Grating-coupled surface-emitting laser with a hyperbolic unstable resonator producing a stable focused output beam

A grating-coupled surface-emitting semiconductor laser has been integrated with a focusing diffractive beamforming element. A hyperbolic unstable resonator is used to introduce mode discrimination and suppress filamentation in a broad geometry, resulting in a 200-μm-wide coherent output. The light i...

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Bibliographic Details
Published in:IEEE photonics technology letters 1999-11, Vol.11 (11), p.1366-1368
Main Authors: Eriksson, N., Modh, P., Larsson, A.
Format: Article
Language:English
Subjects:
Beams (radiation)
Diffraction gratings
Focusing
Gratings
Laser beams
Laser feedback
Laser modes
Laser stability
Lasers
Optical resonators
Optical surface waves
Resonators
Semiconductor lasers
Surface emitting lasers
Threshold currents
Waveguide lasers
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Summary:A grating-coupled surface-emitting semiconductor laser has been integrated with a focusing diffractive beamforming element. A hyperbolic unstable resonator is used to introduce mode discrimination and suppress filamentation in a broad geometry, resulting in a 200-μm-wide coherent output. The light is focused 500 μm above the laser surface to a spot size of 5×7 μm. A remarkable beam stability is observed with very small spot size variation and beam-steering up to three times the threshold current under continuous operation.
ISSN:1041-1135
1941-0174
DOI:10.1109/68.803047