Improved Beam Quality of Coherently Combined Angled-Grating Broad-Area Lasers

Author

Yunsong Zhao ; Lin Zhu

Author_Institution

Dept. of Electr. & Comput. Eng., Clemson Univ., Clemson, SC, USA

Volume

5

Issue

2

fYear

2013

fDate

Apr-13

Firstpage

1500307

Lastpage

1500307

Abstract

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.

Keywords

current distribution; diffraction gratings; ion implantation; laser beams; laser modes; light coherence; semiconductor doping; semiconductor lasers; L-I curve; beam quality; coherently combined angled-grating broad-area lasers; current distribution; far-field measurement; gain distribution; injected current confinement; ion implantation; near-diffraction-limited single-lobe envelope; second-order Bragg mode; slope efficiency; Gratings; Laser beams; Laser excitation; Laser modes; Measurement by laser beam; Pump lasers; Waveguide lasers; Diode lasers; semiconductor lasers;

fLanguage

English

Journal_Title

Photonics Journal, IEEE

Publisher

ieee

ISSN

1943-0655

Type

jour

DOI

10.1109/JPHOT.2013.2245884

Filename

6458974