We report the highest power conversion efficiency (PCE) of 74.6% at peak and more than 70% PCE maintained up to high output power of 20W in broad stripe laser diodes (LDs) lasing at a 9xx-nm band. Optimal layer structure design including enhancement of asymmetry in waveguide structure and elimination of nonlinear resistance due to band discontinuity enables electric resistance to be reduced by 33% compared to conventional LDs without notable increase in optical internal loss. These PCE values from middle to high output power range marks the highest record reported so far.
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 Γwell 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.
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