User blogs
The pointers preferred by using stargazers expend a neodymium diode blue laser pointer and emit a green beam at a wavelength of 532 nanometers. Such as lasers appear a great deal brighter than the more average diode lasers that produce a purple beam at wavelengths longer than 630 nm. The rationale is fundamental: the human eye is a good deal even fine-eco-friendly light than it is to crimson easy.
except on nights of first-rate clarity and close-zero humidity, if you shine a green laser pointer into the sky, that you can follow the beam hundreds of meters up. To you and any person standing round you, it appears like the beam This makes it in fact easy to demonstrate someone a specific celestial object. just factor the laser at it and say, "seem there!"
However some models have a. "Constant-on" environment. These have become standard as pointing aids for telescopes. Once the laser pointer 5000mw is installed and coaligned with the scope, you just movement the scope round till it's pointing at your goal celebrity, and when you appear in the eyepiece, there it's.
The green 3000mw laser pointer in usual exercise among astronomers and the usual public have an influence output of a little less than 5 milliwatts; within the US, these are known as class 3a strongest laser. Reduce-wattage lasers, reminiscent of those in CD players and laser printers, are class 1 or 2, while greater-wattage gadgets, reminiscent of these in medical or industrial devices, are category 3b or four. The better the type, the extra severe the warning label required by using the US food and Drug Administration FDA.
in comparison with shining easy bulbs, which draw tens to lots of of watts no longer milliwatts, 5 mW appears like very little. however, laser of is particularly centred into a very slender beam. additionally, this beam is highly collimated, which means it diverges spreads out very slowly. 2000mw laser pointer usually emit a beam about a millimeter in diameter. Even as far as a kilometer away, the beam is not any greater than a meter throughout.
Hobby projects in need of pockets and reductions to be made within fine pieces may benefit from the lowering laserlight. You can also make some sort of homemade cutting laser light originating from a high power laser pointer and a Blu laser light diode purchased from any laser device provide shop. You'll be able to reduce by means of small vinyl as well as timber components inside your pastime jobs. You will need a handful of appliance instruments in addition to knowledge of employing a soldering metal, nevertheless no special electrical competencies. If you are underage, person oversight is essential to create the handmade lazer second hand cutter and ultizing this.
Place some sort of published connected with paper on a family table. Take away the battery pack limit from the tailgate end of the 1000mW 532nm blue laser pointer Pen . Take off the energy from the electric battery section. Position the power cover as well as batteries absent.
Retain the green laser beam suggestion from the back-end in a palm. Secure the needle-nosed pliers in the other hand.
Clamp the particular teeth of the needle-nosed pliers round the front end of the green lazer hint. Pose this needle-nosed pliers to find the top end of the inexperienced laser light pointer through the back end.
Position the nose with the green laserlight pointer away. You can put needle-nosed pliers to one side.
Place the tailgate end in the environment friendly laser hint to the papers.
Move the spine ending of the environment friendly 2000mw laser pointer. Halt turning in the event the attach plus circuit board for the laser device system, jutting out of your tailgate end, will be experiencing right up.
Hold the back-end of the eco-friendly laserlight suggestion for the papers by using a person palm. Contain the tweezers in your opposite.
You can put jaws from the forceps throughout the bottom of the green laser device diode. Tug the hole laser beam diode out from the base of the laser device construction. Place the eco-friendly laser device diode out of your work enviroment.
Insert each pin attached to the bottom part in the Blu laser diode into the flag holes simply vacated because of the green laser device diode, utilizing a two of tweezers.
Warm up a soldering flat iron for Ten mins. You can put idea of the soldering straightener from the outlet table that may be over the twist for the laserlight construction.
Take out the rule from the soldering iron just after Just a few seconds include handed down. This signal mother board limiting how much energy that can reach the Blu lazer diode for the laser device putting your unit together is inert. Unplug this soldering flat iron.
Position the rule from the flat-edged jeweler’azines screw driver to the twist within the laser light assemblage. Swivel the screw 1 / 2 switch clockwise to improve the power choice of the particular Blu laser device diode.
Apply fast behaving developing adhesive within the wheel of your tailgate end with the laser device pointer. Replace the nose of your Rechargeable Laser Pointer into the tailgate end. Permit connecting glue searching for an hour.
Place the actual battery power back into the electric battery section with the Blu laser diode. Screw the car battery limit on the back end.
Show your hand made reducing laserlight by seeking the leading stop in the classifieds coming from a couple of inches away.
Depress the particular “On” control key to stimulate this beam of light. Put out this “On” control key if the magazine begins to smolder. Hang a drenched clean cloth over the newspaper for you to put out a smoldering.
The green laser pointers with laser class 4B may only be passed on to someone who can demonstrably use this device responsibly. For example, a friend of mine got a laser officer certificate before he even touched a green laser pointer. Just because it's dangerous.
I've bought several Class 4B lasers myself, some since I was a teenager. However, I was always told, for example, that I should never point the pointer at a person, especially not in the eyes. So far I've always stuck with it and only ever used it for presentations.
If you really want to give a child a laser pointer, then you should really explain to them how to use it responsibly and show them the dangers. A blue laser pointer does not necessarily belong in the hands of children because they are not necessarily aware of the consequences.
With young people, I can't say exactly how to react. You have no choice but to teach responsible behavior. And I don't think so much that you can put every young person who owns a 1000mw red laser pointer into an apprenticeship.
I don't think they should be banned right away. The fact is, many students actually use the laser pointers for their lectures and don't bother with them. However, it is always stupid when others abuse these laser pointers and then dazzle cars and other vehicle drivers. You will likely cause an accident from glare and that is not very practical.
I think that the purchase of laser class 4B for the lectures should then perhaps only be spent by the lecturers and must be picked up again after the lecture. This ensures that the 3000mw laser pointer are not misused and that students can still use them for their lectures and presentations.
Therefore, I also think that these 1000mw laser pointer, which you mean, are banned here in Germany and, in my opinion, you should keep your hands off toys from China anyway, as they usually do not have a CE mark or even an approval and I buy my children Never use toys from China. Then I'd rather invest a little more money and buy something that has also been tested.
Laser pointer can help you signal for help from others. Whether you go camping a lot or are an avid hiker, a laser pointer can help you prepare for the unexpected. These days, many people like to travel alone and laser pointers can be a great tool to help others a few miles away. One can choose the best burning laser pointer and use it to pop balloons, light matches, and create flames with gasoline or lighter fluid.
Green laser pointer can be used for light painting, an innovative form of photography that combines natural and handheld light sources to create stunningly beautiful landscapes.
Laser engraver are widely used in astronomy, primarily for pointing at stars. With their unique ability to emit straight and highly visible beams, laser pointers are able to pinpoint starting points and constellations. Lasers are an effective means of keeping birds away from unwanted areas. It helps to make birds fly away without harming them, because they won't come back if they are frightened.
Most consumer uses - other than killing aquarium growths - do not require more than 5 milliwatts (the traditional maximum for lasers sold as pointers in the United States). So why do some people buy handheld lasers of 25, 100, 250 or even 1000 milliwatts?
One reason is that there are some laser enthusiasts who like to experiment with lasers. They can create homemade laser light shows, they can do experiments involving burning or engraving materials, or they may like to pop balloons or popcorn wicks with light. An article in the New York Times quotes one 18-year-old hobbyist as saying, "You learn a lot in a hobby like this: electronics, soldering, physics. You also learn about light, you learn about optics. You learn a lot about mechanics, too."
Researchers are interested in diamond-structured lasers pointer because they are able to transmit energy over long distances and are less susceptible to interference. The study may be able to achieve applications in blue laser pointer ranging, space communications or red laser pointer weapons.
The key to this research is that this diamond laser pen can improve manufacturing technology. The diamonds used in this green laser pointer are not made from the ground but are made in the lab. Now scientists have been able to create more perfect synthetic diamonds, and they will become better and better with time.
Acupuncture has the function of regulating qi and blood, relieving pain and strengthening the immune system, but this effect is often slow, unable to deal with severe cervical and lumbar diseases to patients with various problems. Russia is the pioneer of the use of medical green lasers pointer, the famous Russian neurosurgery experts, the technology's main patent inventor Professor Saandre Boris Elieci in many years of clinical work, witnessed the patients undergoing open surgery Pain and its treatment of the spine physiological function of the destructive, so determined to study a truly minimally invasive treatment.
In 1981, the World Health Organization has put laser pen medicine as one of the official disciplines, in fact, as early as the invention of laser in 1960, the second year, people began to study the medical purple laser pointer, through years of research, people will laser pointer on the human body and The role of biological is divided into five kinds: thermal effect, photochemical effect, pressure effect, electromagnetic field effect, biological stimulating effect, they are the scientific basis and basis of laser diagnosis and treatment of disease.
Silk if the machine has 80 laser irradiation point, the helmet is also rich in silicone feet, can pull the hair, so that the laser directly to the hair follicle, to achieve the best hair effect. Its coverage is large, the laser pointer emission wavelength is accurate, and the use of pure gold thermal patch, to protect the maximum transmission of laser energy to ensure the best hair effect.
Blue laser pointer processing services include laser cutting, drilling, etching and other processing technology; mainly used in LED wafer dicing, ceramic circuit board processing, high hardness materials processing and other fields; to achieve the downstream products of precision manufacturing.
With the average annual increase in light vehicle production to 4% by 2020, the airbag market is expected to achieve a compound annual growth rate (CAGR) of 8.1% during this period. In part because of the overall shift in growth stemming from the introduction of new safety regulations in India, China and other developing countries. By 2020, emerging economies are expected to account for 58% of global vehicle production. China alone will account for more than 30% of its commercial vehicles and passenger cars production will exceed Western Europe and North America.
Recently, large-scale airbag recalls have sparked public attention to the need to incorporate stringent quality standards into the manufacture of airbags. The impact on safety of these lifesaving equipment and equipment is a sign that consumer confidence has been eroded by relentless cost pressures on 500mw laser pointersuppliers. To win back the trust of the public, OEMs are taking extraordinary steps to ensure the safety of their passengers. These new measures, aimed at improving airbag quality control, pose additional challenges to Tier 1 suppliers, who continue to focus on reducing the unit cost of airbags in the ever-changing airbag supply ecosystem.
For mature markets, increasing passive safety will enable new airbags to achieve a wider range of applications, such as in a single advanced vehicle can have up to 12 kinds of applications. For most new vehicles, the driver side, passenger side and side curtain airbags are standard, while many passenger and light trucks are equipped with eight or more airbags. In addition, the dimensions of products are constantly evolving and evolving with the introduction of larger, wider side impact airbags, as recommended by automotive safety testing organizations such as the New Car Evaluation Procedure (NCAP).
When combined with process optimization and resource optimization, the most advanced 10000mw laser pointer cutting technology can help airbag manufacturers overcome multiple business challenges. Advanced balloon design and cutting technology to meet these stringent new requirements, even in the use of low-cost materials such as polyester, but also to ensure that the final quality close to zero defect. By increasing productivity and efficiency, suppliers can achieve gains, remain competitive, and meet the increasingly demanding requirements of OEMs. Identifying anomalies during the production process can result in significant losses, such as downtime or expensive re-cutting, especially when the safety of vehicle occupants is at risk. Today, the new airbag pre-production software is designed to standardize the entire production process by validating every step of the airbag fabric preparation process.
Since the geometry of the cutting part comes from the industrial design department, in various forms, the first step is to check the unit and the consistency of the scale. The second step is to remove all the geometries that are not needed for the cut, even if the naked eye is not visible. The powerful wizard program detects and marks them to eliminate the risk of cutting 1 / 10mm holes in the center of the airbag. For multi-layer cutting, the third step involves optimizing fabric usage while ensuring laser pointer cutting quality. For a molded airbag, the next step is to build the mesh, so as to prepare for the subsequent optimization of cutting, and according to the layout of industrial loom assembly parts. Before the first cut, the necessary data is extracted in a few minutes.
The innovative use of new airbags continues to deepen both inside and outside the vehicle. Volvo and Land Rover are currently offering pedestrian airbags for selected models on the European market. In the range of 20 to 50 km per hour, these airbags are designed to minimize certain frontal impacts. Other concepts still under development include a rear airbag mounted on the front seat and roof.
Because of the aftermath of the airbag inflator scandal, the automaker has taken stringent measures to strengthen the inspection of the components of the airbag ignition system. The automated inspection system enables suppliers to ensure that their components meet stringent safety standards without slowing production schedule. For the fabric part of the airbag, the type of inflator used generally determines the choice of material. In a similar fashion, automated visual inspection has become an important part of the quality 3w green laser monitoring process. Today, automakers require many airbag suppliers to install scanners and vision systems for size control of airbag cuttings.
However, the strengthening measures only exacerbate the complexity of the manufacturing process. Despite these new development initiatives, airbag suppliers still maintain the same cost targets to make a profit. Airbag manufacturers are reaching the limit of cost optimization, so there is an urgent need to find a solution to the plight of a sharp decline in costs. This explains why many manufacturers are using less expensive materials, such as polyester fibers. However, lower costs are bound to exhibit disadvantages because the inherent resilience of these materials tends to be more severe.
Theoretically, cutting a molded airbag requires designing a starting point, and using a specific template to outline a consistent cutting path. If the material itself is completely rule-based, it will be the only operation to be performed. However, since low-cost polyesters are more elastic than other fibers, weaving and post-processing of the material may cause bending or skewing of all or part of the workpiece.
These complex problems can now be easily solved with a new generation of green astronomy laser cutting preparation software. By defining specific areas of the unmodifiable primary molding balloon design, the cutter instantaneously adapts the geometry of each cut to the actual profile of the fabric while meeting the positioning and spacing rules. The SmartCutting software demonstrates this flexible, dynamic interaction between the balloon cutting preparation software and the tool. The cut piece is sized exactly the same as the verification template and has a constant system capacity, even when cutting highly deformed materials.
The use of a high power green laser pointer beam to cut a thick stack of cutting and suturing materials at high speed conditions and without melting the material layer requires highly precise dynamic laser power control. In fact, cutting is done by sublimation, but this can only be achieved if the laser beam power level is adjusted in real time. When the strength is insufficient, the machined parts can not be cut correctly. And when the strength is too strong, the layers of material will be squeezed together, resulting in the accumulation of fiber particles between the layers. A new generation of laser cutting machine can effectively control the laser power intensity in the nearest wattage and microsecond range.
In addition, several factors may be taken into account, such as the nature of the material to be cut, the geometry of the shape, the cutting speed and acceleration, and the like. It is also necessary to consider the workpieces cut a little earlier in order to adjust the temperature at which the risk of melting of the material in the vicinity of the zone is increased slightly and which may cause the adjacent zone to melt. This is precisely the risk of tangent, which cuts the flow through a single cutting path to ensure flawless quality.
The production process is a step that leads to profit or loss. By using the right pre-production software and the latest blue laser pointer cutting technology, airbag manufacturers can reduce their unit production costs while producing flawless products that contribute to the road safety value chain.
With the "Made in China 2025" planning and implementation, for the automation, intelligent put forward higher requirements, bear the brunt of the manufacturing sector. How to adapt to the transformation and upgrading requirements, how to enhance their competitiveness, is the primary problem faced by domestic enterprises. To this end, OFweek blue laser pointer network editor interviewed AMADA (China) Company Sheet Metal Business Sales Promotion Division Sales Planning Division, Mr. Gu Diou, to explore the transformation and upgrading of the road.
It is understood that AMADA this year is the 70th anniversary of the establishment, during which AMADA has grown into the world's leading supplier of sheet metal processing. In this regard, Gu Diou said: "AMADA from a small company to grow into an international business, mainly due to we have been focused on the sheet metal processing, and continue to develop new technologies and equipment, to provide users with more efficient solution Although we have achieved impressive results in the area of sheet metal processing, such as the invention of nitrogen-cut stainless steel and laser processing machines, we are constantly experimenting with new technologies and new equipment by continually updating evolution to remain dynamic and Competitiveness! "
This MWCS2016, AMADA to bring users the latest digital sheet metal factory "VPSS 3i" concept of processing, focusing on the overall quality from the product, taking into account the most reasonable process, the most optimized paperless processing revolution, focused display A precision machining and production processing solutions. In the precision machining, the main display of the new fiber burning laser pointer processing machine ENSIS3015AJ, a few full-automatic solution EM3510ZRB and high-precision hybrid drive bending machine HG8025. The ENSIS3015AJ is equipped with AMADA's independently developed fiber laser oscillator, combined with the unique latest beam control technology, to achieve a 2KW cutting 25mm thick plate, the energy-saving effect will be maximized at the same time, variable variants for the efficient production possible. EM3510ZRB equipped with the world's unique driving mode: dual-AC servo direct-drive motor, and since the advent of the use of CNC punch press ZR turret, the most innovative. Not only can achieve high-speed, high-efficiency processing, but also to achieve the finished product without scratching the high-quality processing. Combined with ID molds and unrestricted machining construction, it is easy to cope with variants of variable production and 72 hours of continuous machining. The HG8025 maximizes the operating performance of the bending machine with its high-rigidity body + new hybrid drive system and angular solution (no bending test required and stable bending accuracy), achieving high-speed, high-precision, Of the bending process.
In mass production processing, AMADA mainly demonstrated LCG3015AJ automatic and efficient fiber 3000mw laser pointer processing machine, AE-NT + MP2512L automatic loading and unloading number of red package and 3D automatic high-precision bending machine HM. Which LCG3015AJ whether beam quality, processing efficiency, or cost-effective are in the world's best standards. AC servo drive CNC punch press AE2510NT and automatic loading and unloading device MP2512L combination, can be a long continuous uninterrupted operation, the punching capacity to maximize, and at the same time can reduce labor costs. In addition, AMADA also demonstrated the world's most high-speed pulse band saws PCSAW720, automatic tapping machine CTS900NT, mold grinding machine TOGU3.
In recent years, the industrial concept of 4.0 in the global context of rapid warming, China has also made "2025" plan in China, focusing on the direction of the intelligent transformation and upgrading, manufacturing bear the brunt. In this regard, Gu Diou said: \ This is also the AMADA digital sheet metal factory 'VPSS 3i' processing concept of innovation, the balance has been the various channels Process, through the reverse process and the introduction of the timeline to enhance the quality of sheet metal processing and intelligence level.We also continue to enhance the level of automation of sheet metal processing equipment to make it towards high-speed, high precision, low cost and energy saving and environmental protection Direction. "
"At the same time, intelligence has brought new opportunities and new challenges." Gu Diu added: "China's sheet metal processing industry has been mass production of the times, in the industrial 4.0, IoT, and China 2025 under the wave of China's sheet metal processing industry will move in the direction of polarization for the strict quality control, strict delivery orders will be more and more enterprises.In contrast, the blind pursuit of low prices, quality control is not strictly business orders Will be less and less.In the case of weak 1000mw laser pointer market, personalized customization needs become mainstream, multi-variety of small-volume production of sheet metal processing flexibility for the new requirements.AMADA digital sheet metal factory concept, through continuous optimization and balance of the To enhance the efficiency and competitiveness of the sheet metal processing industry, to meet the industrial 4.0, IoT and 2025 in China to create new requirements!
Over the past decade, the so-called single-layer materials by scientists attach great importance to these materials in the field of physics has a very large potential. At the beginning of 2016, the research team of the University of Würzburg was supported by the European Research Council (ERC) 15 million euros for the study of transition metal sulfides (TMDC). Some progress has been made.
In physics, a & quot; monolayer & quot; refers to a minimum thickness of a solid material, typically a single atomic layer thickness, and the crystalline material may be three or more blue laser pointer of atoms, also referred to as two-dimensional materials. Two-dimensional materials often exhibit unexpected properties. Such as TMDC, have similar characteristics of the semiconductor can be used to manufacture ultra-small, energy-efficient chip. TMDC has a fairly simple two-dimensional structure. Molybdenum or tungsten and other transition metal atoms in a single row structure, caught in the same thin layer of sulfur between the elements. TMDC made with different base components has a wide range of electronic and optical properties.
The team at the University of Würzburg, Germany, found that TMDC can emit light when it absorbs energy. Experiments show that this new single-layer material can be used in the manufacture of new energy efficient laser source can also be used for quantum effects research.
Quantum Communications Research: First, a single layer of material is prepared by a simple method. In the first step, the multilayer film is peeled off from the TMDC crystal with tape. A thinner film is peeled off from the multilayer film, and is repeated to obtain a single-layer material. The monolayer material is then cooled to a temperature slightly above absolute zero and excited with a 3000mw laser pointer, under which the single layer of material will emit a single photon. The researchers explained that, in fact, the excitation of two photons, light particles are produced in pairs. This photon is very interesting to the source: the photon pairs of two photon states overlap each other, entangled together. The state of one photon directly affects the other photon, and is not limited by distance, a principle that can be used to encrypt communications.
For new laser sources: Scientists at the University of Würzburg have demonstrated another application of this monolayer material. A single layer of material is placed between the two mirrors and then excited with a laser. When the laser radiation reaches a certain degree, TMDC starts to emit photons. These photons hit the mirror and send color back to the TMDC plate, which stimulates TMDC atoms to produce new photons. "We call this process a strong coupling, and the action of light and matter produces exciton-polarized photons." This is the first time that polarized photons have been detected at room temperature in monatomic layers. This "clone" photon has similar properties to 400mw laser pointer, but produces a fundamentally different principle. Ideally, after the initial excitation, new light particles can be generated by self-sufficiency, without any additional energy supply. In contrast, the laser material in the laser requires external sustained excitation.
http://laserman123.canalblog.com/archives/2016/11/08/34539740.html
http://faceluck.org/blogs/post/5908#sthash.5sempsXl.BdXjlo8t.dpbs
http://laserman123.jigsy.com/entries/general/analysis-of-the-principle-of-laser-fire-alarm-system
In the 1970s, a man named Gordon Moore predicted his performance in the semiconductor industry by doubling the chip's performance every 18 months. This prediction over the past 40 years all the way to prove his right, and the transistor density of the chip also followed by doubling, doubling, and then double. For people who are familiar with the chip, high-performance is usually associated with this high fever, with our dependence on electronic products increasing, mobile phones, laser 5000mw,flat panel, notebook computers and other heating problems, not only negative impact on the experience, The manufacturers to design a more beautiful, lightweight new products.
To solve the electronic products, especially micro-electronic devices of the heat, we must first understand the root causes of these heat generated. And the answer may be hidden in the latest paper published by Dr. Liao Linlin. The former Sichuan Province college entrance exam tutor from Professor Chen Gang, this year from the Massachusetts Institute of Technology received a doctorate. His research team accurately measured the interaction between electrons and phonons, the results not only explain the micro-electronic equipment, the causes of fever, but also can be used to further improve the performance of thermoelectric materials.
With the development of semiconductor chips, more and more transistors are stuffed into smaller and smaller spaces. Massachusetts Institute of Technology engineers recently found that mobile phones, laptops and other electronic devices will be hot, the main reason is that electronic and thermal energy to carry the phonon interaction. This interaction was once overlooked by scientists, but the latest research results show that in microelectronic devices, this interaction has a significant impact on heat dissipation, the related research results published in the October 12 of the "Nature Communication ".
In the 1970s, a man named Gordon Moore predicted his performance in the semiconductor industry by doubling the chip's performance every 18 months. This prediction over the past 40 years all the way to prove his right, and the transistor density of the chip also followed by doubling, doubling, and then double. For people who are familiar with the 3000mw laser pointer chip, high-performance is usually associated with this high fever, with our dependence on electronic products increasing, mobile phones, flat panel, notebook computers and other heating problems, not only negative impact on the experience, The manufacturers to design a more beautiful, lightweight new products.
Thermoelectric materials have a very wide range of applications, including thermal detectors and NASA's latest proposed for space exploration equipment, nuclear batteries. The phenomenon of electron scattering by phonons is not new, but has long been neglected by scientists. With the continuous development of semiconductor technology, the concentration of electrons becomes higher and higher, this phenomenon can not be ignored. Scientists must think about how to manipulate the electron-phonon interaction in order to increase the efficiency of the thermoelectric device on the one hand and prevent the microelectronic device from heating up on the other.
Phonon and electronic bumper car games
Whether in 20000mw laser transistors (semiconductor materials, such as silicon) or wire (conductor material, such as copper), the electronic current movement is the main medium. The reason why resistors exist is that the electrons flow through a roadblock - a phonon carrying thermal energy collides with electrons, pushing it out of the current path. For a long time, scientists have been investigating the effects of electron-phonon interactions, but the focus has been on electrons rather than on how the interactions affect phonons. "Scientists rarely study the effects of this interaction on phonons, because they think this effect is not important," Liao Lin said, "but Newton's third law tells us that each force has a reaction force, but we do not know what The reaction will become important. "
Scattering, heat is difficult to coexist
According to Liao and colleagues, when the electron concentration exceeds 1019 electrons per cubic centimeter, the interaction of electrons and phonons in silicon, the most commonly used material in semiconducting materials, can produce a large scattering of phonons. When the electron concentration reaches 1021 per cubic centimeter, the heat dissipation capacity of the material will be reduced by phonon scattering by 50%. "This is a very significant effect, but many people are doubtful," Liao Lin Lin said. This is mainly because in previous experiments with high concentrations of electronic materials, scientists have assumed that the cooling capacity of the decline is not due to electron - phonon interaction, but due to material defects caused. These defects are due to the doping of materials, silicon, for example, phosphorus and boron are commonly used doping atoms, the purpose is to increase the material's electron concentration. Therefore, to verify Liao Linlin's theory, it is necessary to separate the electron-phonon interaction and the influence of defects on heat dissipation capacity. The specific method of implementation is to increase the electron concentration in the material, but not to introduce any defects.
The team developed a technique called three-pulse photoacoustic spectroscopy to optically increase the concentration of electrons in silicon crystal thin films and measure phonon production in the material Of any impact. The technique is an extension of the traditional "two-pulse photoacoustic spectroscopy" in which the scientists accurately control the timing of the two blue laser pointer beams. The first beam produces phonon pulses in the material and the second beam measures the scattering or attenuation of the phonon pulses. Liao Linlin introduced a third laser beam, which can accurately increase the electron concentration in the silicon material without introducing any defects. After the third laser beam is emitted, the measurement results show that the phonon pulse decay time is significantly shortened, which indicates that the electron concentration increases the phonon scattering and inhibits its activity.
The experimental results show that the introduction of the third burning laser pointer can shorten the decay time of the phonon pulse. The larger the laser intensity (the higher the electron concentration), the shorter the decay time of the phonon pulse. The result was a great excitement for Liao Lin's team, which was a good match for their previous calculations. "We can now determine the effect is very obvious, and we confirmed it in the experiment," Liao Lin Lin said, "This is the first can directly detect the electron - phonon interaction on the impact of phonons experiment." Interestingly, The concentration of 1019 electrons per cubic centimeter, than some of the existing transistor is even lower, in other words, the latest discovery of this phenomenon is part of the existing microelectronics fever one of the culprits. "According to our research, this effect will become increasingly important as the size of the circuit gets smaller," says Liao. "We must seriously consider this effect and study how to use or avoid its effects."
With the development of laser technology, laser range finder, laser target indicator and laser beam weapons (which used a ultra Powerful Green Laser )appear rapidly, and all above of them has played an important role in several local wars. An international tribunal in The Hague ruled in favor of the Philippines in a maritime dispute Tuesday, concluding China has no legal basis to claim historic rights to the bulk of the South China Sea.China, Vietnam, the Philippines, Taiwan, Malaysia and Brunei all have competing claims over territory in the South China Sea.
Nowadays, there are great changes in the form of war and urban warfare.Variety of weapon comes out, which is particularly important for the protection of personnel .Under this circumstance, the burning laser weapon boarded the stage of history, many countries are committed to the research of vehicle mounted remote control weapon.
The shipboard laser warning technology can be divided into two types: active warning and passive warning. Active laser warning receiver is their own equipment emission laser signal light(which emits a wavelength of 405nm , just like the blue laser pointer we used ordinary) and scanning the target that, through received from the target reflection of laser echo, target detection and investigation; passive laser alarm system itself does not emit any laser alone received from each other to be launched to laser signal detection and warning.
Shipborne burning laser warning system to detect close wavelength coverage of the wavelength of the laser terminal guidance missile(which wavelength is 650nm,the same as the Red Laser Pointer we used ordinary) and aerial bombs and laser ranging device, and has multi target real time detecting and receiving ability, on the pulse repetition frequency ranging, laser beam threats and laser semi-active guidance threat source identification. Shipborne laser warning system mainly consists of a plurality of multi wavelength integrated probe and an information processing device and comprehensive probe has a plurality of optical windows, the along the vessels surrounding tens of meters arrangement, ensure 360 degrees in any direction can detect; comprehensive probe has larger detecting high angle and negative angle, to ensure the incoming air and surface laser irradiation of real time detecting and warning, and to ensure that the ship in the swing state can still meet the elevation angle of the interception function.
