激光是于60年代发展起来的一门科学技术。在国际上通称“LASER”(莱塞),该名词是从LIGHT AMPLICATION STIMULETED EMISSION OF RADIATION的各个名词的字头合成。译为:放射的刺激,引起光的扩大射出即:受激光发射;所以称为“激光”。激光具有四种特征即:亮度高、颜色纯、方向性好、相干性好。其他特征还未被人发现。目前已经研制成的激光器有上百种之多,总起来可概括为三种类别即:固体激光 Laser was developed in the 60s as a science and technology. Internationally known as “LASER” (Lesser), the term is synthesized from the prefixes of the various terms of the LIGHT AMPLICATION STIMULETED EMISSION OF RADIATION. Translated as: Radiation stimulation, causing the expansion of light that is fired: by laser emission; so called “laser.” Laser has four characteristics namely: high brightness, pure color, good directivity, good coherence. Other features have not been found. There are hundreds of lasers that have been developed so far, which can be summarized in three categories: solid-state lasers