Open AccessHigh-power high-brightness 980 nm lasers with >50% wall-plug efficiency based on asymmetric super large optical cavity
Author(s) -
Shaoyu Zhao,
Aiyi Qi,
Mingjin Wang,
Hongwei Qu,
Yixuan Lin,
Fangfang Dong,
Wanhua Zheng
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.003518
Subject(s) - optics , materials science , laser , beam divergence , brightness , diode , optoelectronics , optical power , laser beam quality , physics , laser beams
High-power high-brightness super large optical cavity laser diodes with an optimized epitaxial structure are investigated at the wavelength of 980 nm range. The thicknesses of P- and N-waveguides are prudently chosen based on a systematic consideration about mode characteristics and vertical far-field divergences. Broad area laser diodes show a high internal quantum efficiency of 98% and a low internal optical loss of 0.58 cm -1 . The ridge-waveguide laser with 7 μm ridge and 3 mm cavity yields 1.9 W single spatial mode output with far-field divergence angles of 6.8° in lateral and 11.5° in vertical at full width at half maximum under 2 A CW operating current. The corresponding M 2 values are 1.77 and 1.47 for lateral and vertical, respectively, and the corresponding brightness is 76.8 MW‧cm -2 ‧sr -1 . The far-field divergence angles with 95% power content are in the range of 24.7° to 26.1° across the whole measured range.