green laser pointer has the laser indicating function

green laser pointer  has the laser indicating function.
Ideal quench process in Figure 2 in curve 2: 650 ℃ or above should be slowly cooled to minimize the quenching of the thermal stress; the rapid cooling between 650 ~ 400 ° C, through the most unstable regions of austenite. avoid pearlite or bainite. Near the Ms temperature region below 400 ℃, it should be slowly cooled in order to minimize the martensitic transformation of stress. This ensures that the conditions of access to martensite, reduce the stress of quenched to avoid workpiece deformation or cracking. The characteristics of the laser quench to stop heating the moment the temperature reaches the highest, then cooled to 104 ~ 105 ° C / s cooling rate, is much larger than the maximum cooling rate (2000 ° C / s, and 2830 ° C / s) quenching medium for saline or alkaline. green laser pointer is the handheld devices.
According to the relationship between cooling rate and time can be inferred that the laser quenching the cooling curve of the steel ideal for quenching the left side of the cooling curve, curve 1 in Figure 2. Figure 3 shows the relationship between the organization close to the equilibrium state with temperature and alloy composition on the thermodynamics of iron-carbon alloy phase diagram. With slow heating rate of heating up the steel austenitic, can reach the level of close to balance. Austenite is generated generated by the nucleation and growth of carbide dissolution and austenite grain growth, are dominated by the diffusion process. In the laser heating process, when the heating rate is high enough (greater than 400 ~ 500 ° C / s). green laser pointer  can serve as laser indicators.The disposable type and the rechargeable type battery of green laser pointer is much easier
Products from different manufacturers, ATC, APC's technical content is not the same. If raw material costs, material costs of these two parts is quite low, but there are considerable technical content, evaluation of the functional circuit is good or bad, only to characterize the control accuracy; In addition, the job stability of the circuit is a important indicator. ATC control circuit of the model are generally one-way control, that is, only with refrigeration units capable of cooling heat and power rise in temperature by the heat generated by the laser work to maintain, in essence, whether it is the economic model, or professional type models should be adopted by a two-way temperature control for the best, but the economic models are basically one-way temperature control. APC control circuit to maintain constant optical power of the laser components, should be said that the low-end models and high-end models, the part of the circuit is almost little difference.Laser components and control. The models in the selection of laser can be said that the high-end laser spared no expense, are used in popular market, in order to ensure the indicators and the stability of the machine, the state of the laser settings are optimized The design is complete and will not appear in economic models.It is the complete set of green laser pointer
Clean fiber optic connector back to the adapter should be noted that the force fit, in order to avoid too much force to the adapter within the ceramic tube rupture.

This function will make green laser pointer more practical

 This function will make green laser pointer more practical and feasible.
But at an early stage, due to the poor performance of diode, solid-state lasers as the pump source immaturity. Until 1978 quantum well semiconductor laser concepts, MOCVD technology of the early

1980s, the use of strained quantum well lasers, the development of the LD step on to a new level. Since the 1990s, high-power LD and LD array technology, which greatly facilitate the a DPSSL

research. This article focuses on a diode-pumped solid-state lasers, first a brief introduction to the development of the LD array, and then combined with the author contact laser. All in all,

green laser pointer can be divided and classified into different types according to different standards.
Example describes the technical characteristics and development status of DPSSL devices emerged in recent years starting from the design of diode-pumped head. Diode-pumped solid-state lasers

(DPSSL) with traditional pump laser has the following advantages: 1. Long working hours. Traditional krypton lamp or xenon lamp life of only a few hundred hours, the longest not more than 2000

hours. Diode lasers for pumping life of up to tens of thousands of hours, thereby greatly reducing the maintenance costs of the user. Two. Low power consumption. Traditional lamp pumped laser

conversion efficiency of only about 3% of the pump lamp issued by most of the energy converted into heat energy, causing a great waste of energy. The LD DPSSL the issue fixed. green laser pointer

can be used in different locations as per different features and performances to meet various practical using needs and requirements. 
Next, the internal pump cladding, more outer layer of doped glass cladding of the cover, also has a lower refractive index. Structure of this fiber, multimode diode-pumped light through a composite

fiber terminal surface injection pump cladding propagation through the fiber structure, periodically through the doped single-mode fiber core and the core fiber inversion. IPG laser department (now

a branch of IPG Photonics) developed a more advanced reinforcement side parallel pumped fiber laser. It consists of an active optical fiber, the fiber and other optical components or gain stage

free fusion bonded polyhedra, so that the pump light from the multi-point injection cladding as possible. The model number of green laser pointer is ZMP005.
In this way, a simple optical output power in proportion to the zoom control to be feasible. The other side of the pump technology and V-groove coupling.

When the receivers USB interfaces of green laser pointer

When the receivers USB interfaces of green laser pointer are inserted into the computer cases. 
Such as: laser plastic deformation of quenched management, laser ultrasonic hardening, laser hardening in liquid nitrogen: laser plastic deformation hardening (LPDH) a combination of two processes

in one laser hardened and thermoplastic deformation hardening. Such combination of the following advantages: first, available with the special structure of the laser hardened layer; Second, get

help to improve the fatigue strength and wear resistance of to ensure that a comprehensive stress. The plastic deformation is caused by the roller in the surface of laser irradiation process. From

the process of research and analysis of the results obtained the following two conclusions: 1) LPDH is a method to improve the fatigue strength of machine components and resistance to wear and tear

in terms of promising. When green laser pointer are produced.
Compared with the laser hardened, LPDH microhardness higher 1500MPa, the depth of the hardened layer depth of 100-200? M. (2) laser ultrasonic hardening (of LUSH) laser irradiation in the

ultrasonic frequency vibration plastic deformation combined. This combination can make microhardness 3000 ~ 4000MPa, the surface morphology is also the result of such processing can be improved.

Laser liquid hard (LHLN), in liquid nitrogen. In the process, due to the large temperature gradient can improve the heat exchange of the irradiation zone, and can cause nitrogen to better penetrate

into the matrix material conditions, and significantly increase the microhardness of the material being processed, as shown in Table 1 below. 5.5 new laser absorption coating. We have matched their

frequency of green laser pointer for users.But the laser will produce smoke and odor, difficult to clear. In recent years, the United States with more than a grade Krylonl602 black lacquer, the main ingredients of the graphite powder and

sodium silicate or potassium silicate, spray method, the thickness of 10 ~ 20? M,. Domestic-ray machine developed by a 86-l black lacquer, has been supplying the domestic market. 2) phosphating

method) Figure 5-phosphate film after laser treatment and the role of the workpiece to indicate phosphating processing sub-high phosphate (90 ~ 98 ° C) temperature (55 ~ 70 ° C) and room

temperature phosphating Phosphide (approximately 25 ° C ).

The lighter weight of green laser pointer is needed

The lighter weight of green laser pointer is needed.
U disk storage devices, laser projector, its data capacity is limited only by the use of U disk capacity limit. A capacity of 128M U disk contains data for the laser projector is not repeated about

20 minutes. The data can be divided into up to 100 sets of data. Laser projection software, usually need to set the parameters of what? Most laser projection software will provide users with the

function of the parameter settings, so that users can reasonably produce satisfactory results graphics. But the basis for the initial contact with the laser projection, how to properly set these

parameters we must first understand the practical significance of these parameters. The weight of green laser pointer has been cut.The long-term reliability of green laser pointer can attract a lot

of customers
Below we have each of these parameters are introduced: the scan rate. This parameter is almost all laser projection software should be mentioned. Its meaning is the frequency of the computer sends

a signal to the laser scanner. For example, the scan rate is set to 24K (1K = 1000), the rate of 24,000 points per second means that the computer graphics signals to send to the scanner. Can allow

the scan rate was faster, the higher the performance of laser projection to. Projection graphics is not easy to flicker. In actual use is not set by the scan rate as high as possible. It is also

based on the output graphics users make an appropriate adjustment. The approval of green laser pointer has been finished.
Scanning step. Draw a shape with a laser projection software can draw graphics to discrete graphics track node. The so-called "step" is the distance between these points. Similarly a graphic, step

length the smaller the output graphics more "realistic", but the composition of graphics "node" number will increase. If too many points of the graph will cause the output graphics flashing. Step

length setting in conjunction with the "realistic" level of output graphics and graphics flicker and other factors considered. Another step settings, and scan rate. Under normal circumstances, the

faster the scan rate, the smaller the step size should be set? The approval of green laser pointer is very important.Abscissa is the flow, the vertical axis of time, the range of horizontal and vertical coordinates can be adjusted according. The carbon dioxide laser is the electrical

energy to stimulate a mixture of carbon dioxide molecules.

The parallel emission of the infrared light band of green laser pointer

The parallel emission of the infrared light band of green laser pointer can not be kept.
Diode laser frequency adjustment corresponds to a single gas absorption line. Laser spectral width corresponding adjustment to the single than the measured gas absorption line spectrum width narrower. By changing the current of the diode lasers, including the single absorption line of the laser wavelength is scanned emitted (see Figure A). During the launch of the laser scanning as a feature of the wavelength, the receiving unit to detect the light intensity will change and this change is only from the optical channel between the laser and the receiver under test gas molecules on the absorption of light. To detect single absorption line shape and size (see Figure A), used to calculate the gas content between the transmitter and receiver. The absorption lines of other gases does not appear in the selected wavelength range. The infrared light band can form a larger spot around the green light of green laser pointer .When every shift of green laser pointer begins
It occupies a unique position in the supersonic and hypersonic flow field studies, has become an effective diagnostic tool to study the combustion and flow. The laser gun diagnostic techniques. Laser Doppler velocimetry. Laser Doppler velocimetry (Laser Doppler volemeter-LDV) technology was developed in the mid-1960s. The basic principle is based on laser Doppler effect, the use of moving particles scattered light frequency shift to measure the speed, because the frequency shift of the scattered light contains the information of the particle velocity. Laser Doppler velocimetry of the process consists of the movement relationship between the three stationary particle of light, movement and stationary optical detector. The high spatial resolution of the LDV technique can measure the flow rate within a very small volume.
Often in aircraft engine design developed by many of the traditional methods can not solve test problems, the development of laser diagnostic techniques for aero-engine design and fault diagnosis has brought great convenience, a good solution to these problems. The temperature field measurement techniques. The traditional methods of measuring temperature is the point most of the measurements, there are many limitations, such as temperature measurement: the degree can not be too high, contact measurement: the destruction of the flow field, unable to obtain information for the entire temperature field.

The output of green laser pointer is very high for this workshop

The output of green laser pointer is very high for this workshop.
As a result of digital technology, in addition to a substantial increase in image quality, image processing can also use some better algorithms, which can eliminate reflective shiny surface of aluminum alloy, stainless steel, galvanized sheet, interference, clearly identify details of the fillet weld, V-shaped groove joints, shown in Figure 4. Achieve precise tracking and accurate measurement of the joint gap, the geometric parameters of the wrong side of the groove cross-sectional area. Figure 4a in the laser stripe exposure to stainless steel surface of the fillet weld, the image in Figure 4b for anti-reflective technology, Figure 4c for the anti-reflective technology to obtain images. The manufacturer has the most experience in producing green laser pointer .
Figure 5 is an application example in the TX / S digital laser vision sensor adaptive welding of large components in the aerospace aluminum alloy. Automatically pair and a high degree of automatic adjustment of laser vision sensors to detect the geometric information in the groove to be welded, of torches, and at the same time optimize the welding parameters automatically according to the detected groove clearance and cross-sectional area and adjust the line. Figure 5a shows the main components of adaptive welding system. Figure 5b shows the TX / S sensor very light aluminum V-shaped groove on the test results, the complete elimination of reflective and accurately measure the gap, the parameters of the wrong side and cross-sectional area. It is among all kinds of laser technologies of green laser pointer .
Use of high-speed and high-precision laser vision sensors to scan the surface of the weld, the weld surface of the 3D image by a certain algorithm can measure the weld shape of the geometric parameters such as weld width, I, the weld toe angle, but also detect undercut, weld the tumor and the surface porosity and other defects, as shown in Figure 6 and Figure 7 below. The ARC-SCAN and LAS-SCAN sensor system for arc welding and laser welding, weld or sealing seam detection, in line with the needs of 6σ quality control. To detect weld width, I undercut weld in the weld inspection, in addition to forming the geometric parameters. The production stream line of green laser pointer is in the direct charge of the director.
green laser pointer is for the teacher to indicate the teaching content
But also to detect small weld porosity and other surface defects. Dual-sensor technology, laser vision sensor, a laser stripe projected on the weld by the two sensors for distance measurement image.

Other performances of green laser pointer are needed to be debugged

Other performances of green laser pointer are needed to be debugged
When the absolute value of the small defocus amount, the laser spot diameter and laser power density, faster expansion of solder bath, but the small diameter of the initial key-hole; the opposite case, the larger defocus amount, the initial the diameter of the Keyhole, but the molten pool expansion slows down, the solder joint size is not necessarily great. A certain laser power and welding speed, only the focus is within the best position to get maximum penetration and good weld shape. The impact of deep welding process parameters and the effect of heat conduction welding and deep penetration welding quality difference between the heat conduction welding and deep penetration the most basic difference is that the former pool surface and remain closed, while the latter bath is a laser beam to penetrate into holes. There are some specific and professional requirements towards green laser pointer .
Welding thermal conductivity of the system disturbance smaller, because the radiation of the laser beam does not penetrate the welded materials, so in the conduction welding process to weld difficult to be gas-invasive; deep penetration, the continuous closure of holes can lead to holes . The influence of the plasma in deep penetration welding process, high power density laser beam to the workpiece surface, the material is quickly melting evaporation, the formation of steam clouds above the workpiece. In the process of leaving the surface of the workpiece at high speed steam clouds located in the incident beam path by heating, under certain conditions will be quickly ionized plasma is produced. Plasma on the laser absorption, refraction and scattering. green laser pointer used for the star gazing can be the green laser pointer.
Therefore, in general the top of the molten pool of plasma weaken the laser energy to reach the workpiece. And influence the beam focusing effect on the welding. Usually a secondary side of the inflatable to get rid of or weaken the plasma. Used as an auxiliary gas such as Ar, He, N2 and CO2. Different auxiliary gas to suppress the ionization potential of the plasma effect of the gas, thermal conductivity and dissociation energy and so on. When the auxiliary gas flow rate less than the critical flow, the gas ionization potential to play a leading role. The highest ionization potentials of these four gases He, the corresponding order of He (24.5eV), Ar, (15.68eV] 2 (14.6eV) and N CO2 (13.8eV), it is felt that He inhibition of plasma best. The customer can choose the suitable green laser pointer according to the needs and tastes.

sometimes the laser beam self-focusing phenomenon

green laser pointer can be commissioned and adjusted for the customer
Wavelength 10.6μm CO2 laser welding of the absorption rate of two orders of magnitude higher than the absorption of the YAG laser wavelength of 1.06μm. Absorption rate, the different wavelengths

of laser-produced plasma power density required threshold. YAG laser-produced plasma threshold power density is about two orders of magnitude higher than the CO2 laser. In other words, the CO2

laser processing, easy to produce plasma and its impact, while a smaller impact of YAG laser processing, plasma. Laser beam through the plasma, the change of the absorption and focusing conditions,

sometimes the laser beam self-focusing phenomenon. Plasma absorption of light can be transmitted through different channels to the workpiece. The high performance laser module of green laser pointer is also critical to the quality.
Wall focusing effect generated allows the laser to maintain a high power density within the hole, and further heating the melt material. Important for the laser welding process, the laser power

density in the remaining holes at the bottom of it must be high enough to maintain the bottom of the hole high enough temperature to produce the necessary vapor pressure to maintain a certain depth

of the hole. Focusing effect appears to generation and wall of the pinhole effect, can dramatically change the process of laser interaction with matter, when the beam to enter the holes, the holes

is equivalent to a light absorbing black body, and greatly increase the energy absorption rate. Purifying effect of purifying effect of the CO2 laser welding, the weld metal of harmful substances

reduced or mixed with the material to reduce the phenomenon.
Defocus amount of welding quality. Laser welding is usually away from the fuss about because of the high power density of the laser focus at the spot center, easily evaporate into the hole. Leaving

the laser focus plane, the power density distribution is relatively uniform. Defocused mode in two ways: positive and negative defocus defocus. Focal plane at the top of the of the workpiece being

away from the focus, and vice versa for negative defocus. According to the theory of geometrical optics, when positive and negative away from the focal plane with the welding plane equidistant,

corresponding to approximately the same power density on the plane, but the weld pool shape actually. Negative defocus, the availability of greater penetration, which is related with the formation

of the molten pool. Solution heat treatment the steel is heated to 1050 to 1150 ℃, homogeneous single-phase austenite, and then rapid cooling and high-temperature supersaturated

solid solution state remains to room temperature.

If the power of green laser pointer is focusable

If the power of green laser pointer is focusable
At this point, users can capture images, and arranged to print the serial, but the camera can perform other printing tasks required to complete the calibration print before. S13 contrast camera ongoing contrast test print. At this point, users can capture images, and arranged to print the serial, but the camera needs in complete contrast test print before you can perform other printing tasks. S14 density camera ongoing density test print. At this point, users can capture images, and arranged to print the serial, but the camera can perform other printing tasks required to complete the density test print after. At this point, the user can see the error message is displayed in line 2. It is the warning of using green laser pointer in the appropriate way.
Users can continue to capture images and included in the print sequence, but only to eliminate the error message, the system will start printing. S21 door open the front door open. The user can continue to collect images and arranged to print the serial, but the system needs in the front door is shut down will start printing. S22 hood open the top cover open. The user can continue to collect images and arranged to print the serial, but the system needs to shut down in the roof will start printing. S23 doors open the front door and top cover is open. The user can continue to collect images and arranged to print the serial, but the system needs in the front door and top cover closed will start printing. When the star gazer uses green laser pointer to observe the star.
S24 crtg poeng front door is closed, the system is to open the film box. The user can continue collecting images and arranged to print the serial, but the system needs to be fully opened in the film box will start printing. The S25 crtg clsng system is shutting down the film box, the front door will open. The user can continue collecting the image, and arranged to print the serial, but the system needs to re-open the film box and the front door is closed it will start printing. P116 pickup fail system to take the piece failed, retry printing. If such an error occurs repeatedly, the user can take the tablets fault part of the help content, please see the # 1 District. (5-11) P118 elevator fail the front door closed, cassette upgrade did not return to the place. The customer should pay attention to the use safety and security of green laser pointer .
Reboot (shutdown after 5 seconds boot) P119 feeds err area. 2 to send the chip area of the film blocking. See how to eliminate the # the contents of the film blocking part of the Zone 2 (5-12) P121 print error due to system failure, can not perform the print operation.

The sales group of this laser pointer company is very strong

The sales group of this laser pointer company is very strong and powerful.
The use of robots, the wrench of the clamp grasping device must be large enough in order to seize a large workpiece clamp grasping device must be equipped with smart sensors (sensory and visual), the height used to detect stack components. The solution is the use of epoxy carbon fiber to make the clamp grasping device, with many small suction cups and miniature inductive sensors. In order to be able to draw multi-block processing board, the use of a slight tilting movement of the cylinder is applied to the clamp grasping device. Laser flexible manufacturing system, ASR (effective supply rate) warehouses to store the processing board. More than one level of ASR warehouse at the same time for 1-3 machining centers, machine tools without having to install their own pallet. This type of laser pointer will bring the great profit to the laser pointer company.
The manufacturer should indicate the level of the laser radiation may be close to, and recommendations on each case (if appropriate) security program. Training, planning and program verification during the period of protection. Should be avoided during validation of the training, planning and program personnel close to the laser radiation above the Class 3A AEL. If you can not satisfy this condition, you should meet the protection requirements of the maintenance period. Control devices and control circuits should comply with the requirements of GB / T 5226.1. The laser processing machine shutdown switch should enable the processing machine downtime (actuators power), or isolate the laser beam or laser beam is no longer generated. Laser stop switch should enable the laser beam is no longer generated. Laser system and the rest of the processing machine, you can use a separate control device. The defect of laser pointer can be easily eliminated.
Emergency termination of the switch should be consistent with the requirements of GB / T 5226.1. Emergency termination of the switch should be able to at the same time: the laser beam is no longer generate the laser shutter and automatically put in place; processing machine downtime (actuators power); cut off the laser power and the release of stored energy. If several processing machines share a single laser and machining work independently of each other independent of the installation in a machining emergency termination of the switch should work as something like the above requirements, or the processing machine downtime (actuators off electricity), while cutting off the laser beam leading to the processing machine.

The wholesale price of green laser pointer is much lower

 The wholesale price of green laser pointer is much lower than retail price of green laser pointer .
Under the trend of energy saving needs of the climate conference in Copenhagen in 2009 energy saving again become the focus of global concern, and to people because of rapid industrial development of the environmental pollution has become more in-depth understanding of global development has become the subject of today's . Meanwhile, after the economic crisis, China's rapid economic rebound and continued to expand domestic demand, such as automotive electronic components caused by the revitalization plan to support the policy of nationalization, home appliances, energy subsidies, trade-in, which greatly boosted the automotive electronics, energy-saving appliances, medical electronics, mobile communications industry; and vigorously promote low-carbon economy, continue to emphasize energy conservation, energy demand will continue to enhance products, energy efficient products in the subsidies will also have stimulated the rapid development of , January 2009, inverter air conditioner was officially included in the "energy-saving products in government procurement list", will allow us to air in 2010, ushering the era of high energy efficiency. The cell phone can not be used during the sleeping time because green laser pointer is on.
Thermistor devices have chip miniaturization, high precision, low power consumption, according to the temperature coefficient of resistance can be divided into negative resistance temperature coefficient (NTC) and positive resistance temperature coefficient (PTC) thermistor; the operating temperature range , resistance increased with increasing temperature is the PTC, the traditional TV and monitor applications, mainly in the degaussing circuit; resistance decreases with increasing temperature is the NTC, the temperature sensor on the main application, the accuracy can reach 0.1 ℃, thermal time can be as little as 10s or less. As high technology, thermal electronics market fundamentals for the monopoly of foreign enterprises, German, Japanese companies, the world's total output value of about 60% -80%. NTC temperature sensor as a sensor, accounting for more than 40% of total demand, NTC thermistors based on its excellent price-performance ratio the proportion of components in temperature up to 60% or more. The parameter of green laser pointer can help with the manufacture of green laser pointer .The development of electronic packaging materials, has been showing rapid growth, global market, involving the development, production of high-end liquid epoxy encapsulation materials demand in 2003 reached 700 tons, with sales of $ 350 million; 1500 tons in 2005, sales amount of $ 750,000,000; 8000-10000 tons is expected in 2010. China's market demand in 2003 is about 50-60 tons, 400-500 tons in 2005 up to 1200-1400 tons in 2010.

The material inquisition sheet of green laser pointer

 The use of the laser device object, there are many appropriate professional models, such as buttons for laser marking machine, laser detonators special coding machine, bearing special laser coding machine, crystal special laser marking machine, laser liner special heat treatment machine and so on. Although China's industrial laser products and markets have seen significant development, but there are some problems. Such as the rush to produce a particular type or a product, resulting in product prices deviate from its value, the market turmoil; investment in R & D funding is inadequate; technological progress than other countries; some components imported; lack of effective measures to protect intellectual property rights. The material inquisition sheet of green laser pointer needs the signature of the director of the workshop.
However, laser products and applications have been deep into all walks of life, families, and become the new century's most popular and most promising technology and industry. Laser processing robot is the 21st century, the international advanced manufacturing technology. An overview of the principle of laser robot, composition, type and number of major industrial applications. Discussion focuses on some key laser processing robot cell technology - optical fiber transmission of high power laser technology, robot body technology, robot programming, robot intelligence, and network technology and reverse engineering of 3D reconstruction of repair (3D) morphology of technology. Laser processing robot made some important future development direction - high-power laser remote processing and flexible manufacturing technology, machine vision and hearing capabilities with intelligent control technology and remote monitoring of network management technology. The warehouse needs more room to accommodate more green laser pointer .
The rapid development of laser technology in recent years, emerged into the flexible machine can be coupled with fiber-based transmission of high-power industrial lasers. In the field of advanced manufacturing intelligence, automation and information technology advances to promote robotics and laser technologies, especially in the automotive industry needs to drive the laser processing robot industry, the formation and development.

All receivers of laser pointer will store the same address code

All receivers of laser pointer will store the same address code
Therefore, to develop the TFT-LCD related materials has become the common and urgent tasks of the industry. Nano-information materials is an important part of nano-materials, and electronics, optoelectronics and communications technology, computer technology is closely related. February 2000 published by the United States National Nanotechnology Initiative, said: "nanostructures will nurture a revolution in the IT hardware, similar 30 years ago that a microelectronics revolution that a revolution in semiconductor Electronics replaced the vacuum tube electronics; the coming of a nanoelectronics revolution, millions of times more the Supermicro transistors and memory chips will improve the speed and efficiency of the computer.
Self-organized quantum dot lasers. Since 1971 molecular beam epitaxy grown GaAs potential well, and AlxGa1-xAs after the barrier of quantum wells, quantum confinement effects in quantum wells has been extensive and in-depth study, and on this basis developed many new high-performance optoelectronic and microelectronic devices, such as: heterojunction lasers, quantum well lasers, optical bistable devices, infrared detectors, high electron mobility transistors and heterojunction bipolar transistors, have been entered the practical stage, and some have been formed products. A large number of semiconductor lasers used in fiber-optic communications, CD-ROM access, monitor, etc.. As the use of the quantum confinement effect and bandgap engineering design.
The reason is that the quantum dot preparation process is not perfect. In order to improve the performance of quantum dot lasers, but also the need for manufacturing technology to make significant improvements in-depth study of the physics of quantum dots. Silicon-based materials. Silicon is the main material for microelectronic devices, low prices, devices and integrated circuit processing technology is mature, with the incomparable superiority of other semiconductor materials. However, silicon is an indirect band gap semiconductor, its luminous efficiency is very low. If you do use silicon light emitting devices, and on the same chip with other optical components, microelectronic devices, to achieve optoelectronic integrated. Will undoubtedly show that the communications, computer and other far-reaching impact. The laser pointer can burn the match or other materials.
For example, the time lag caused by the electrical interconnection between the devices has become a bottleneck for the development of ultra-LSI. Use optical interconnects to replace currently used by the electrical interconnection of integrated circuits can greatly improve performance, increase computer speed. 1990 Hom Han (LTCanham,) found that the luminescence of porous silicon, has opened a new prospect for optoelectronic integration on silicon.