Intracavity contacts for low-threshold oxide-confinedvertical-cavity surface-emitting lasers |
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Authors: | Huffaker D.L. Deppe D.G. |
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Affiliation: | Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX; |
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Abstract: | 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 |
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