Title :
Surface-emitting unstable-resonator lasers with integrated diffractive beam-forming elements
Author :
Eriksson, N. ; Bengtsson, J. ; Ming Li ; Modh, P. ; Larsson, A.
Author_Institution :
Dept. of Optoelectron. & Electr. Meas., Chalmers Univ. of Technol., Goteborg, Sweden
Abstract :
Grating-coupled surface-emitting semiconductor lasers have been integrated with focusing and spot array generating diffractive beam-forming elements. The lasers have an unstable resonator producing a 160-μm-wide single spatial mode. The area of the outcoupler element is 160 μm×240 μm. For an outcoupler focusing at 500 μm above the surface the spot size is 9 μm×17 μm The spot size is primarily limited by aberrations in the wavefront of the guided mode.
Keywords :
III-V semiconductors; aberrations; diffraction gratings; distributed Bragg reflector lasers; gallium arsenide; indium compounds; laser beams; laser cavity resonators; laser modes; laser stability; optical focusing; quantum well lasers; surface emitting lasers; 160 mum; 17 mum; 240 mum; 500 mum; 9 mum; DBR lasers; InGaAs; InGaAs quantum well lasers; aberrations; focusing beam-forming elements; grating-coupled surface-emitting semiconductor lasers; guided mode wavefronts; integrated diffractive beam-forming elements; outcoupler element; outcoupler focusing; single spatial mode; spot array generating diffractive beam-forming elements; spot size; surface-emitting unstable-resonator lasers; unstable resonator; Diffraction; Gratings; Holography; Laser modes; Optical resonators; Optical surface waves; Semiconductor laser arrays; Surface emitting lasers; Vertical cavity surface emitting lasers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
