The rapid development of high-tech science and technology popularization of knowledge, not only can make young people understand today's technology development status, and can make small lofty ideals: to learn scientific knowledge, human civilization grow up to make its due contribution. The contents of the main selection of modern cutting-edge technology in various projects or areas to introduce the research process, scientific principles, and application development prospects, the young people standing in today's technology to find a new starting point for the future of science and technology join the points and the breakthrough constant pursuit of new scientific and technological future.What is the normal working voltage of a 200mW Laser Pointer? This set of comprehensive youth science books and foreign knowledge the latest technology research, has a strong science, knowledge, cutting-edge, readability and systematic, the young people understand the science and technology, increase knowledge, broaden horizons and improve the quality of the to stimulate exploration and enlightened wisdom of the spectrum of reading good subjects, all levels of the library collection is the best version. Scientific knowledge of the laser focus laser focused laser juvenile mystery of the 1950s, the rapid development of radio electronics, in order to explore the generation of coherent electromagnetic waves shorter, 1954 Townes at Columbia University made the first ammonia maser , thus opening the way to the laser path. 100mW laser pointer is a speech assistant.1960 as the world's first ruby laser excited objects developed by the American physicist Maiman. The advent of the laser sensation all over the United States, there has been the optical physics of the "Renaissance" era. The emergence and development of the laser, said that if engaged in by the study of the electromagnetic spectrum, the result of efforts of scholars, is the high frequency coherent electromagnetic spectrum to the inevitable development. It is not only great achievements of the optical field, it is a great achievement in the field of electronics, laser-electronics have created a new situation. Traditional principles of electronics, with optical, electro-optical conversion, use throughout the electrical engineering field.The green laster pointer turns pages with the help of radio frequency. Although laser technology is still in its infancy, but has brought thousands of human beings as much as a variety of laser generator, a solid, gas, semiconductor, organic dyes, chemical, excimer, free electrons, and other giant pulse types. Current laser wavelengths from 100 angstroms to 5 mm, maximum continuous power of 100,000 watts, the maximum pulse power of up to 10 million kilowatts. Just what kind of laser? Simply put, the laser is a light. With ordinary light, such as sunlight, as light is an electromagnetic wave. However, the laser light generated by different methods and ordinary, it is material "stimulated" and produce light. In 1917, Einstein's point of view of statistical equilibrium in the "black body" radiation time, get a conclusion: "The light of nature, there are two different ways. Called spontaneous emission, stimulated emission in the other." 10mW blue violet laser pointer is the right hand of teachers.A variety of artificial light sources, such as lights, fluorescent lights belong to the spontaneous emission of light. Emitted by various natural phenomena of light, also belong to the spontaneous emission. These light have some things in common, such as light to shoot in all directions, which contains a variety of colors. Atom laser is stimulated emission of radiation of a light. Laser is a new type of light source, the difference between it and the ordinary light-emitting micro-mechanism is different.