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

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3 Author(s)
Eriksson, N. ; Dept. of Microelectron., Chalmers Univ. of Technol., Goteborg, Sweden ; Modh, P. ; Larsson, A.

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.

Published in:

Photonics Technology Letters, IEEE  (Volume:11 ,  Issue: 11 )