High power 940 nm quantum well laser with asymmetric structure

In order to improve the performance of the general broad area high power 940 nm InGaAs/GaAs semiconductor laser diode (LD), we design a new type quantum well LD with an asymmetric waveguide and cladding structure. High material quality with low internal loss of 0.44 mm-1 has been achieved using low pressure metal organic chemical vapor deposition (LP-MOCVD) method. Broad-area lasers were fabricated with the wafers grown on GaAs substrates. For the 940 nm devices with 100 m-wide stripe and 2000 m-long cavity under 25 ℃ continuous wave (CW) operation condition of 10 A, the typical threshold current is 251 mA, the slope efficiency is 1.22 W/A , and the maximum output power reaches 9.6 W. The laser diode yielded a maximum power conversion efficiency over 70%.