2017116(月)

Laser Communication Technology


Laser communication more intuitive understanding is the use of laser transmission of information communication. Its technical principle and the principle of radio communication is similar, that is, the first sound signal modulated onto the red laser外部リンク beam, and then send the laser with the sound signal.

The laser itself has the characteristics of high brightness, strong directivity, good monochromaticity and strong coherence. In addition to the language information language, the laser can transmit characters, data, images and other information.

The advantages of laser communications: large communications capacity, in theory, laser communications can simultaneously send 10 million television programs and 100 million road phone. Confidentiality, the laser is not only extremely strong direction, and can be used invisible light, which is not easily intercepted by the enemy, the confidentiality is good. The structure is light and the equipment is economical. Since the divergence angle of the green laser pointer外部リンク beam is small and the directivity is good, both the transmitting antenna and the receiving antenna required for laser communication can be very small. Generally, the diameter of an antenna is several tens of centimeters and the weight is only a few kilos, microwave antenna, the weight of a few tons, more than ten tons of dollars.

Communications distances are limited to line-of-sight (kilometers to tens of kilometers) and are subject to the effects of the weather and even disrupt communications in harsh climates. Atmospheric oxygen, nitrogen, carbon dioxide, water vapor and other atmospheric molecules on the optical signal absorption; atmospheric molecular density and suspended in the atmosphere of dust, smoke, ice, salt particles, microorganisms and tiny water droplets and other optical signals Scattering effect. Clouds, rain, fog, snow and other laser so severely attenuated. Atmospheric turbulence caused by air convection on the Earth's surface can have effects such as beam deflection, beam spread, beam flare (random variation of bright and dark spots within beam cross-section), and image jitter (random jump of beam convergence point).

Different laser wavelengths have different reduction in the atmosphere in the house. Theory and practice show that the laser attenuation of the wavelength is 0.4 ~ 0.7 m, and the wavelength is 0.9, 1.06, 2.3, 3.8, 10.6 m, respectively. The laser with 0.6 m wavelength has stronger fog penetration ability. Atmospheric most powerful laser外部リンク communication can be used for communication of rivers, lakes, border areas, islands, mountains, canyons and other places. It can also be used in microwave communication or coaxial cable communication, temporary repair equipment when interrupted repair. Blue green laser with wavelength of 0.5 m can be used for underwater communication or submarine communication.

Aiming difficult. The laser beam has a very high directivity, which brings with it many difficulties in aiming at the transmitting and receiving points. In order to ensure the aiming between transmitting and receiving points, not only the high stability and precision of the equipment are put forward, but also the operation is complicated.

The main application of laser communications: short-range communication between the ground; short distance transmission of fax and television; due to the large burning laser pointer外部リンク communication capacity, for missile range data transmission and multi-channel communication between the ground. Global and satellite communications through satellite total reflection, and underwater submarine communications.



2017104(水)

New Applications of Laser Cutting

Compared with the traditional process of spot welding technology, laser welding can be customized weld form, optimize the weld after welding strength, increased design and process flexibility, can be applied to any welding form, any welding direction. At the same time can be customized according to process requirements weld distribution, making the welding force of the optimization can be a perfect realization. Laser welding soldering without contact, flexible weld requirements, can make the welding overlap surface smaller. The use of green astronomy laser外部リンク welding can reduce the cost of materials to a certain extent and reduce the weight of the body, to ensure the quality of the body on the basis of the maximum to achieve light weight, but also to achieve the purpose of energy conservation.

The challenges of laser welding copper are related to two major physical properties of materials: low absorption rates for most high-power industrial lasers, and high thermal conductivity during processing. We know that the copper absorption rate increases with the decrease of the wavelength, which means that the laser visible band (for example, 532nm wavelength green laser welding for copper) will have a significant advantage, but for the majority of the welding power range required for the application of these burning laser外部リンク are not available or been industrial verification.

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 laser 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.

Another application that utilizes UV lasers for small beam size and low stress properties is drilling, including through holes, micropores and blind burrs. The UV green laser light外部リンク system drills through the substrate by focusing the vertical beam straight through the substrate. Depending on the material used, holes as small as 10 μm can be drilled. Ultraviolet lasers are particularly useful for multi-layer drilling. Multilayer PCBs are made of hot press using composite materials. These so-called "semi-cured" will be separated, especially after the use of higher temperature laser processing.

In 2016 the domestic laser processing equipment sales reached 25 billion yuan, according to research projections, in 2020 the laser processing market space will reach 50 billion yuan. In the domestic market, in 2015 the laser marking, cutting, welding of the three main applications accounted for 68% of sales, compared to 2005, the proportion of laser marking equipment sales there has been a significant decline from 65% to 24%, the application of new applications of red laser外部リンク cutting and welding equipment sales increased significantly from 28% to 44%, because the transformation and upgrading of manufacturing to increase the demand for emerging laser processing equipment.



2017619(月)

Application of Laser Technology


Laser TV is not only have their own table, in the content and the current smart TV no difference. Because the use of laser TV is the TV system, and even many TV brands are also launched laser TV. Their LCD TV and laser TV use the system is similar to the same resources to provide. So use the 2000mw laser pointer外部リンク TV without worrying about no content. With the gradual enrichment of network resources, laser TV online can see a lot of high-definition content, the latest TV series, movies and entertainment programs can use the laser TV to watch. Past the projector needs a separate device, connect the player or a variety of boxes can see a large, this way OUT out. Laser TV is to see to see, do not worry about no see.

First, not the same place is the light source, laser light source life is very long, easily tens of thousands of hours to laser TV life comparable to LCD TV. Can be said that a laser TV use a three or five years is not a problem, no longer worry about the problem of light, this life cycle has been enough, after all, not all families have to use a TV for 10 years 20 years. Second, the laser TV is a reflection of the ultra-short focus of the technology of the projector, this ultra-short focal length 3000mw laser pointer外部リンク TV can be achieved within 0.5 meters distance of 100 inches of the screen. In other words, laser TV can be placed in the TV cabinet on the projection of 100 inches, in the past the projector hoisting in the middle of the living room situation gone.

But laser weapons have advantages and disadvantages. For example, in the rain or dust weather, its combat effectiveness will be greatly reduced. The development of laser weapons in the United States, mainly facing the choice of high-energy laser weapons twists and turns, a variety of key technologies have yet to be overcome, research and development costs overdraft progress delay, laser weapons to be miniaturization and other issues, the existence of these problems is also greatly limited The development of burning laser pointer外部リンク weapons has become a major obstacle to the installation of laser weapons.

Laser TV is able to achieve 100-inch screen, but the screen brightness enough? Brightness is not enough, the screen size is large, but the display is difficult to guarantee. So the brightness is not high, is a laser TV challenge a foundation of LCD. Now the laser TV brightness is basically 3000 lumens. But the rapid development of high power laser pointer外部リンク light technology is expected in the second half of the release of new products, many began to configure a 4000 or even 5000 lumens of brightness. This brightness and then with the anti-light curtain, even if the lights to watch, the effect is also very to force. Laser TV brightness breakthrough so that this product no longer appear during the day can not be used at night must be dark paint to show the situation. So the brightness of the breakthrough is always a main line of laser TV, it is gratifying that the current laser light source brightness breakthrough faster. It is clear that the development of laser TV is not subject to brightness and stagnation.

In fact, laser weapons are a directional energy weapon. According to different combat purposes, can be divided into tactical laser weapons and strategic laser weapons two categories. Which tactical laser weapons is the use of 5000mw laser pointer外部リンク as energy, as conventional weapons, as the enemy directly to the enemy, tank aircraft, such as killing damage, combat distance of 20km or so. The strategic laser weapons is more like a "big kill device", can attack thousands of miles away from the intercontinental missiles, but also attack the reconnaissance satellites in space and communications satellites. It can be said that high-base high-energy laser weapons is an ideal weapon to seize the advantages of space, so the world's major military powers are spending money to research and development.



2017524(水)

New Detection Technology


Compared with microwave radars, which have the same application in the car, the laser radar working in the optical band has a higher distance resolution, angular resolution and speed resolution than the microwave level of 2-3 orders of magnitude. Therefore, the lidar in the measurement process can bring distance, angle, reflection intensity, speed and other richer information, with these data can generate multi-dimensional target images, to help us or the system has a more detailed awareness of the target.

In addition, due to the short laser wavelength, can launch a very small divergence angle (μ rad order) of the blue laser pointer外部リンク beam, multi-path effect is small, that is not formed directional emissions, and microwave or millimeter wave generated multipath effects, anti- To achieve low altitude, low altitude target detection. The laser active detection has a characteristic that does not depend on the external lighting conditions or the radiation of the target itself. It is only necessary to obtain the target information by detecting the echo signal of the laser beam emitted by itself, so that all-weather work can be realized. However, the laser radar is susceptible to atmospheric conditions and the dust of the working environment, to achieve the all-weather working environment in the present terms or the most difficult thing.

In fact, the premise of laser radar technology is 3000mw laser pointer外部リンク ranging technology. We can usually see the distance measurement method, from the categories can be divided into: laser time-of-flight method and triangular method. In simple terms, they are suitable for long distance ranging and short distance ranging. The TOF method can be divided into: pulse modulation (pulse ranging technology), the use of the target to the optical signal diffuse to measure distance; phase modulation, the intensity of the laser continuous wave modulation, by the phase difference to measure the distance information The The choice of LIDAR for different methods depends largely on its type and practical application.

Lidder is also divided into many categories. Starting from the modulation, there are mainly direct detection of lidar and coherent detection of lidar. Commonly used, including autopilot, robot, mapping used, is basically a direct probe lidar. More special, such as wind, speed and the like radar, the general use of coherent modulation. If you start from the application, that classification is more, such as laser range finder, 5000mw laser pointer外部リンク three-dimensional imaging radar, laser radar, laser detection radar and so on. Among them, the laser three-dimensional imaging radar contains our well-known laser mapping, as well as automatic driving in the single-line laser radar and multi-line laser radar.

In the current automatic driving, there are single-line laser radar and multi-line laser radar points. Due to the high sampling frequency required in the application, triangulation and pulse ranging are used in close and long distance measurements, respectively. Among them, the single-line laser radar mainly through a high frequency pulse burning laser pointer外部リンク range finder, plus a one-dimensional rotation scan to achieve the measurement. And its angular resolution can be higher than the multi-line laser radar, so pedestrian detection, obstacle detection (small target detection) and the front of the obstacle detection and so on, than the multi-line laser radar has more advantages. Multi-line program is also mainly for multi-channel single-line collection, which is also subject to volume and optical path restrictions.

First of all, the laser radar is used in infrared laser, this laser itself in the infrared band radiation is much lower than the visible light. Furthermore, the application will use a very narrow filter, directly to the strong background light filter, and then use infrared light to detect. So that we can get a high-quality lane line image, through the image of the gray, you can easily detect the lane line. In general, with a 20000mw laser pointer外部リンク radar to do lane line detection, performance will be better than the camera.



201753(水)

The Thulium Fiber Laser

The Thulium Fiber Laser

The stronger the laser energy, the stronger the irritation of the skin, the greater the degree of damage, the better the effect. As the Asians are more sensitive to light, laser exposure to high energy is also high risk, reasonable to set the laser energy size, the density of irradiation points is very important. After erbium laser irradiation treatment, because of the healing mechanism of human skin trauma, these target tissues as a repair center, epidermal new healing, dermal fiber thickening, skin comprehensive improvement. The current 1550 nm erbium 1000mw laser pointer外部リンク for rejuvenation (facial skin rough, thick pores, aging wrinkles), repair acne dents, repair scars (surgical scars, caesarean section scar, burn scar), stretch marks repair A very good effect. In addition, erbium laser can also be used for chloasma and seborrheic alopecia treatment.

The wavelength of the thulium laser is at the peak of the water absorption energy, and the closer the laser wavelength is from the peak of the energy absorption, the faster the energy absorption is. The more shallow the penetration is (0.2 mm), the irradiated tissue is rapidly vaporized and the thermal damage is minimal The As the heat damage of thulium laser tissue is small, the scab (shallow tissue block formed by living tissue shedding) is shallow, and the recovery time after operation is shortened, and it is easy to obtain pathological analysis. At the same time, the thulium fiber 3000mw laser pointer外部リンク with good beam quality, cutting better, positioning cutting the target plane more accurate, because the heat damage and small scab, so that the field is clear, for cutting / enucleation effect is very good.

A typical CO2 laser consists of a large amount of gas discharge from a mixed CO2 molecule. Due to the very close to the energy level of molecular vibrations and rotations, the photons emitted between these energy levels have low energy and long wavelengths compared to visible and near infrared (NIR) light. Carbon dioxide lasers offer power levels from milliwatts to tens of kilowatts, ranging from small instruments to high power cutting. And because the CO2 laser has a very high spectral purity, with <1kHz radiation width and no power trade-off, conversion efficiency of up to 10%. These features enable CO2 laser to address emerging applications such as material processing, photodetection and ranging (lidar), thermal visual aids, and targeted therapeutic medical applications.

The carbon dioxide burning laser外部リンク is a reasonable way to adjust the optical device because its output beam is highly absorbed by the LIGO optics and it can provide high wavelength purity and power stability without increasing the noise to the measurement. However, according to LIGO specific specific application requirements, the development of single-wavelength stable CO2 laser, suitable for real-time adaptive system is very precise control loop, accurate offset optical distortion. When the optical element is insufficiently compensated for thermal deformation, the CO2 laser beam is shaped as a ring to provide additional compensation (overtemperature correction), and if the optical element is over-compensated, the CO2 laser beam is shaped as a disk in the center of the optical element Compensation (under thermal correction).

While CO2 lasers can solve all the industrial needs of the era is coming to an end, we are facing new materials and increasingly demanding industrial processes brought about by the challenges that require a deeper understanding of the true value proposition of the high power laser pointer外部リンク, as well as the manufacture and sale of carbon dioxide lasers The different methods. In terms of manufacturing, this new paradigm closely matches the specific customer requirements using CO2 laser wide range specifications. In terms of marketing, from the original way of the average power pricing to customer-specific program pricing, such as pulse shaping, peak power, wavelength characteristics and operational stability to match the special materials and application requirements.

Laser light source also showed a rising trend, in fact, in the projector industry, this year's laser light source exposure is high, but because of the relationship with ordinary consumers, so the list of the rising trend of laser light is not obvious. In fact, the laser light source in the engineering market has a very good development, the current laser projection brand more than 20, more than 300 products, of which more than half of the project laser projection. This is the 2017 5000mw laser pointer外部リンク light source products outbreak of the most concentrated market, in addition to the field of laser TV, the number of new products is also a lot, so 2017 home laser products will continue to rise.



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