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Lateral waveguiding in stripe-geometry double-heterostructure lasers below the lasing threshold

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3 Author(s)
Engelmann, R. ; Solid State Laboratory, Hewlett-Packard Laboratories, Palo Alto, CA, USA ; Kerps, D. ; Nunes, F.

Structure in the far-field pattern of current-confined stripe-geometry double-heterostructure lasers in the angle range \pm 20\deg is observed at current levels of less than frac{1}{4} of threshold value. The behavior is explained by leaky-mode guiding due to a gain maximum under the stripe and to a negative refractive index step on the order of -0.01.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:15 ,  Issue: 8 )