The laser pointer burns the paper

When it comes to technological marvels, laser pointers are often overlooked. Often used for presentations or classroom lectures, these small handheld devices have a surprising feature that many people don't know about – they can burn paper. The purpose of this article is to explore the scientific principles behind the phenomenon of laser pointer burning paper and its practical implications, as well as to provide an expert perspective on the topic.

Qiu Min's research group at the Future Industry Research Center of Westlake University and the School of Engineering has successfully developed a new silicon carbide photonic device, which can effectively reduce the thermal drift problem in high-power laser processing. The team used semiconductor technology to fabricate large-aperture, high-precision 4H-SiC metalenses, which benchmarked high-performance commercial objective lenses and achieved diffraction-limited focusing. After a long period of high-power laser irradiation, the device performance remains stable and is almost unaffected by heat absorption. This achievement represents a major breakthrough in high-power laser systems, opening up new horizons for their application and efficiency improvement. The research results were published in the international journal Advanced Materials under the title of "4H-SiC Metalens: Mitigating Thermal Drift Effect in High-Power Laser Irradiation".

Thermal management is one of the important factors to ensure the stability of semiconductor lasers. In this paper, the heat transfer process of semiconductor lasers is analyzed, and the heat dissipation methods of high-power semiconductor lasers are summarized, hoping to provide some help to researchers engaged in high-power semiconductor lasers in the future.

We will delve into the teardown of the 5mW green laser pointer. Laser pointers have become ubiquitous in our modern world, serving a variety of uses from presentations to astronomy. But have you ever wondered about the internal mechanism by which these devices emit focused beams? Let's explore the teardown process and uncover the secrets hidden within.

For those who need to go on stage for a wonderful PPT explanation or teaching, in order to let the audience clearly grasp the progress position of what the narrator said, the guidance of the laser pointer is indispensable. However, there are not only a variety of styles that compound the functions of the briefing machine and mouse in the laser pointer products, but also common red light and professional-grade green light and blue light in terms of light color, so it must not be easy to buy. In this article, I will share how to buy a laser pointer.

The introduction of high-wattage 365 nm laser pointers has had a significant impact on various industries, from UV curing to forensic analysis, fluorescence research to entertainment. The power and precision of these lasers are revolutionizing existing practices and opening up new avenues for research and creativity. However, it is important to recognize the potential risks associated with UV wavelengths and prioritize the safety of their use. With the advancement of technology, the applications and advantages of 365nm high wattage laser pointers are bound to continue to expand, propelling us towards a brighter future.

The 301 500MW green high power laser pointer provides a powerful and versatile tool for a wide range of applications. Its high output power and superior range make it ideal for educators, astronomers, outdoor enthusiasts, and professionals. However, this laser pointer must be handled responsibly and the necessary safety precautions must be followed to prevent accidents and protect your own well-being and the well-being of others.

GaAs-based 980nm semiconductor lasers have important applications in materials processing, communications, and medical fields. The emergence of strain-variable subwell structures improves the conversion efficiency, output power and reliability of GaAs-based semiconductor lasers. In this paper, the historical development of high-power GaAs-based quantum well lasers is reviewed, the epitaxial structure, chip structure and packaging structure design of high-power semiconductor lasers are introduced, and the problems affecting the optoelectronic performance, heat dissipation and practical application of high-power GaAs-based quantum well lasers are emphatically expounded. In view of the above problems, the corresponding solutions and research results are discussed, and the shortcomings and improvement directions of each scheme are pointed out. Finally, the development status of high-power semiconductor lasers is summarized, and the development direction of high-power semiconductor lasers is prospected.

Laser pointer, also known as laser pointer, pointer, etc., is a pen-shaped emitter designed to be portable, easy to hold in the hand, and processed into a laser module (diode). Common laser pointers include red (650-660nm), green (532nm), blue (445-450nm), and blue-violet (405nm). It is usually used by newspapers, teachers, and docents to project a point of light or a ray of light directed at an object.

Beam synthesis is an effective technical solution to break through the power output limit of single-fiber laser and obtain higher power laser output. In recent years, breakthroughs have been made in various types of beam synthesis, such as power synthesis, spectral synthesis, and coherent synthesis, and the output power has been increased by an order of magnitude compared with the highest power value of a single fiber. Composite applications with multiple beam synthesis types are expected to further increase laser power, compress laser pulse duration, and achieve higher performance laser systems. Therefore, the latest research progress of high-power fiber laser beam synthesis is analyzed, the research trends are refined, the research characteristics are summarized, and the challenges and key technologies faced by the research and development of more types of beam synthesis systems in the future are analyzed and prospected.

The development history of high-power solid-state laser technology is a history of struggle with "waste heat", in order to suppress the adverse effects of thermal effect on beam quality, heat capacity lasers, thin slice lasers, slat lasers and fiber lasers have appeared successively, and the new gain medium form combined with advanced heat dissipation technology will increase the laser output power to the order of 100 kilowatts. The thermal performance of the solid-state laser gain medium is an important bottleneck that limits the further breakthrough of laser power. Therefore, it is of great significance to find laser crystal materials with ultra-high thermal conductivity. In this paper, the basic principles of the above four lasers and their research progress in high-power lasers are introduced
From the perspective of improving the thermal conductivity of gain dielectric materials, the existing methods and research results are analyzed and summarized, and the research on superthermal conductivity laser crystals and the development of high-power laser technology are prospected.

The laser pointer can damage the camera sensor, and its effects are related to the laser intensity and the duration of the irradiation. A normal laser pointer will not cause much damage if exposed to it for a short period of time, but a high-power laser pointer may damage the camera. The design and material of the camera affect its ability to resist lasers. Avoid illuminating the camera when using the laser pointer, and take precautions to reduce the risk of damage.

Beam quality factor is the main parameter to characterize the transverse pattern of high-power lasers, and in order to solve the problem that the current beam quality analyzer can only be used for beam quality evaluation of small-aperture and low-power lasers, the principle and simulation of attenuation and beam reduction technology for beam quality measurement of high-power lasers were studied. The simulation model of the attenuation and shrinking beam component is established, and the thermally induced aberrations of optical components under high-power laser are studied by using the finite element method, and it is concluded that when the peak-to-trough (PV) value of thermally induced aberrations is less than 82 nm, the influence on the beam quality factor is less than 5%. As the beam passes through the attenuation component, if debias occurs, the beam quality factor will be smaller. Based on the Zenic polynomial and the beam quality factor calculation model, the influence of the wavefront distortion of the beam shrinking component on the measurement is studied and analyzed, and it is seen through the Zemax simulation analysis that the influence on the beam quality factor measurement is less than 5% when the angle of view between the incident light and the center optical axis of the beam shrinking component is less than 7° during the assembly and adjustment.

The problem of heat dissipation with high heat flux density has become one of the key technologies for the development of high-power lasers. Based on our research work in recent years, this paper reviews the current research status of high-power laser cooling technologies that are currently being applied or studied, mainly including microchannel liquid convective heat transfer, solid cooling, spray cooling and micro heat pipe cooling. Then, according to the development trend of technology, microchannel boiling heat exchange cooling and liquid nitrogen cooling are two cooling technologies with good application prospects, and the current basic research progress of these two technologies is introduced.

A new multi-cavity structure is used to optimize the light field distribution of the vertical cavity surface-emitting laser (VCSEL), which solves the problems of low output power and poor beam quality caused by the severe carrier aggregation effect of large aperture devices. The results show that the new structure VCSEL has a lower threshold current than the traditional structure devices with the same aperture structure, especially the output power is increased by nearly 56% compared with the traditional structure, and the far field shows a Gaussian distribution. The research work provides a new technical approach for the realization of high-beam quality and high-power vertical cavity surface-emitting lasers.

The achievements of the research and development of high-power solid-state laser devices over the past decades and the traction of future needs, a generation of high-power solid-state laser technology has become history; The second-generation high-power laser technology is thriving and has become the mainstream technology approach; Three generations of high-power laser technology have emerged and shown strong vitality.

Key words lasers; high-power narrow-linewidth continuous-wave fiber laser; spectral broadening; phase modulation; stimulated Brillouin scattering effect

The purpose of the invention is to overcome the limitations of the above-mentioned existing inhibition of the thermal effect of high-power lasers, and to provide a compensation method for the thermal lensing effect of high-power lasers, which can effectively suppress the thermal lensing effect of high-power lasers, which is not only simple to operate, scientific and effective, but also has strong practicability.

Laser is another major invention of mankind since the 20th century, after atomic energy, electronic computers, and semiconductors. Semiconductor laser science and technology takes semiconductor laser devices as the core, covering the study of the law, generation method, device technology, control means and application technology of stimulated radiation amplification of light, and the required knowledge integrates geometric optics, physical optics, semiconductor electronics, thermodynamics and other disciplines.

After more than 50 years of development, semiconductor laser, as a world-class research direction, has developed by leaps and bounds along with international scientific and technological progress, and has also benefited from breakthroughs in various related technologies, materials and processes. The progress of semiconductor laser has received great attention and attention in the international scope, not only in the field of basic science and continuous research and deepening, the level of science and technology continues to improve, but also in the field of application continues to expand and innovate, the application of technology and equipment emerge in an endless stream, the application level has also been greatly improved, in the national economic development of all countries in the world, especially in the fields of information, industry, medical and national defense has been an important application.

At present, the development of semiconductor lasers in the world is in a new stage of rapid development, and China's laser science and technology has basically maintained a trend of synchronous development with the world. From the perspective of comprehensive social development, industrial economic upgrading, national defense and security application and economic structure transformation, from the perspective of national competitive development, more clear needs are put forward for the comprehensive innovation of semiconductor laser technology and the transformation and development of industrial applications. In this paper, the development history and current situation of semiconductor lasers are reviewed, and the achievements of Changchun Institute of Optics, Fine Mechanics and Physics in recent years in high-power semiconductor lasers, especially in high-power semiconductor laser laser light sources, vertical cavity surface-emitting lasers and new laser chips.