Enhanced power conversion efficiency in 900-nm range single emitter broad stripe laser diodes maintaining high power operability

Design optimization of single emitter broad stripe 900-nm laser diodes was experimentally studied to achieve high power conversion efficiency (PCE) for a use in fiber laser systems. We chose two approaches for PCE improvement. The first is an optical confinement factor Γ_well optimization which affects threshold current and internal loss. The second is electric resistance minimization to suppress unwanted power consumption causing heat generation. As a result, the newly designed LD successfully demonstrates the high PCE of 72.5 % at middle power range and 66.7 % at practical high power of 20 W.