The United States developed a phonon laser Since its invention in 1960, optical lasers have developed into a $10 billion global technology market, and scientists such as Art Ashkin, Gerard Mourou and Donna Strickland have won Nobel Prizes. Now, researchers from the Rochester Institute of Technology in the United States have collaborated with experts from the University of Rochester to use the optical tweezers technology invented by Ashkin to create a different type of laser: sonic laser. Optical tweezers Optical tweezers are a device that uses a highly focused laser beam to generate force (usually on the order of piconewtons) to move tiny transparent objects. Because the force of optical tweezers can directly act on cells and even smaller targets with precision, their applications in science have become more and more extensive. For example, it can be used to move cells or virus particles, pinch cells into various shapes, or cool atoms. In the latest issue of the journal Nature Photonics, researchers proposed and demonstrated a phonon laser that uses optically suspended nanoparticles. Phonons are energy quantum related to sound waves, and optical tweezers are used to test the limits of quantum effects in isolation and eliminate physical interference from the surrounding environment. The researchers studied the mechanical vibration of nanoparticles, which are suspended under gravity by the radiant force at the focal point of an optical laser beam. Mishkat Bhattacharya, associate professor of physics and researcher of theoretical quantum optics at Rochester Institute of Technology, said: "The position of the nanoparticles is measured by detecting the light scattered by the nanoparticles, and this information is fed back to the tweezers beam, which allows us to produce a laser-like situation. The vibration becomes strong and fully synchronized, just like electromagnetic waves produced by optical lasers." Because the waves emitted from the laser pointer are synchronized, the light beam can travel long distances without propagating in all directions, unlike the light from the sun or light bulbs. In standard optical lasers, the characteristics of the light output are controlled by the material from which the laser is made. Interestingly, in phonon lasers, the effects of light and matter are opposite, and the movement of matter particles is now controlled by optical feedback. Bhattacharya said: "We are very pleased to see such devices with so many and still evolving applications, especially for sensing and information processing." He also said that the phonon laser is expected to realize the research of basic quantum physics, including the engineering of the famous Schrödinger’s cat thought experiment that can exist in two places at the same time. Bhattacharya's research team received personal funding from the Office of Naval Research and a comprehensive award led by the University of Rochester.

Romanian scientists have developed a record-breaking 10-megawatt laser, which is equivalent to one-tenth of the energy produced by the sun on the earth. In addition to letting someone or something evaporate, it is mainly used for research purposes. Scientists from three countries will use this super-intensity laser to study the characteristics of photonuclear, cancer medicine, radiation research, and so on. In 2014, the Extremetech website once described a 1 MW laser as a "death star", and now the laser developed is ten times stronger. The laser was developed by the European Commission through the "ultra-light infrastructure" (ELI) project to provide 850 million euros in funding. The project includes facilities in Romania, Hungary and the Czech Republic. Romanian laboratories use it to study photonuclear physics. The Hungarian facility used attosecond (1x10-18 seconds) laser pulses for experiments. The Czech Republic team studies short-pulse secondary radiation sources and particles. The ELI project plans to build a fourth laser laboratory. The laser intensity of the laboratory is an order of magnitude higher, but a site has not yet been selected for it. The appearance of a 10 MW laser may not be what most people think. It is located in a sealed chamber, moved through several vacuum tubes with focusing lenses, and researchers can't even see it. Instead, they read relevant data from the computer. Researchers can use this laser to study the effects of supernovae and how heavy metals are formed. As for practical applications, it may help proton therapy for cancer. It may also help to find ways to dispose of radioactive waste

Laser cutting is a very important equipment in industrial construction. It is widely used in automobiles, ships and other fields. With more and more metal products, the precision requirements of laser cutting are getting higher and higher, but due to the late start and weak foundation , There are many short boards in laser cutting in my country, and this field has always been monopolized by Europe and the United States. Western companies have always been rude to China. A piece of equipment costs hundreds of thousands or even millions. Once it breaks down, we need to hire foreign experts to repair it at a high price. However, today when laser cutting equipment has become popular, the price of cutters has been reduced to several hundred thousand yuan, and low-power cutting machines are even lower than 2,000 yuan. The reason why the pricing power can be regained from foreign hands is mainly due to the rise of domestic laser giants. The rise of domestic enterprises Pentium Laser, Bond Laser, and Huagong Technology are all major forces in our country. For example, Huagong Technology is the first high-tech company in central China to be reorganized and listed by the university industry, and it is also the national 863 high-tech achievement industrialization base. Founded in 1999, this company has experienced 22 years of hard work and has become the world's leading manufacturer of laser cutting equipment. In March 2021, Huagong Technology launched the world's first new product of 30,000 watt ultra-high power laser cutting equipment, with a cutting accuracy of up to ±0.1mm, which indicates that my country's laser cutting equipment equipped with independent light sources has reached the world's leading level. The rise of state-owned enterprises is mainly based on two aspects: emphasis on talents and internationalization strategy, which makes them more and more outstanding. These two strategies are also the principles followed by most Chinese enterprises. Adhering to these two concepts, Chinese companies will definitely be more dazzling in the future.

In the air, the maximum sound cannot exceed about 194 decibels, while in water it is about 270 decibels. A few days ago, a team led by Gabriel Blaj, a scientist at the SLAC National Accelerator Laboratory and Stanford University, created the largest underwater sound to date. The researchers used SLAC's Linac Coherent Light Source (LCLS) X-ray laser to bombard microjets of water (between 14 and 30 microns in diameter), creating an incredible sound pressure of over 270 decibels. When a short X-ray pulse hits water, it evaporates and produces shock waves. This shock wave then passes through the ejector and forms a copy of itself in a "shock wave train" consisting of alternating areas of high and low pressure. In other words, a very loud underwater sound. The team found that once the intensity of the sound exceeds a certain threshold, the water will burst and turn into small bubbles, which will immediately collapse in a process called cavitation. Because the pressure in the sound waves generated by X-rays is just below the separation threshold, the underwater sound at this time will become the loudest. The research results have been published on Physical Review Fluids.

The United States developed a phonon laser Since its invention in 1960, optical lasers have developed into a $10 billion global technology market, and scientists such as Art Ashkin, Gerard Mourou and Donna Strickland have won Nobel Prizes. Now, researchers from the Rochester Institute of Technology in the United States have collaborated with experts from the University of Rochester to use the optical tweezers technology invented by Ashkin to create a different type of laser: sonic laser. Optical tweezers Optical tweezers are a device that uses a highly focused laser beam to generate force (usually on the order of piconewtons) to move tiny transparent objects. Because the force of optical tweezers can directly act on cells and even smaller targets with precision, their applications in science have become more and more extensive. For example, it can be used to move cells or virus particles, pinch cells into various shapes, or cool atoms. In the latest issue of the journal Nature Photonics, researchers proposed and demonstrated a phonon laser that uses optically suspended nanoparticles. Phonons are energy quantum related to sound waves, and optical tweezers are used to test the limits of quantum effects in isolation and eliminate physical interference from the surrounding environment. The researchers studied the mechanical vibration of nanoparticles, which are suspended under gravity by the radiant force at the focal point of an optical laser beam. Mishkat Bhattacharya, associate professor of physics and researcher of theoretical quantum optics at Rochester Institute of Technology, said: "The position of the nanoparticles is measured by detecting the light scattered by the nanoparticles, and this information is fed back to the tweezers beam, which allows us to produce a laser-like situation. The vibration becomes strong and fully synchronized, just like electromagnetic waves produced by optical lasers." Because the waves emitted from the laser pointer are synchronized, the light beam can travel long distances without propagating in all directions, unlike the light from the sun or light bulbs. In standard optical lasers, the characteristics of the light output are controlled by the material from which the laser is made. Interestingly, in phonon lasers, the effects of light and matter are opposite, and the movement of matter particles is now controlled by optical feedback. Bhattacharya said: "We are very pleased to see such devices with so many and still evolving applications, especially for sensing and information processing." He also said that the phonon laser is expected to realize the research of basic quantum physics, including the engineering of the famous Schrödinger’s cat thought experiment that can exist in two places at the same time. Bhattacharya's research team received personal funding from the Office of Naval Research and a comprehensive award led by the University of Rochester.

Romanian scientists have developed a record-breaking 10-megawatt laser, which is equivalent to one-tenth of the energy produced by the sun on the earth. In addition to letting someone or something evaporate, it is mainly used for research purposes. Scientists from three countries will use this super-intensity laser to study the characteristics of photonuclear, cancer medicine, radiation research, and so on. In 2014, the Extremetech website once described a 1 MW laser as a "death star", and now the laser developed is ten times stronger. The laser was developed by the European Commission through the "ultra-light infrastructure" (ELI) project to provide 850 million euros in funding. The project includes facilities in Romania, Hungary and the Czech Republic. Romanian laboratories use it to study photonuclear physics. The Hungarian facility used attosecond (1x10-18 seconds) laser pulses for experiments. The Czech Republic team studies short-pulse secondary radiation sources and particles. The ELI project plans to build a fourth laser laboratory. The laser intensity of the laboratory is an order of magnitude higher, but a site has not yet been selected for it. The appearance of a 10 MW laser may not be what most people think. It is located in a sealed chamber, moved through several vacuum tubes with focusing lenses, and researchers can't even see it. Instead, they read relevant data from the computer. Researchers can use this laser to study the effects of supernovae and how heavy metals are formed. As for practical applications, it may help proton therapy for cancer. It may also help to find ways to dispose of radioactive waste