为获得能满足实际需要的高光功率输出，可以将已经成功应用于近红外波段半导体激光器的合束技术移植到量子级联激光器。讨论了量子级联激光器件的共水平面布局设计，这种设计有利于实现稳定可靠的室温连续工作；在量子级联激光器单管器件整形实验中，获得了光束质量因子M2优于2.3 的准直光束；在高效率光束合成的实验中获得了85%的合束效率。

In order to acquire high optical power for practical applications, technologies of beam combination which have been applied to semiconductors in near-infrared band successfully can also be employed to quantum cascade lasers (QCLs). The coplanar arrangement of QCLs is discussed which is helpful to maintain stable and reliable continuous-wave room-temperature operation of QCLs. In the experiment of collimation for a single QCL, collimated beams with beam quality factor M2 less than 2.3 are achieved. In the experiment of high-efficiency beam combination, the efficiency of 85% is achieved.