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Proceedings Paper

High-performance circular grating-coupled surface emitter with focused output beam
Author(s): Sigurgeir Kristjansson; Niklas Eriksson; Stephen J. Sheard; Anders G. Larsson
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Paper Abstract

The modal performance of focusing circular grating-coupled surface-emitting lasers has been investigated. Both the effects of reducing the resonator diameter and introducing an unpumped indentation in the center of the resonator have been studied. We have found that inclusion of such an unpumped central indentation can greatly improve the spatial mode behavior, resulting in a very uniform near field intensity, single wavelength emission, and a focused spot size only 1.5 times the diffraction limit for a laser oscillating in the fundamental circular mode. Our measurements at different drive currents show that the modal behavior of the laser is stable up to at least three times the threshold current, and based on the near and far-field intensity distributions, the laser is possibly lasing simultaneously in two orthogonal first order circular modes. Reducing the resonator diameter of lasers without an unpumped central indentation does not offer similar improvement to the modal behavior.

Paper Details

Date Published: 1 April 1999
PDF: 6 pages
Proc. SPIE 3628, In-Plane Semiconductor Lasers III, (1 April 1999); doi: 10.1117/12.344519
Show Author Affiliations
Sigurgeir Kristjansson, Chalmers Univ. of Technology (United States)
Niklas Eriksson, Chalmers Univ. of Technology (Sweden)
Stephen J. Sheard, Univ. of Oxford (United Kingdom)
Anders G. Larsson, Chalmers Univ. of Technology (Sweden)


Published in SPIE Proceedings Vol. 3628:
In-Plane Semiconductor Lasers III
Hong K. Choi; Peter S. Zory, Editor(s)

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