Since the birth of the world's first in the 1960s, researchers have conducted various researches and applications on From 1963 to 1965, and were invented one after another. After in-depth study on the characteristics of and the interaction mechanism between , the application field of began to be defined and specified.
Over the past 50 years, and its application have developed rapidly and have been combined with many disciplines to form many application technology fields, such as laser processing technology, laser detection and measurement technology, laser chemistry, laser medical treatment, laser guidance, etc. The emergence of these cross-cutting technologies and new disciplines has greatly promoted the development of traditional industries and emerging industries, while giving laser processing technology a wider range of applications.
The structure of has developed from sealed-off type and glass tube structure to transverse, longitudinal flow type and waveguide type.
In 1917, Einstein proposed on the basis of quantum theory that in the interaction between matter and radiation field, the atoms or molecules that make up the tribute can generate stimulated emission or absorption of photons under the excitation of photons. This indicates that if the number of atoms ( or molecules ) of the constituent substances can be reversed according to the Boltzmann distribution of energy levels, it is possible to realize light amplification by stimulated emission, which is the name of laser. Later, theoretical physicists discovered that stimulated emission photons ( waves ) and stimulated photons ( waves ) have the same frequency, direction, phase and polarization. All these have laid a theoretical foundation for the emergence of laser ( a kind of light wave oscillator ). By 1960, Theodore H.Maiman of Hughes laboratory invented the world's first ruby laser)； based on the development of quantum electronics. In 1961, Drovan invented the first gas laser, the He - Ne laser. In 1962, semiconductor lasers appeared again. In 1963, C．Patel invented the first co2 laser. In 1965, Bell Laboratories invented the first
The development of high-power began in 1968. In 1971, the first commercial lkW Co2 laser appeared. In 1980, 200W excimer Kr laser was published. In 1988, a frequency doubling pumped YAG laser appeared. Since then, the development of lasers has been very rapid, with various practical solid, gas, semiconductor, dye and excimer lasers appearing and improving continuously.
With the development of the research on the interaction betweenand materials, the improvement of the , stability and reliability of laser has gradually been applied in practice and has become an important branch of material processing in industrial production. Since the birth of the first laser, people have begun to explore the application of laser in the field of material processing. Around 1965, YGA laser and Co2 laser appeared one after the other. Because these two lasers can produce relatively high output power and energy, the application of laser in the field of material processing became possible. In the early 1970s, with the continuous improvement of crystal material quality, the improvement of condenser cavity performance, and the continuous improvement of cooling system and laser resonant cavity structure, began to become an important light source for cutting, welding, annealing and other micro-parts and was gradually applied in production. By the late 1970s, the structure ofhad developed from sealed-off type and structure to transverse, longitudinal flow type and waveguide type. At the same time, the incentive mode has been changed from DC to AC.