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1. | a concave reflector used to produce a parallel beam when the source is placed at its focus or to focus |
| 当光源来自焦点以产生平行光束或者平行光束以产生焦点的凹入的反射镜。 |
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2. | equipment that uses a magnetic or electric field in order to focus a beam of electrons. |
| 利用磁场或电场来聚焦一束电子的设备。 |
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3. | electron lens:any of various devices that use an electric or a magnetic field to focus a beam of electrons |
| 电子透镜:通过一个电场或一个磁场来使一束电子会聚的一种装置. |
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4. | zone plate is the essential of HOEs, which is the interference between plane wave and sphere wave, can focus |
| 摘要干涉式波带板系由平面波和球面波两道光波干涉而成,为研究全像光学元件的基础,其可经由绕射作用达到聚焦效果,犹如使用传统凸透镜或凹面镜所产生的效果。 |
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