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Electrically-pumped vertical-cavity lasers with AlxOy-GaAs reflectors

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6 Author(s)
M. H. MacDougal ; Dept. of Electr. Eng., Univ. of Southern California, Los Angeles, CA, USA ; Gye Mo Yang ; A. E. Bond ; Chao-Kun Lin
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We have fabricated the first electrically-pumped vertical-cavity surface-emitting lasers (VCSELs) which use oxide-based distributed Bragg reflectors (DBRs) on both sides of the gain region. They require a third the epitaxial growth time of VCSELs with semiconductor DBRs. We obtain threshold currents as low as 160 μA in VCSELs with an active area of 8 μm×8 μm using a two quantum well InGaAs-GaAs active region. By etching away mirror pairs from the top reflector, quantum efficiencies as high as 61% are attained, while still maintaining a low threshold current of 290 μA.

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IEEE Photonics Technology Letters  (Volume:8 ,  Issue: 3 )