High-Power Continuous-Wave Operation of BeZnCdSe Single-Quantum-Well Green Laser Diodes

The laser performance of BeZnCdSe single-quantum-well green laser diodes (LDs) was improved. In particular, high-power lasing over 50mW was achieved. The high-resolution lasing spectrum indicates a peak wavelength of 536 nm. The far-field patterns (FFPs) of the 5-mu m-wide mesa LDs show unimodal characteristics, and the perpendicular and horizontal beam-divergence angles for full width at half maximum are 21 and 2.2 degrees, respectively. The wall-plug efficiency (WPE) of the 2-mu m-wide mesa LDs is 3.6% at an optical output power of 50mW. The internal loss (alpha(i)) and internal differential quantum efficiency (eta(i)) of the 10-mu m-wide-mesa LDs were estimated to be 3.5 cm(-1) and 0.22, respectively. (C) 2012 The Japan Society of Applied Physics