组合透镜 meaning in English

casket lenses
composite lens

3 . because traditional coupling system composed with cylinder lens and focus lens has the disadvantages of difficult to encapsulation and modulate , a new practical method brings forward : the output light from laser diode is collimated using a section of optical fiber with the diameter of 600 m instead of cylinder lens , and a sphere ? end lens
3 .针对由柱透镜和聚焦透镜组成的组合透镜耦合系统中存在的封装和调试困难等问题,提出了:用一段直径为600 m的裸石英光纤代替柱透镜,对半导体激光器输出光束进行准直整形;用球透镜光纤对准直后的光束进行聚焦,直接实现和光纤耦合,来代替聚焦透镜和光纤耦合的环节。
In the second chapter , during the study of compound x - ray refractive lenses , diffraction function of compound lens is derived in the light of refraction and absorption effect and the design theory of x - ray is deduced using diffraction theory in connection with the characteristic of x - ray band . the structure design of this device and micro - machined technique are also discussed
在第二章x射线聚焦组合透镜的研究中，针对x射线波段的特性，综合考虑折射和吸收效应得出组合透镜的衍射屏函数，利用衍射理论推导出x射线聚焦组合透镜的设计理论并进行结构设计与微细加工制作技术研究。