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High-performance three-layer 1.3-μm InAs-GaAs quantum-dot lasers with very low continuous-wave room-temperature threshold currents

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10 Author(s)
Liu, H.Y. ; Dept. of Electron. & Electr. Eng., Univ. of Sheffield, UK ; Childs, D.T. ; Badcock, T.J. ; Groom, K.M.
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The combination of high-growth-temperature GaAs spacer layers and high-reflectivity (HR)-coated facets has been utilized to obtain low threshold currents and threshold current densities for 1.3-μm multilayer InAs-GaAs quantum-dot lasers. A very low continuous-wave (CW) room-temperature threshold current of 1.5 mA and a threshold current density of 18.8 A/cm2 are achieved for a three-layer device with a 1-mm HR/HR cavity. For a 2-mm cavity, the CW threshold current density is as low as 17 A/cm2 for an HR/HR device. An output power as high as 100 mW is obtained for a device with HR/cleaved facets.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 6 )