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Intracavity contacts for low-threshold oxide-confined vertical-cavity surface-emitting lasers

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2 Author(s)
D. L. Huffaker ; Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA ; D. G. Deppe

Very low threshold vertical-cavity surface-emitting lasers are demonstrated using intracavity contacts, an upper dielectric Bragg reflector, and an undoped lower AlAs-GaAs Bragg reflector. The undoped lower mirror allows the demonstration of the highest differential efficiency yet achieved for sub-100-μA threshold, which is 60% for a 67-μA threshold. Devices with smaller output coupling show threshold current densities as low 98 A/cm2, and a minimum threshold current of 23 μA for a small aperture.

Published in:

IEEE Photonics Technology Letters  (Volume:11 ,  Issue: 8 )