherence and other advantages, Greatly expand the function and application of laser technology. White light laser or solar laser is completely coherent light of time and space, not only the laser beam is highly collimated, does not diverge, but also can focus on the very small area; between different colors and phase completely locked, by regulating these amplitudes and phases, can be arbitrary To change the time of the laser pulse shape, resulting in a very short pulse width (femtosecond and sub-femtosecond) laser pulse. Such a solar laser would have the potential to achieve the dual effects of focusing and convergence of light energy on time and space, releasing energy in tiny regions and extremely short periods of time, resulting in extremely high instantaneous power densities.

Laser has been widely used in basic scientific research, including physics, chemistry and materials science in many areas, need to laser and material interaction, to obtain the microscopic world of material information to understand the atomic, molecular and solid, liquid and other materials Material state and attributes, so as to achieve the goal of understanding and applying the microscopic world. Unlike conventional conventional lasers, white lasers have supercontinuum, ultra-wideband, completely coherent properties that make them play an important and irreplaceable role in many areas where ordinary blue laser pointer power can not be achieved. This application focuses on many domestic and foreign research universities and research institutions, economic and social benefits is very impressive.

Like ordinary lasers, white lasers can also be used in life science research and biomedical diagnosis and treatment. For example, as precision spectroscopy, ultrafast dynamic detection, confocal microscopy, flow cytometry and other technologies used in protein macromolecules physiological function of the study, the use of optical coherence tomography, Raman spectroscopy, nonlinear spectroscopy As a biomedical disease diagnostic tool; also as an increasingly popular tool for laser beauty, laser medicine, light and heat treatment. As a supercontinuum, ultra-wideband, the center wavelength adjustable white laser pen in many areas have a unique advantage.

Laser is both a carrier of information and a carrier of energy. Both features can be found in the defense and military areas of many applications. As a carrier of energy, lasers can be used in the manufacture of active infrared imaging and night vision, and can also be used as laser weapons with high directional energy for laser confrontation. In addition, you can use the principle of photoelectric effect, the use of small and medium energy laser on the enemy's satellites, missiles, aircraft and other flying objects sensitive components of green laser pointer damage and damage, in order to achieve the purpose of destroying enemy military targets. In this respect, ultra-continuous, ultra-wideband, high-power white laser has a unique advantage, because its photoelectric effect frequency window is huge, it is easy to a variety of optical sensitive devices (usually a kind of optical device has a sensitive wavelength) And chemical reactions. In addition, the white laser peak power is huge, and when the interaction with the optical sensitive devices resonate, will have a huge damage effect. This technique is particularly suitable for interference and destruction of enemy satellites.

Laser holography is a technique that uses a wide range of information to record and reproduce the shape of an object. The principle is to use the laser interference effect, in principle, to record all the information of the object (visual and dark information (ie, reflected amplitude information) and phase information ). The typical application is laser anti-fake and laser scanner (ultrasonic bar code used), ordinary holographic film using monochromatic laser to produce holographic stripes, if you can use color red laser pointer or white laser to produce holographic interference fringes, in principle, not only can reflect the object Contour information, and can reflect the color information. This is a true object of all-round information recording and reproduction technology. The technology not only greatly improved the amount of information contained in the holographic film, improve the reliability of laser anti-counterfeiting, increase the difficulty of information is cracked, and can truly reproduce the three-dimensional information and color information.

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Russia will restart the high powered laser weapon program of Soviet era to put it into the modern war. Under the circumstance of laser weapons are highlighted by the United States and China, Russia make a decision to resume the Soviet Union military laser pointer program. However, it was only intended to be used in space, because it is too expensive to use as an air defense missile.

In 1973, the related 10000mw Laser weapons were tested for the first time. The person in charge of this project, Nicola Basov, finally won the Nobel prize for "basic research in the field of quantum electronics which led to the advent of the burning laser principle". Laser weapons were developed under his leading and these laser weaons reached a specail level that could destroy ballistic missiles easily. Terra-3 lasers were tested in Kazakhstan. At that time ,Soviet defense minister Andre Grechko visited the scene and witnessed how the laser weapons destroyed 5 coins kopecks.

The US Navy recently announced that a 300mw Laser weapon system named LaWS was deployed successfully, which have passed all tests. It has been on duty since December 2014. The power of the system is still very low. Russia's strategic and technical analysis center expert Cashin pointed out that the LaWS can only deal with small unmanned aerial vehicles or boats.

In addition, Alexander Prokhorov who had worked together with Nicola Basov developed high powered burning laser weapon. This carbon dioxide 100mw Laser weapon capable was so powerful that could destroy missiles and aircraft. At first, the device can not be moved, but after a series of successful trials, it could be moved freely, but the price was still stay expensive. Even so, the 2 projects kept receiving funding until the collapse of the Soviet union. After that, the Technology Department moved to Moscow, the test site and all the facilities remained in Kazakhstan after its independence. Today, the advanced military facilities have been turned into a piece of rubble,and can not be re-used.

Compared with the ABL, burning laser Weapon will encounter many technical difficulties, if the power density is unable to meet the demand, it is likely to face the fate of stillborn.The U.S. missile defense agency is continuing develop the technical high power laser weapons investment.In fiscal year 2019, the defense agency will select one of the most successful type, according to the proportion.It is reported that, if the deployment of laser weapons successfully, anti missile UAV Will take the boost phase missile task.At present, the directional director of the U.S. missile defense agency James Sunning said that the current UAV laser anti missile boost phase development problem is to improve the power to weight ratio, in order to make it stronger

.In 1962, at Lawrence Livermore National Laboratory in California, physicist John Nuckolls proposed using high powered laser to achieve controllable nuclear fusion.Since then, the Lawrence Livermore laboratory has been pursuing this concept, the power of the laser they used were also growing. This is a complex system that can be issued at the same time. National ignition device is developed by the United States scientists, it was the world's largest laser nuclear fusion device. It is reported that this is known as "artificial sun" device which can produce similar stellar core temperature and pressure.

In industry, the 200mw Laser Pointer is used as a saw and a drill.People tend to use laser to machine high hardness materials, such as diamond, or baby pacifier.Low power lasers can be cut and welded plastic; high power lasers can cut and weld metal. Early industrial lasers must have very large figure in order to produce enough energy, but novel solid-state lasers are very small.A small size of laser can produce enough energy to cut a few centimeters thick sheet metal.

The second way is to use the laser continuous irradiation target of 10 to 15 seconds, so as to achieve the same damage effect. However, the weak intensity of the laser can be disturbed by atmospheric activities and weather conditions, and its intensity will gradually decay in the long distance transmission.

Xu Ning believes that 300mw Laser Pointer weapons' ideal power weight ratio should reach 2 to 5 kg / kW level.In contrast, chemical laser weapon "YAL-1A " laser can up to 55 kg / kW, the current synthetic fiber laser weapons and the prototype of DPAL level has reached 35 ~ 40 kg / kw.Zhang Yang believes that from the cold war to the present, the United States has invested a lot of resources development of laser technology, in this respect, they have been a leader of laser weapon in the world.The future of laser weapon power density ratio can achieve 5 kg / kW.

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The Bush administration has decided to resume military space laser research, each satellite carrying intercept ballistic missile's laser cannon. In this way, the total number of laser guns in space at the time of the United States to reach at least 4000.The Navy's research shows limits of high energy burning laser beams in coastal waters, and therefore, the effectiveness of laser weapons is limited. The wavelength of the chemical laser is not the best for the coastal environment. Thus, the Navy's high energy laser program changed direction, and in 1995 it stopped working on the feasibility of the chemical laser. The Navy's interest is concentrated in the solid state laser technology, because the application of this technology can make them do not have to deposit high risk chemicals on the ship, but also to avoid the generation of toxic chemicals produced by laser. In order to be able to use laser weapons in the future, the navy has plans to install large power generation equipment on the next generation of aircraft carriers. When the laser weapon developed and improved and produced, it will be deployed and used on these ships.

Chemical lasers have also be used at air force , the air force airborne laser project aimed at placing giant chemical laser on a 747 aircraft to shot down ballistic missiles. The improved Boeing 747 had its first flight in 2001, but there were no 100mw Laser Pointer cannons mounted on the aircraft to test its aerodynamic effects. The laser was installed at Boeing 747 aircraft, and after several tests, the whole system is expected to achieve goal of Scud missile . By then, the prototype can be put into operation, then, this monster will be the largest laser weapon so far. The launch of the company's tests show that the laser can generate heat from a fixed position to destroy the missile. The next hurdle to cross is to allow the laser to fly at a speed of 1000 kilometers an hour to finish the same work on a plane that is 12 thousand meters above the ground. Airborne laser will carry enough chemical raw materials.

However, due to the high cost of chemical laser system, the army believes that solid laser technology can provide them with a smaller size, enough to install the system. In 2002, a 10 kW solid energy laser system already in operation, the transmitter laser beam cut three pieces of thick plate of about 3 mm within 6 seconds. Solid state laser project has also attracted the attention of the air force, the air force is currently being discussed whether the system to replace its aircraft on the active chemical lasers.

The high energy 30000mw Laser weapon is the product of the combination of high power laser weapon and spacecraft. Once the laser weapon found each other it can hit the target immediatelly. Because of its deployment in space, it is a tiger with wings added. Many technical achievements such as laser program are derived from the results of the U.S. military in the cold war period . The US military has been exploring various types of laser weapons.

Laser cannons are the most efficient weapons in PVE. Most of the opinions think that the 200mw Laser Pointer weapon is the best PVE weapons, but the best effective is the difference between. These advantages make laser weapon the best overall performance of the more position . The laser pointer weapon while in use have a lot of difficulty (the most obvious point is on the short distance ), but it can through the corresponding tactics down low adverse effects (such as we are familiar with the distance a kite tactics). To understand more clearly of various burning laser pointer weapons, we need to introduce the following concepts: duration of fire, fire transfer speed, fire interruption interval.

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According to the "Aerospace Daily" reported on July29, the U.S. missile defense agency (MDA) did not give up the interception boost phase ballistic missile by using space based laser weapon, they planto develop a high altitude long endurance UAV.

Since the mid-90s of the 20th century, the US has initiated the airborne burning laser (ABL) program, the kinetic energy interceptor (KEI) plan, network center airborne defense unit NCADE etc. a series designed to boost phase intercept the missile defense plan,ABL program was undoubtedly the most sensual with high-energy laser .

In 1996, the U.S. Department of defense give the ABL project team allocated $1 billion 100 million to develop the experimental set of ABL weapons systems. ABL testing machine YAL-1A improved from Boeing 747-400f aircraft, loaded with the latest development of the airborne laser energy weapon, used to destroy in takeoff boost phase state of tactical ballistic missile, the enemy missile to destroy the enemy airspace and territorial. The ABL aircraft equipped with the system has a megawatt class chemical oxygen iodine laser (coil), infrared tracking / high speed target acquisition system and high precision 5000mw Laser target beam tracing control system.

Although the airborne Attack Laser Pointer program quiet down, but in recent years, the U.S. missile defense agency has been seeking a new generation of airborne lasers which can be carried by the high-altitude uav. The project aims to seek a new way, will be a compact and high efficiency of laser weapons are integrated into the high altitude long endurance UAV will eventually be used to intercept in boost phase ballistic missile. Due to the high altitude long endurance without UAV flight height is very high, so it can avoid the adverse effects of atmospheric environment and the clouds of laser weapons used to the maximum extent.

In 2004, ABL destroyed a ballistic missile successfully. However, after Obama took office, he paid more attention to the development of 300mw Laser Pointer technology. December 2011, the U.S. Department of defense decided to terminate the ABL airborne laser research and development projects. Although the ABL program has been terminated, but through the implementation of the project, the United States in the field of laser technology, energy preparation and beam control were obtained great progress, this is the new airborne laser development has laid a solid foundation.

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