Optical element, light source device, optical head device and optical information processing unit.

光学元件，光源装置，光头装置以及光信息处理装置。

youdao

Studying the theory of optical pickup head unit (OPU) and how to pickup the signal on the disk. Based on these theories, it analyse the structure of the focusing and tracking device.

研究光学拾取头的基本原理和光盘信号拾取原理，简要分析了实际的光学头聚焦伺服和循迹伺服的机械结构。

youdao

In April, Matthews lured Donald Smith, the president of Nortel's optical broadband unit, to head Mitel.

FORBES: Celtic charm