Characteristics and applications of laser

From the concept of stimulated emission, the properties of lasers and ordinary light sources are quite different, and this is because the laser is known as a magical light. (1) Good directivity u0026mdash;u0026mdash; Ordinary light sources (the sun, incandescent lamps or fluorescent lamps) emit light in all directions, and the light emitting direction of the laser can be limited to less than a few milliradian solid angles, which makes the illumination in the direction of illumination Increase ten million times. Laser collimation, guidance and ranging are the use of this feature of good directivity.　　(2) High brightness u0026mdash;u0026mdash;Laser is a very bright light source in modern times. Only the strong flash of the hydrogen bomb can compare with it. The brightness of the sun is about 103 watts/(cm2. steradian), and the output brightness of a high-power laser is 7 to 14 orders of magnitude higher than that of the sun. In this way, although the total energy of the laser is not necessarily large, due to the high concentration of energy, it is easy to generate high pressure and tens of thousands of degrees Celsius or even millions of degrees Celsius at a tiny point. Laser drilling, cutting, welding, and laser surgery take advantage of this feature.　　(3) Good monochromaticity u0026mdash;u0026mdash;Light is an electromagnetic wave. The color of light depends on its wavelength. The light emitted by ordinary light sources usually contains various wavelengths and is a mixture of light of various colors. Sunlight includes visible light in seven colors of red, yellow, green, cyan, blue, and purple, as well as invisible light such as infrared light and ultraviolet light. The wavelength of a certain laser is only concentrated in a very narrow spectral band or frequency range. For example, the wavelength of a HeNe laser is 632.8 nanometers, and its wavelength range is less than one ten-thousandth of a nanometer. Due to the good monochromaticity of the laser, it provides an extremely advantageous means for precision instruments to measure and stimulate certain chemical reactions and other scientific experiments. (4) Good coherence u0026mdash;u0026mdash;Interference is an attribute of wave phenomenon. Based on the characteristics of high directivity and high monochromaticity of laser, it must have excellent coherence.　　3) The application of laser　　The inherent characteristics of laser make it very optimistic about its application prospects when it was born, and people have studied and tested its application potential from different aspects. The industry intends to develop it into a multi-functional processing tool. The information industry is looking forward to developing it into a new type of sensor and communication method. The medical community is looking forward to using it to diagnose and treat difficult diseases. The military is trying to develop dead-light weapons. The scientific community is counting on it. Known as the right-hand man in exploring the natural world, the energy industry intends to develop laser-driven nuclear fusion energy. Looking at the development of laser applications, it can be said that it is changing with each passing day and emerging in endlessly, and has made brilliant achievements in the fields of industry, information, medicine, and energy. Laser acupuncture, laser cutting, laser cutting, laser welding, laser hardening, laser disc, laser rangefinder, laser gyroscope, laser plumbometer, laser scalpel, laser bomb, laser radar, laser gun, laser cannonu0026hellip;u0026hellip ; Laser has penetrated all aspects of people's lives. (See www.gnlaser.com for the editing and finishing details of the metal laser cutting machine above)