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Near-room-temperature continuous-wave operation of multiple-active-region 1.55 μm vertical-cavity lasers with high differential efficiency

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4 Author(s)
Kim, J.K. ; Electrical and Computer Engineering Department, University of California–Santa Barbara, Santa Barbara, California 93106 ; Nakagawa, S. ; Hall, E. ; Coldren, L.A.

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We present completely monolithic, single-step grown, bipolar cascade vertical-cavity surface-emitting lasers at 1.55 μm with a greater-than-unity differential quantum efficiency. A typical device had a threshold current density of 1 kA/cm2, a threshold voltage of 3.2 V, and demonstrated continuous wave operation up to 8 °C. Devices smaller than 10 μm in diameter lased single mode. Active regions in our device were epitaxially stacked in three stages. This technique of multiple-active regions enabled the greater-than-unity differential quantum efficiency operation, which is essential in constructing high-efficiency microwave optical links with gain. We report the device characteristics and a model on the scaling properties of active region stacking in multiple-active-region vertical-cavity lasers. © 2000 American Institute of Physics.

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Applied Physics Letters  (Volume:77 ,  Issue: 20 )