Modal Analysis of Large Spot Size, Low Output Beam Divergence Quantum-Dot Lasers

Author

Corbett, Brian ; Lambkin, Paul ; O´Callaghan, J. ; Deubert, Stefan ; Kaiser, Wolfgang ; Reithmaier, Johann Peter ; Forchel, Alfred

Author_Institution

Tyndall Nat. Inst., Cork

Volume

19

Issue

12

fYear

2007

fDate

6/15/2007 12:00:00 AM

Firstpage

916

Lastpage

918

Abstract

Large spot size ridge waveguide lasers utilizing a low modal gain single quantum dot layer emitting at 925 nm were designed and fabricated. Ridge waveguides with width <3 mum emit in a single transverse mode with a low transverse full-width at half-maximum divergence of 20deg. Wider ridges initially lase in the first-order transverse mode before collapsing to the fundamental mode. This characteristic is explained by a thermally induced increase in the refractive index of the waveguide core. All lasers operate in a single lateral mode

Keywords

laser beams; laser cavity resonators; laser modes; quantum dot lasers; refractive index; waveguide lasers; 925 nm; all-optical lasers; first-order transverse mode; full-width at half-maximum divergence; fundamental mode; large optical cavity; large spot size lasers; modal analysis; modal gain; output beam divergence; quantum-dot lasers; refractive index; ridge waveguide lasers; ridge waveguides; single lateral mode operation; single quantum dot layer; single transverse mode; Fiber lasers; Lab-on-a-chip; Laser beams; Laser modes; Modal analysis; Optical design; Optical waveguides; Quantum dot lasers; Refractive index; Waveguide lasers; Large optical cavity (LOC); low divergence; quantum-dot (QD) lasers;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2007.897569

Filename

4212155