| 释义 |
激光jīguāng某些物质原子中的粒子受光或电的激发,由低能级的原子跃迁为高能级原子,当高能级原子的数目大于低能级原子的数目,并由高能级跃迁回低能级时,就放射出相位、频率、方向等完全相同的光,这种光叫做激光。颜色很纯,能量高度集中,广泛应用在工业、军事、医学、探测、通讯等方面。{laser; acronym derived from the term ‘light amplification by stimulated emission of radiation’. Excited by light or electricity, the particles in an atom or molecule leap to higher energy levels; and when atoms at higher energy levels outnumber those at lower energy levels and return to a lower level, they give off radiation of a wholly coherent wavelength, frequency, direction, etc. Such a stimulated emission, marked for its purity of colour and high concentration of energy, is widely used in industry, war, medicine, surveying and telecommunications.}也叫also莱塞{láisè}。 |