The Importance of Servo Motor for Laser Cutting Machine

Servo motor in the strongest laser pointer cutting machine is a very important component, his quality is also a direct decision on the stability of the use of equipment, especially in the deformation of the contours of the processing, it can be said to be important. In addition to its own stability, there are many external factors directly affect the normal operation of the servo motor.
For laser cutting machine, whether it is flat or cut pipe cutting, you want the equipment in accordance with the established graphics processing, the key is to participate in the processing of the dynamic response of the various axes of the level and the coordination between each other. If the overall response of each axis is too slow during processing, or if there is a situation where the axis deviation is small and the other axis is large, the deformation of the contour will occur. There are many reasons for the occurrence of such inconsistencies, mechanical, external, servo response, control system and other factors, or multi-factor superposition. Therefore, the key to solve such problems is that each axis has good dynamic response and coordination between each other, so that it can be more strictly in accordance with established goals for burning laser pointer processing action. Servo motor as a mechanical and control system to undertake the middle of the implementing agencies, to a certain extent, make up, optimize and coordinate the action of each system to achieve a more perfect control purposes.

In addition to the stability of the servo motor itself, the external factors that affect its normal operation include:
Mechanical factors. Mechanical problems are relatively common, mainly in the design, transmission, installation, material, mechanical wear and so on.
Mechanical resonance. The greatest effect of the mechanical resonance problem on the servo is that it can not continue to improve the responsiveness of the servo motor, thus operating the device as a whole in a relatively low response state. Such problems in the synchronous belt drive machinery is more common, and other3000mw green laser long-distance ball screw sometimes have such a situation. The main reason is the rigidity of the timing belt is low, the resonant frequency is low, the long distance of the screw itself inertia is large, and there are many deformation cases, especially in the case of small motor capacity selection is relatively easy to start vibration. At the same time the installation of the assembly process and the quality of the merits of the mechanical resonance will also have an impact.
Mechanical jitter. Mechanical jitter is also a natural frequency of mechanical problems, usually more often appear in the single-ended fixed cantilever structure, especially in the acceleration and deceleration phase performance is particularly evident. Low-frequency jitter in the workpiece will show a large wave-like form, the higher the frequency of jitter will be jagged form.
Mechanical stress, external force and other factors. Due to the difference in mechanical material and installation, the mechanical internal stress and static friction of the drive shaft on the equipment may be inconsistent. If the internal stress or static friction of a shaft involved in the two green astronomy laser axes of the trajectory interpolation control is greater, the torque of the servo will be consumed to some extent, causing the acceleration of the shaft to slow down, resulting in processing contours Deformation. Normally we can observe the internal stress problem of the drive shaft by feedback from the servo driver.
The effect of external forces on the shaft is also similar. The general plate cutting machine, the shaft and the workpiece is non-contact between, may be limited by the external force. But some pipe cutting machine, tube axis will participate in the cutting time of interpolation, while the other axis is generally non-contact. At this time due to the impact of the pipe by the fixture will produce a reverse force on the tube axis, so participate in interpolation control of the two-axis force situation is inconsistent, the cutting effect will certainly be affected.
Numerical control system factor. In some cases, the servo debugging brightest laser pointer effect is not obvious, this time may be involved in the adjustment of the control system. Laser cutting machine processing speed is usually relatively constant, in the straight line and the curve are the same speed. This is not a big problem in the linear motion, but in the curve, especially the small size of the arc may be due to excessive acceleration caused by contour deformation of the situation.
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Fiber Optic Transmission System Helps Industrial Ultrafast Laser Processing

Today, fiber-optic beam transmission technology has become a high-power solid-state continuous (CW) laser can be widely used in industry-driven core, but the technology can not be applied to ultra-fast pulse laser. The emergence of micro-nanostructured hollow fiber makes it possible for high-energy picosecond and femtosecond pulsed burning lasers for sale to be confined to their tiny hollow core structure for excellent beam quality. When encapsulated in a sturdy cable case, it may mean a new era of laser transmission to open.
At present, the space optical transmission is widely used in these new ultrafast laser applications where the pulse width is several picoseconds and the pulse energy meets the material processing requirements. These lens-based systems require tedious fine-tuning (especially long-haul transmission) and are subject to dust and particle contamination. In the entire optical path, a large number of optical components become a potential source of beam quality loss. In addition, this type of processing equipment generally requires a sturdy workbench of stable abutment structure, the laser must be as close as possible to the processing position, in the overall system design which means the need to spend a lot of cost and experience.

The lack of a standard beam-transfer solution results in a wide range of system design options, which greatly hinders ultra-fast red laser pointer from reaching a wider range of industrial applications. Replacement of the laser light source or other components requires the re-adjustment and calibration of the entire system, which ultimately undoubtedly increases the cost. Fiber-based beam transmission system can not be achieved at present, mainly due to the traditional fiber is not suitable for transmission of ultra-fast laser. Self-focusing, stimulated Brillouin scattering and Raman scattering are the main factors that limit the pulse width and the damage threshold. And other non-linear effects, will easily damage the fiber material or pulse waveform. As a conclusion, ultrafast pulses for industrial applications can not be transmitted through conventional glass fibers.
Microstructured hollow-core fibers (MHCFs, see Figure 2) support the transmission of light in a hollow core, such as an inflation or vacuum, which allows it to transmit very high power and completely eliminate Nonlinear effect. This fiber from the photonic crystal fiber (photonic crystal fibers) evolved, the earliest from the University of Bath (Bath University) Russell, Knight and Birks jointly developed. Since then, a variety of different types of micro-nano-structured fiber has been developed and proved its ability to transmit high-power ultra-fast strongest laser pointer potential. Such fibers have a core size similar to single-mode step-index fibers, and the core constraining the light behaves like an irregular crystal. But the difference is that its core length can be greatly extended, and bear a higher damage threshold. 99% of the laser light is conducted in its hollow core and the allowable pulse energy level is increased to the mJ level, well above the energy levels required for many materials processing.
With the proper integration of these fibers into an industrial beam transmission system, ultra-fast laser pulses of several hundred watts (multi-100W) and several hundred micro-joules (multi-100μJ) can be reliably guaranteed with perfect beam quality transmission. This beam transfer system allows the laser source and the specific application to be separated, the laser energy can be distributed to different workstations, and even flexible robot system has become a reality, these are undoubtedly greatly enhanced the possibility of industrial applications. Hollow-core fiber is very suitable for femtosecond pulse width because of its extremely low dispersion characteristics. An attenuation value of 30 to 70 dB / km or 1% per meter is achievable in the 900-1100 nm spectral range.
Improve the green laser pointer transmission efficiency, and improve the optical output of the beam quality. Because the focus after the spot is very small, the calibration range of only a few microns, the whole system of mechanical positioning and stability are made of high requirements. According to the different laser sources, the divergence angle of the optical system is close to the diffraction limit, and the focal position is the Gaussian energy distribution. But in any case, to meet such a mechanical stability and image quality requirements, from the current high-power continuous laser coupling technology, are already very mature.
The internal optical fiber itself is well protected, and the outer, solid casing can withstand the millions of bending of industrial robots or gantry mechanisms. The mechanical stress is reduced to a minimum, even in a roughing environment that is full of particles. Dust and moisture are not allowed to enter the fiber inside, otherwise it will reduce the performance and even damage to the optical fiber.
In the end of the cable connector has a protective glass to ensure that the internal sealing, it is a certain distance from the fiber-optic distance, to avoid the pulse energy to destroy its coating or material. The enclosed cavity of the cable can be filled with clean air or any other gas, with a certain positive pressure or a complete evacuation. The clamping members of the fiber 30mw laser pointeritself provide good thermal contact, and the optional water cooling feature provides efficient heat dissipation at high power levels. Precise fiber end-face calibration takes into account the error generated when replacing the fiber optic cable, in the replacement of the same cable almost no need to fine-tune the output focus again.
A new flange interface provides extremely high mechanical repeatability and fast connection. At the same time, O-ring provides an effective security protection to ensure that the general industrial manufacturing environment. In addition, the optical cable can have the same high-power continuous fiber optic cable with the same security features, protective casing can guarantee that when the internal fiber breakage will not have any buy laser pointer leakage. Fiber-optic breaks, interface connections, and coupling status monitoring are also available, according to industry standards.

IPhone 8 or New Laser Sensor for Face Recognition

According to investment bank Cowen analyst Timothy Arcuri (Timothy Arcuri), said the face and gesture recognition may be released later this year, Apple's iPhone 8 mobile phone features of the two. He believes that for these functions, iPhone 8 fuselage will Xintian a sensor.

Arcuri said in a research report, is expected to iPhone 8 will include a 5.8 inch model configuration, OLED surface display, support wireless charging function, support some form through the new green laser pointer sensor and infrared sensor is located near the front camera / facial gesture recognition function, Touch ID fingerprint sensor is integrated in the bottom of the screen.
Arcuri predicted in the report, the new iPhone upgrade cycle will pull iPhone sales hit a new record. Although Apple's software, including Photos support face recognition technology, but iPhone, iPad or Mac has not yet provided Arcuri described face recognition function. There are not many rumors about iPhone 8 with face recognition function.
Sources said the new generation of iPhone contains a slight increase in performance of 4.7 and 5.5 inches models, may be a new increase in red color, or 5 or 5.8 inches model configuration OLED display. If a new generation of iPhone is indeed integrated with a red laser pointer sensor, support for face recognition, Apple may use it as a security measure, or for the purpose of augmented reality.
In addition, there are rumors that iPhone 8 will have a more powerful waterproof features, support for wireless charging, high-end models will adopt a new design.

Analysis of Laser Cutting Industry Chain in China

Laser processing (including laser cutting, welding and surface treatment, etc.) is an advanced production technology. Chinese laser processing industry is marching forward, this term has become a high-tech laser real social productivity, "the development of high-tech, realize industrialization" has become a reality Chinese laser processing industry.
As a new type of light source, the laser has the characteristics of good directivity, high brightness, good color and high energy density. Laser based laser pointer industry is developing rapidly in the world. It has been widely used in industrial production, communication, information processing, medical and health, military, cultural education and scientific research. According to statistics, from the end of the fiber to the common bar code scanner, each year and laser related products and services market value of up to one trillion dollars.

The laser industry has formed a complete and mature industry chain distribution, upstream mainly includes laser materials and matching components, mainly for middle and supporting all kinds of laser equipment, laser application in the downstream products, consumer products, instruments and equipment. The domestic laser market mainly includes laser processing equipment, optical communication devices and equipment, laser equipment, laser, laser medical equipment, laser components, application lies in industrial processing and optical communication market, both of which occupy nearly 7 of the market share.
At present Chinese laser industry is mainly used in laser processing, medical and other industries, the field of scientific research and development accounted for 12%, accounted for 32% of the field of material processing, communications accounted for 12%, accounted for 14% of the information field, medical field measurement and other areas accounted for 20%, accounted for 9% and 1%. As of now, a total of 5 national laser technology research center, more than and 10 research institutions; 21 provinces, municipalities and the production and sales of green laser pointer products, perennial styling products production and sales, and formed a certain scale of unit more than and 200. The domestic laser industry has formed a complete industrial chain, which is composed of laser crystal, key components, matching kit, laser, laser system, application and development, public service platform and so on.
Laser processing industry in China can be divided into four industrial zones, the Pearl River Delta, the Yangtze River Delta, central China and the central Bohai region. With the emphasis of these four industries, the Pearl River Delta in small and medium power laser processing machine, the Yangtze River Delta with high power laser cutting welding equipment, Bohai high-power laser cladding and solid-state laser, led by Wuhan, the central region is covered with large, medium and small laser processing equipment. With the transformation and upgrading of China's manufacturing industry, some of the old industrial base and small business base, began to transform the high-end manufacturing sector. For example, the Wenzhou laser industry cluster and Anshan vigorously develop the laser industry, etc..

Since the "65" countries have given special attention to laser technology, so there is today's booming China's laser industry. Now, the development of laser technology and industrialization in the world is very fast. Mature technology is more and more mature in gas lasers and applications. In the field of solid state lasers, new materials are emerging, and the new burning laser pointer technology is also developing. To keep up with the pace of development in the world, to provide technical support and Everfount talents for China laser industry support, we must strengthen the construction of laser technology innovation base, especially the construction of innovation base.
To maintain the technological development trend with the international advanced level, and to break through some key technologies to solve the bottleneck restricting the development of laser technology industry in China. Closely integrated with the main battlefield of the national economy, the transformation of scientific and technological achievements, commercialization as the core, focusing on the key technologies to solve the laser unit device, system integration and processing technology. Increase the development of new products, to provide technical reserves for industrial development.
For laser cutting and laser welding, using optical devices, optical system and laser processing equipment components, to provide new technology, new design and new prototype, fast flow CO2 laser, focus on the development and production of high power all solid axis YAG laser, new mobile laser processing machine and laser composite welding technology. The specific measures are as follows: to establish a research platform of common technology for automobile plate cutting and welding metallurgy of steel roll; broadband heat treatment, surface cladding, laser welding of steel in metallurgical industry equipment, laser texturing equipment; underground pipelines of high power laser pointer processing in petroleum industry. The localization, serialization, generalization and standardization of key common technology and related equipment. To establish a new type of laser research and development platform, through the introduction of foreign fast axial flow CO2 laser technology, improve the domestic high power CO2 laser production capacity and product quality, based on the absorption of CO2 laser has introduced a high quality, high stability and high power. Focus on the development of RF excitation, fast axial flow CO2 laser and more than million kilowatts, the development of multi wavelength high power solid-state laser (>1kW), 100 ~ 1000W laser diode pumped solid laser and ultraviolet band. Focus on the development of pump modules, and strive to build a more comprehensive DPSSL production base in the country.
On the basis of many results obtained by the past, in recent years, the research on the three levels of system integration and application, high stability of laser and laser model and Realization of industrialization has made a breakthrough, but the industry still needs to solve the problem.
Integration and development of the system integration and development of the core of Wuhan laser processing industry. System integrator is a region, a leading industry development, only the strength of the system integrators grow, the entire industry can be driven up. Integration of system integration is the purpose of each enterprise has its own characteristics and advantages, there is a certain competitive relationship between each other. According to the characteristics of the current system integrators, may wish to set up solid 50mw laser pointer equipment, laser cutting equipment, laser medical equipment, large-scale laser processing equipment and laser processing stations and other forms of system integrators, owners of existing enterprises become the company's investment, in the process of integration of the existing system integrators, the government should play a good intermediary and service roles, create opportunities for enterprises to mature conditions on listing and financing, further optimize the structure of property rights, to lay a good foundation for further development.
Perfect supply chain was born and grow a number of parts suppliers with core technology. The basis of an industry is supported by many parts suppliers. For the Wuhan area, so the parts suppliers should include group optical devices (such as optical lens, focusing lens, reflector and optical fiber etc.), precision machining, laser power and precision of electronic and electrical etc.. At the same time, these parts suppliers should have the core technology of the field, which is important to promote the whole laser processing industry. Supporting enterprises is the basis of an industry, in particular, to master the core technology and have independent intellectual property rights of supporting enterprises, to promote the role of industrial development.

The introduction of a high starting point of digestion, encourage the development of a number of supporting enterprises is the first to encourage enterprises and research institutions cooperation, which is more efficient way; secondly, enterprises should focus on the development of technology trends, continuous innovation; third, development of government through the science and technology project plan arrangement, tax policy and other means to encourage supporting enterprises. Increase market dynamics, which requires systems integrators in the promotion of 1mw laser pointer processing technology and the establishment of market networks have greater investment, including in a certain time to open up overseas markets. Through the promotion of the application, technical radiation and personnel training, in the domestic establishment of laser processing demonstration application of the sub center, processing station, joint venture company, to promote the development of laser processing industry in china.
Capital platform domestic capital: the diversification of equity investment, the introduction of listed companies, state-owned investment companies, private capital; foreign capital: in Wuhan, Optics Valley, China, the proportion of foreign investment in the field of energy optoelectronics is very small. The introduction of foreign capital can start supporting industries to foreign investment, after all the technical advantages in most related with energy photoelectron matching field, and unlike the investment investment system supporting the integration as big; foreign: the proposed state and local governments to establish regional laser processing industry and the increase financial support strength, making full use of the structural characteristics of domestic the economy and society with high efficiency as the goal, application of advanced manufacturing technologies, high efficiency 5mw laser pointer, laser processing production line design and manufacturing with international leading level. The introduction of foreign advanced technology and capital, the establishment of a number of production lasers and complete sets of equipment joint venture, in order to improve the level of laser products.
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Industrial Applications of Micro Lasers

The combination of silicon materials and light emitting semiconductor materials is expected to help develop a new micro scale laser pointer, which is studied by Keh-Ting Ng Doris and colleagues at the Data Storage A*STAR Institute.

Silicon material completely changed the form of electrical equipment manufacturing. This semiconductor rich is easy to be processed into small components, such as transistors, and method which is used can be extended to the level of manufacturing industry, which makes the production of tens of thousands of components can be integrated on a single chip. Electronic engineers want to further expand the capabilities of these integrated circuits, so that they can create, process and detect light.
These optoelectronic devices can speed up the processing speed of digital information, and can realize the micro scale laser, for example, can be used in bar code scanner. The problem, however, is that the silicon material is not an effective light generator. Ng's team has designed and produced a combination of silicon and light emitting semiconductor green laser pointer, which are indium gallium arsenic compounds (InGaAsP). "Our results show that this method can achieve a high efficiency and compact active optoelectronic device for silicon substrate, that is, using a very thin III-V family of semiconductor silicon layers," Ng said.
One of the important considerations in any laser structure is the ability to capture light within the structure, namely, the ability to capture light in order to further drive the generation of light. In conventional lasers, this is achieved by placing a mirror on any side of the light producing area. Instead, Ng and the team used a cylindrical geometry device. This will capture some of the light that is generated on the wall of the device and force it to spread within the cylinder. This is called whispering gallery mode, because the same effect will occur in a circular room, such as the dome of the cathedral in the sound wave.
The team started using a silicon substrate, they deposited a thin layer of silicon oxide. Thin film with optically active InGaAsP, only 210 nm thick, is individually made, and then bonded to silicon oxide. Then, the team through a number of materials to create the cylinder, with two or three microns in diameter. Three micron devices emit a 30mw laser pointer light at a wavelength of 1519 nm, which is very close to the wavelength used in commercial optical communication systems.
This device has a unique feature that extends the whispering gallery mode to the silicon and InGaAsP regions. InGaAsP can provide light amplification, and silicon can be passive guide light. "The next step, we want to apply these ideas to the devices at room temperature," Ng said. "Operation at higher temperatures will require adjustments to the design and fabrication of the laser."
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Application of Ultrafast Fiber Lasers in Special Materials

The market for fiber lasers is further enhanced by new applications compared to the market share of conventional lasers. Researchers are also applying ultrafast fiber laser pointer technology to multi-user applications, such as the Stanford SLAC National Accelerator Laboratory in Stanford and the Lawrence Berkeley National Laboratory in Berkeley. All in California. The development of synchrotrons and free electron lasers (FELs) has provided researchers with access to brighter, shorter X-ray sources. Over the years, the Stanford Synchrotron Radiation Source (SSRL) provides X-ray pulses to study the molecular and crystalline structures of materials. Recently, a "low-alpha mode" of research and development, X-ray pulse can reach 1 ps.
At the same time, the linear accelerator coherent light source (LCLS) at the Stanford Linear Accelerator Center (SLAC) provides sub-100 femtosecond pulses with approximately 1012 X-ray photons at wavelengths as short as 0.15 nm. These ultrafast fast X-ray pulses, coupled with high spatial and temporal coherence, enable research in new scientific fields ranging from 3-D imaging and important biomolecular dynamics studies to characterization of instantaneous state studies of matter.

In synchrotrons and free electron high power laser pointer (FELs), energy is transferred by a beam of electrons in a changing magnetic field. The electron travel path is affected by the array of polarities that transform the polarity, bending back and forth, resulting in the release of energy in the form of light. In the case of synchrotrons, the laser is spatially discontinuous. Typical pulses are 100 fs, but free electron lasers (FELs) emit a strong spatially coherent beam of light with pulse widths as short as tens of femtoseconds. In order to operate at a stable X-ray wavelength, the electron beams must be tightened so that they are coherent with the emitted light (effectively achieving stimulated emission).
Because the free electron laser FEL has no cavity and is a single pass device, a very bright laser beam is required to achieve gain saturation. Sometimes this is achieved by using a conventional ultrafast laser source (such as Nd: YLF or Ti: sapphire) to excite the photocathode in the accelerated radio frequency region, acting as an electron injector. Locked by the ultra-fast laser to get the master clock synchronization signal. The master clock is controlling the linear accelerator.
In addition, a number of synchrotrons around the world, using traditional ultrafast light sources, time-resolved beamlines have been developed to implement pump detection-studies. However, for each of these structures, a major drawback is that traditional solid-state ultrafast amplifiers typically consume huge optical platforms and require routine maintenance to ensure optimum performance.
Aaron Lindenberg, a Stanford professor at the Stanford Synchrotron Radiation Laboratory, used Calmar's Cazadero family of one-touch ultrafast fiber lasers to overcome this problem. Designed for use in OEM medical and microelectronics processing, the 2000mw laser pointer is compact, small, simple to set up, easy to install, and easy to adjust the beam. In addition, its high pulse energy (up to 20uJ <500fs) and high repetition frequency play the edge of the Stanford Synchrotron Radiation Laboratory. A good time-resolved time-resolved study is achieved.
In Lindenberg's preliminary experiment, an ultra-fast fiber laser operating at 1.28 MHz has been successfully phase-locked to a 476-MHz RF signal from a synchronous accelerator (Figure 1) with timing jitter less than 1 ps and is used directly Measure the X-ray pulse width. Figure 2 shows the direct measurement of the synchronization pulse in pulse X-ray mode. In the experiment, the 1030nm output light of the 50mw laser pointer is locked into the barium borate crystal by 500nm visible light generated by autocorrelation. The detected mixing signal is 340nm. Record the shortest pulse width ~ 3ps.

The optical synchronization and X-ray pulses ensure a special pump detection experiment. A high-energy pulse pumped or excited by the output of a fiber laser system induces a physical or photochemical conversion. Such a change is then detected at the atomic level by the X-ray pulse of the synchrotron. This dynamic process can be used to generate x-ray images of changes in atomic mass structure by the arrival times of different pulse detectors. This approach is being used to obtain a better understanding of the excited state dynamics of nanosystems, and also to distinguish them from their corresponding bulk structures.
In a recent study, Lindenberg's team used the 5mw laser pointer light source in a nanocrystal silver selenide system to successfully capture X-ray structural changes that occur during ultrafast times. While these preliminary studies are very encouraging, in order to further improve the signal-to-noise level, improved detector and sample delivery systems are now being developed. Future research is expected to deepen into the development of unique catalysts and more efficient photovoltaic materials.
At Lawrence Berkeley National Laboratory, Cazadero was also chosen to ensure the development of a light source called "next generation light source". In this case, the laser is again phase-locked, but is used to irradiate the cathode to produce an electron beam, which is accelerated to the high-energy RF cavity. This system has been developed as an electron injector for the next generation of light sources.
The next-generation light source is a free-electron laser that produces X-rays to the electron energy level of a thousand electrons and is the only work in the megahertz repetition rate. With the choice of cathode material, the laser will work in the basic wavelength of 1030nm, the second harmonic 515nm, or fourth harmonic 257.5nm. "Choosing a cathode burning laser pointer system is critical to the design of the machine used to support user equipment," said Howard Padmore, lead author of the Lawrence Berkeley Advanced Light Source Experimentation Group. "We can not tolerate any intervention on a daily basis, Cazadero is a provider Repeatable, stable operation, a simple on / off switch, and it provides all key specifications such as average power, repetition rate and pulse width for different types of cathodes and frequency locking.High-repetition-rate, high-brightness X-ray source for next-generation light sources, dynamic imaging, a wide variety of system configurations, and the development of new non-linear X-ray spectra.
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The First Photonic Neural Morphology Chip with Laser Power

The research team at Princeton University in the US has developed the world's first photonic neural morphology chip and demonstrated that it can be calculated at ultra-fast speeds, according to the MIT's Technical Review website. The chip is expected to open a new photon computing industry.
Princeton University Alexandre Tate team's new achievement is the use of photons to solve the neural network circuit speed limitation of this problem. Neural network circuit has been in the field of computing storm. Scientists hope to create more powerful neural network circuit, the key is to create a circuit that can work as neurons, or nerve morphology chip, but the main problem is to increase the speed of such circuits. Photon computation is the "star of tomorrow" in the field of computational science. Compared with electronics, photons have more bandwidth and can process more data quickly. However, photonics data processing systems have a high manufacturing cost and have not been widely adopted.

The core of the photon neural network, developed by the team, is an optical device in which each node has neuron-like response characteristics. These nodes are in the form of miniature circular waveguides etched into a silicon substrate in which light can circulate. When light is input, the output of the 100mw laser pointeroperating at the threshold is then adjusted, in which small changes in incident light can have a significant effect on the output of the laser.
The principle of this optical device is that each node in the system uses a certain wavelength of light, a technique known as wavelength division multiplexing. The light from each node is fed into the laser, and the 2000mw laser pointer output is fed back to the node, creating a feedback circuit with non-linear characteristics. The extent to which this nonlinear behavior simulates neural behavior has been shown to be mathematically equivalent to a device known as the "continuous-time recurrent neural network (CTRNN)", which suggests that CTRNN's programming tools can be applied to more Large silicon photon neural networks.
The Tate team used a 49-node silicon photon neural network to model the mathematical problem of a differential equation and compare it to an ordinary central processing unit. The results show that the speed of the photon neural network is improved by three orders of magnitude in this task. The researchers said that this will open a new photon computing industry. "Silicon photonic neural networks are likely to be the 'vanguard of a larger, scalable silicon-based photonic system," Tate said.