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Circular-grating surface-emitting distributed Bragg reflector lasers on an InGaAs-GaAs structure for 0.48-μm applications

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6 Author(s)
Fallahi, M. ; Nat. Res. Council of Canada, Ottawa, Ont., Canada ; Chatenoud, F. ; Dion, M. ; Templeton, I.
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In this paper, we report on the design and fabrication of electrically-pumped circular-grating surface-emitting DBR lasers for operation in the 0.98-μm wavelength range. The layer structure with InGaAs-GaAs-AlGaAs strained multiquantum-wells was obtained by one-step epitaxial growth. Circular gratings are defined by electron-beam lithography around circular gain sections of different diameters. Low threshold CW operation as low as 26 mA for a 60-μm diameter gain section, and high-power pulsed operation of over 120 mW for a 100-μm diameter gain region are demonstrated. A quasi-circular far-field pattern with a divergence of about 1° is obtained

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:1 ,  Issue: 2 )