光束合光系統

工研院創新前瞻技術研究計畫

宋育誠、何淙潤、蔡直佑、林士廷

一種光束合光系統，包括多個雷射二極體、一準直微透鏡陣列、一微透鏡陣列組及一光耦合模組。每一雷射二極體提供單一波長光束，準直微透鏡陣列包含多個準直微透鏡單元。這些準直微透鏡單元適於將這些單一波長光束準直。微透鏡陣列組包含一第一微透鏡陣列、一低通濾波元件以及一第二微透鏡陣列。低通濾波元件具有一截止角頻率，使部分的這些單一波長光束以小於截止角頻率的方式通過低通濾波元件，以形成多個濾後光束，並入射於第二微透鏡陣列。光耦合模組將這些濾後光束合光為一輸出光束。

A beam combining system including a plurality of laser diodes, a collimating micro-lens array, a micro-lens array set, and a light coupling module is provided.  Each of the laser diodes provides a single wavelength beam.  The collimating micro-lens array includes a plurality of collimating micro-lens units which are adapted to collimate the single wavelength beams.  The micro-lens array set includes a first micro-lens array, a low pass filtering element, and a second micro-lens array.  The low pass filtering element has a cut-off angular frequency which allows parts of the single wavelength beams having angular frequencies less than the cut-off angular frequency to pass through the low pass filtering element, so as to form a plurality of filtered beams incident on the second micro-lens array.  The light coupling module combines the filtered beams into an output beam.