Grating-coupled surface-emitting laser with a hyperbolic unstable resonator producing a stable focused output beam
- 1 November 1999
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 11 (11) , 1366-1368
- https://doi.org/10.1109/68.803047
Abstract
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-/spl mu/m-wide coherent output. The light is focused 500 /spl mu/m above the laser surface to a spot size of 5/spl times/7 /spl mu/m. 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.Keywords
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