Influence of positioning errors on the coupling efficiency of a single emitter laser array.

A high coupling efficiency is required to guarantee high-output power for lasers. However, positioning errors in optical devices can lead to different degrees of attenuation for the coupling efficiency. This paper, investigates the effects of positioning errors on the coupling efficiency of optical devices. Specifically, the combining, focusing, and coupling processes of a three-wire single emitter laser array are studied through experiments and are supported by simulations. The results show that a 50 μ m position error in the Y-axis of the fiber will reduce the coupling efficiency by 44 %, and a rotation error of 0.5° in the X-axis of the reflector will reduce the coupling efficiency by 100 %. Moreover, the sensitivity of the coupling efficiency to each error is revealed. [ABSTRACT FROM AUTHOR]