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激光是六十年代发展起来的一项新技术。它是由激光器里的特定物质受激后发射出的高强度光束。这种光具有方向性强、亮度高、单色性和相干性极好的特点。激光器也能发射紫外线、可见光、红外线等不同波长的光。六十年代以来,世界各国开始将激光技术应用于工农业生产、医药卫生、军事和
Laser is a new technology developed in the sixties. It is a high-intensity light beam emitted by a specific substance in the laser. This kind of light has the characteristics of strong directivity, high brightness, monochromaticity and coherence. The lasers can also emit light of different wavelengths, such as ultraviolet light, visible light, and infrared light. Since the 1960s, various countries in the world started to apply laser technology to industrial and agricultural production, medical and health, military and