A powerful laser and astronomical telescope are used for this measurement . 在测量时使用了一台功率强大的激光器和一台天文望远镜。
At this time, the field of semiconductor lasers is dominated by heterojunction devices . 目前，在半导体激光器领域中，异质结激光器已占居支配地位。
The he-cd laser, which is a recent arrival on the scene, emits at 325.0 nm and 441.6 nm . 最近出现的HeCd激光器在3250纳米和4416纳米的波长上发射。
the beam from the laser l passes through the shutter s, is spread by the objective lens . 激光器L发出的光束经过快门S，被物镜所扩散。
Development of such distributed feedback heterostructure lasers requires crystal growth on corrugated layers . 研制这种分布反馈双异质结构激光器要求在皱折层上生长出单晶层。
Maiman's announcement of the first operative laser came at a new york news conference on july 7, 1960 . 迈芒在1960年7月7日纽约的一次记者招待会上宣布了第一台激光器运转的消息。
Because gas lasers were often used as the light source, their beam had to be coupled into the thin-film wave guides . 由于气体激光器常用作光源，故必须将其光束耦合到薄膜波导中去。
The laser's basic structure, also called the resonant cavity, is essentially a long tube with mirrors at each end . 激光器的基本结构（也称为谐振腔）实质上是一根两端都有反射镜的长管。
The improvement in the basic gaas laser performance, however, could not be brought about by an evolutionary development process . 但是GaAs激光器基本性能的改进不能依靠这种渐进的发展过程。
After more than a decade of research, the semiconductor laser has emerged as an important component in optoelectronic systems . 经过十多年的研究，半导体激光器已经发展成为光电系统的重要器件。
