Before the advent of the laser, optical mainly restricted to linear optics, namely the spread of the beam in space or in the media are independent of each other, several beam through the beam cross-region continue to spread independent without interference by the other beam. Since the inception of laser, nonlinear optics has been a rapid development, has become a fairly mature discipline branch. Nonlinear optics, including nonlinear optical phenomena, nonlinear optics, nonlinear optics theory, nonlinear optical materials. Nonlinear optical theory is accompanied by nonlinear optical phenomena and gradually developed, and is now becoming more and more perfect. green laser pointer has many more special and novel functions.
Nonlinear optical materials occupy a prominent position in the field of nonlinear optics, especially the new, highly efficient, high-quality nonlinear materials for the development of nonlinear optical devices provide a broad platform. The new laser technology, the continuous development of tunable lasers and perfect, provides a powerful tool for nonlinear optical studies, made it possible to study the high-end and resonance-enhanced nonlinear optical effects. At present, the nonlinear optical frequency conversion technology is widely used in the expansion of coherent radiation band has opened up broad prospects for the laser industry. After decades of extensive and in-depth research, nonlinear optics has achieved fruitful results, one of the optical disciplines most active and most important subdiscipline. laser pointer has the special appearance such as the gun shape, bottle shape and so on.
The invention of the laser laser is a major achievement of 20th century science and technology. It makes people finally have the ability to drive a very small scale, a great number of very chaotic movement of the molecules and atoms of light-emitting process, resulting in the generation, amplification of coherent infrared, visible light and ultraviolet light (as well as X-ray and γ-rays). Laser solid-state lasers, gas lasers, semiconductor lasers, excimer lasers and free electron lasers. It can be said that the laser is a wide variety of different performance, however, the vast majority of the laser output frequency is fixed or in a small range of changes. The laser output frequency and tuning range is limited, especially in some frequency laser is also difficult to be generated by an ordinary method. green laser has the special laser head with amazing picture formed and adjusted.
Still needed in some practical applications of optical frequency conversion technology to various wavelengths of coherent radiation sources. The rise of laser science and technology awareness and use of human light reached a new level. The history of the birth of the laser can be divided into several stages, in 1916 Einstein proposed stimulated emission concept is an important theoretical basis. This theory suggests that the material particles in high-energy state by an energy equal to the two energy levels the energy difference between the photon will be converted to a lower state, and to produce a second photon with a photon is emitted, which is affected by stimulated emission of radiation. This radiation output light amplification, and coherent light, such as multiple photon emission direction, frequency, phase, polarization, exactly the same. The special appearance of green laser pointer can help the manufacturer attract more customers.
Since then, the establishment and development of the quantum mechanics of material microstructure and the law of motion have a better understanding of the micro-particle energy distribution, transition and photon radiation has also been more eloquent testimony to this is also an objective on a more complete Einstein’s theory of stimulated emission, and further laid the theoretical foundation for the generation of lasers. The late 1940s, after the birth of quantum electronics, was soon applied to study the interaction of electromagnetic radiation with a variety of micro-particle system, and developed many of the devices. The rapid development of scientific theory and technology to create the conditions for the invention of the laser. 1951, American physicist, Purcell and Pound successfully in the experiments resulted in the inversion, and 50 kHz per second by the Stimulated Emission of Radiation. The different special appearance of green laser pointer can attract different kinds of customers.