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Surface-emitting tapered unstable resonator laser with integrated focusing grating coupler

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4 Author(s)
Kristjansson, S. ; Microtechnol. Center at Chalmers & Photonics Lab., Chalmers Univ. of Technol., Goteborg, Sweden ; Eriksson, N. ; Modh, P. ; Larsson, A.

We report on the fabrication and operation characteristics of a grating-based, surface-emitting, tapered unstable resonator laser with a trumpet shaped taper and a focusing outcoupler. The laser has a low threshold current density of 225 A/cm/sup 2/. It operates with a spatially coherent field and the near-field intensity indicates stable, filamentation free behavior up to at least 3/spl times/ the threshold current under continuous operation. At low drive currents the laser produces a nearly diffraction limited focused spot. With increasing current, the focused spot size increases and multiple side-lobes develop at high currents. We attribute this to a change in the phase of the emitted wavefront associated with thermal effects in the gain region.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 10 )