Laser Machine World for Laser Technology and Laser Products

Since laser intensity noise often sets the performance limits of experiments, it is important to characterize it for good results. Low noise, high sensitivity photoreceivers are invaluable when making such measurements. Optical receivers provide an ideal solution for this application. They combine scatter-grain noise-limited performance, high conversion gain, and wide bandwidth to make noise measurements easy to perform.   Figure 1 shows a typical setup for measuring laser intensity noise. The laser output is attenuated to unsaturate the photodetector and focus it onto the photoreceiver. It is important to ensure that the photodetector is not overfilled. This can lead to undesired noise coupling as mechanical vibrations cause the photodetector to see varying amounts of laser light. These acoustic frequencies will give false peaks in the amplitude noise spectrum.   The output of the photodetector is then sent to the spectrum analyzer. It is very common for the equivalent input ...

Power and energy density are two important concepts to understand when dealing with laser optics. These two terms are often used interchangeably but have different meanings   In most scientific disciplines, including chemical and electrical engineering, "power density" and "energy density" usually describe three-dimensional volumes. However, in the optical sciences, these terms are usually used to describe two-dimensional regions unless they are described as "volumes". Power density, energy density, fluence, and irradiance are often used interchangeably in the optical industry, which can be completely inaccurate, especially when it is not clear whether the metric is a 2D or 3D value. This is particularly important for laser cutting and welding applications, where the depth of laser penetration must be considered, rather than simply touching a surface. Volume values are often more applicable in these situations and are an important distinction that must be...

  Lasers have been hailed as one of the great inventions of the twentieth century, following nuclear power, computers, and semiconductors, and have brought about a great technological breakthrough for mankind. The laser radiation produced by lasers is famous for being the "fastest blade", the "most accurate ruler" and the "brightest light". Nowadays, laser technology plays an important role in many fields such as medicine, the military industry, communications, and so on.   The birth of the laser is the result of the tireless efforts and arduous exploration of many scientists.   In 1917, Albert Einstein proposed the concept of "stimulated radiation", which laid the cornerstone for the theoretical foundation of lasers.   Although the theory of lasers had already been proposed at that time, the actual preparation of lasers was quite challenging. By the 1950s, with the progress of photon and microwave technology, the manufacture of an oscillator cap...

With the development of industrial manufacturing in the direction of high-end, intelligent, green, new energy vehicles, lithium batteries, semiconductors, and emerging markets demand-driven, the demand for laser welding has been continuously stimulated, the scope of application and the market continues to expand. Especially in the fields of consumer electronics, new energy vehicles, and other fields, the requirements for laser welding are becoming more and more high, providing a huge market space for laser welding. However, any processing method without a good grasp of its principles and processes will produce certain defects or defective products, laser welding is no exception. Only a good understanding of these defects, and learning how to avoid producing these defects, in order to better utilize the value of laser welding, processing the appearance of fine, high-quality products. MAX  welding application engineers through the accumulation of long-term experience, summed up some ...

  Recently, Laser Photonics , a leader in the field of laser cleaning systems in the United States, announced that it has successfully received an order from Mine System Solutions (MSS), a well-known mining equipment service provider, covering CleanTech 3000-CTHD laser cleaning system and MarkStar Pro laser marking and engraving. system.   Wayne Tupuola, CEO of Laser Photonics, said: “We are honored to be MSS’s preferred laser technology supplier. Our CleanTech and MarkStar technologies are widely used in the mining industry for their high quality, accuracy, and cost-effectiveness. It provides a safe and environmentally friendly solution for the repair, upgrade, and process improvement of mining equipment.”   MSS, headquartered in Boonville, Indiana, specializes in providing a full range of repair, upgrade, and remanufacturing services for mining equipment. MSS is committed to providing the mining industry with more cost-effective solutions while ensuring safety and qual...

  The principle of laser rust removal is laser cleaning   The process of pulsed Nd: YAG laser cleaning depends on the characteristics of the light pulses generated by the laser and is based on a photophysical reaction caused by the interaction between the high-intensity light beam, the short-pulsed laser light, and the contaminated layer. The physical principle can be summarized as follows:   a) The beam emitted by the laser is absorbed by the contaminated layer on the surface to be treated. b) The absorption of the large energy creates a rapidly expanding plasma (highly ionized unstable gas), which generates a shock wave. c) The shock wave causes the contaminants to fragment and be removed. d) The width of the light pulse must be short enough to avoid the heat buildup that destroys the treated surface. e) Experiments have shown that plasma is generated on metal surfaces when oxides are present on the surface.   Plasma is only generated at energy densities above a t...

The battery module is the heart of an electric vehicle. Electric vehicles are powered by batteries, so the reliability of the battery is critical to the safety of the vehicle. Having launched its first all-electric vehicle, the i3, back in 2013, the BMW Motor Group is well aware of the multiple challenges of battery production. As production capacity continues to increase, so does the complexity of battery production - for example, as many as 144 welds are required in the production of BMW's fifth-generation battery modules.   With the Ophir BeamWatch Integrated automated laser beam measurement system, automakers can inspect the laser beam before welding each new battery module without disrupting the production cycle. Prior to Ophir BeamWatch Integrated, the automaker had to perform weekly spot checks with micrographs in order to confirm the ideal weld depth. Beam quality monitoring without compromising production cycles Laser welding in battery production requires absolute precisi...