Since the birth of the first laser in the world in the 60's of the 20th century, researchers have studied and used the laser in many aspects. From 1963 to 1965, CO2 laser and YAG laser were developed successively. After the in-depth study on the characteristics of laser and the interaction mechanism between beam and matter, the application scope of laser skills began to be clear and specific.
Over the past 50 years, laser skills and their use have developed rapidly, and have been combined with many disciplines to form a number of application skills, such as laser processing skills, laser detection and measurement skills, laser chemistry, laser medicine, laser guidance, etc. These interpenetrating skills and new disciplines have greatly promoted the development of traditional and emerging industries, and given laser processing skills a wider range of use.
The structure of CO2 laser is from sealed off type, glass tube structure to transverse, longitudinal movable type and waveguide type;
In 1917, Einstein put forward on the basis of quantum theory: in the interaction between matter and radiation field, the atoms or molecules that make up matter can emit or absorb photons with the encouragement of photons. This shows that if the number of atoms (or molecules) of the material can be rotated according to the thermal equilibrium (Boltzmann) distribution of energy levels, it is possible to use stimulated emission to complete light amplification by stimulated emission of radiation (laser), which is the name of laser. Later, theoretical physicists discovered that stimulated emission photons (waves) and excited photons (waves) have the same frequency, direction, phase and polarization. All of these laid a theoretical foundation for the presentation of laser (a kind of optical wave oscillator). In 1960, his achievements were carried out at the first solid-state Ruby Laser Laboratory of the United States In 1961, de ruofen produced the first gas laser -- He Ne laser; in 1962, he produced semiconductor laser; in 1963, C. Patel produced the first CO2 laser; in 1965, Bell laboratory developed the first YAG laser; in 1962, he developed the first gas laser; in 1962, he developed the semiconductor laser;
With the development of the research on the interaction between laser beam and data, the progress of laser output power, stability and reliability makes it gradually used in practice, and has become an important branch of data processing in industrial production. Since the birth of the first laser, people began to explore the use of laser in the field of data processing. Before and after 1965, YGA laser and CO2 laser appeared one after another, because these two lasers can produce appropriate high output power and energy, it is possible to use laser in the field of data processing. In the early 70s of the 20th century, with the continuous improvement of crystal data quality, the improvement of concentrating cavity performance, the continuous improvement of cooling system and laser resonator structure, YAG laser began to become an important light source for cutting, welding and annealing of micro parts, and was gradually used in production. In the late 1970s, the structure of CO2 laser changed from sealed off, glass tube structure to transverse, longitudinal and waveguide type, and the encouraging methods changed from DC and AC.
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