High brightness fiber coupled diode laser module with 200 W class output power

Pumping fiber laser systems requires high brightness and high power fiber coupled diode laser module. In this paper, a method to get the high brightness and high power fiber coupled diode laser module is proposed, which is achieved by technologies of precision beam collimation and free space beam combining based on mini-bar diode laser chip. Experiment is carried out on linear polarization diode laser using the multimode fiber with 200 m core diameter and 0.22 numerical apertures. The laser output from fiber is 280 W, equalizing brightness of 5.87 MW/(cm2sr) and the wall plug efficiency is 45.0%. With polarization beam combining method, output power can reach 500 W and brightness will exceed 10 MW/(cm2sr). The experiment results show that this method can be used in developing high brightness fiber coupled diode laser module with multi-hundred watts class output power.