Open AccessImproved Beam Quality of Coherently Combined Angled-Grating Broad-Area Lasers
Author(s) -
Yunsong Zhao,
Lin Zhu
Publication year - 2013
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2013.2245884
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
We improve the beam quality and performance of coherently combined angled-grating broad-area lasers through current/gain confinement. We show that the nonuniform current/gain distribution in our previous lasers excites the second-order Bragg mode and degrades the beam quality. Ion implantation is used to provide a more uniform current distribution by confining the injected current within the grating area. The far-field measurement result shows that the near-diffraction-limited single-lobe envelope is obtained. Smaller threshold and larger slope efficiency are observed in the L-I curve as well.