The traditional laser uses the thermal accumulation of laser energy to melt and even volatilize the material in the active area. In the process, a large number of chips, micro-cracks and other processing defects will be generated, and the longer the laser lasts, the greater the damage to the material. The ultra-short pulse laser has an ultra-short interaction time with the material, and the single-pulse energy is super strong enough to ionize any material, realize non-hot-melt cold processing, and obtain the ultra-fine, low-damage processing advantages incomparable with long-pulse laser. At the same time, for the selection of materials, ultrafast lasers have wider applicability, which can be applied to metals, TBC coatings, composite materials, etc.
Compared with traditional oxyacetylene, plasma and other cutting processes, laser cutting has the advantages of fast cutting speed, narrow slit, small heat affected zone, good verticality of slit edge, smooth cutting edge, and many kinds of materials that can be cut by laser. Laser cutting technology has been widely used in the fields of automobiles, machinery, electricity, hardware and electrical appliances.
According to the order of Russian Prime Minister Mikhail Mishustin, the Russian government will allocate 140 billion rubles over 10 years for the construction of the world's first new synchrotron laser accelerator SILA. The project requires the construction of three synchrotron radiation centers in Russia.
Since the invention of the world's first semiconductor laser in 1962, the semiconductor laser has undergone tremendous changes, greatly promoting the development of other science and technology, and is considered to be one of the greatest human inventions in the twentieth century. In the past ten years, semiconductor lasers have developed more rapidly and have become the fastest growing laser technology in the world. The application range of semiconductor lasers covers the entire field of optoelectronics and has become the core technology of today's optoelectronics science. Due to the advantages of small size, simple structure, low input energy, long life, easy modulation and low price, semiconductor lasers are widely used in the field of optoelectronics and have been highly valued by countries all over the world.
A femtosecond laser is an "ultrashort pulse light" generating device that emits light only for an ultrashort time of about one-gigasecond. Fei is the abbreviation of Femto, the prefix of the International System of Units, and 1 femtosecond = 1×10^-15 seconds. The so-called pulsed light emits light only for an instant. The light-emitting time of the flash of a camera is about 1 microsecond, so the ultra-short pulse light of femtosecond only emits light for about one billionth of its time. As we all know, the speed of light is 300,000 kilometers per second (7 and a half circles around the earth in 1 second) at an unparalleled speed, but in 1 femtosecond, even light only advances by 0.3 microns.
The team of Professor Rao Yunjiang of the Key Laboratory of Optical Fiber Sensing and Communications of the Ministry of Education, University of Electronic Science and Technology of China, based on the main oscillation power amplification technology, realized for the first time a multimode fiber random with an output power of >100 W and a speckle contrast lower than the human eye speckle perception threshold. Lasers, with the comprehensive advantages of low noise, high spectral density and high efficiency, are expected to be used as a new generation of high-power and low-coherence light sources for speckle-free imaging in scenes such as full field of view and high loss.
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