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High-Power 2 \mu {\rm m} Diode Lasers With Asymmetric Waveguide

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3 Author(s)
Jianfeng Chen ; Dept. of Electr. & Comput. Eng., Stony Brook Univ., Stony Brook, NY, USA ; Kipshidze, G. ; Shterengas, L.

Asymmetric laser heterostructure was developed to improve beam properties of GaSb-based diode lasers emitting near 2 μm. It was demonstrated that the lasers with narrow waveguide and asymmetric claddings could have fast axis beam divergence below 40°. High-power diode lasers with 100-μm-wide output aperture generate more than 1.5 W of continuous wave (CW) output power in a beam with fast axis beam divergence of 50°. Power conversion efficiency of the 2 μm emitters peaked at 28%. CW threshold current density of 85 A/cm2 was achieved at 20°C. Passively cooled 18-element linear laser arrays generated more than 10 W of CW power at 50 A. Above 3 W of CW power was obtained from 7-fiber bundle at 7 A.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:46 ,  Issue: 10 )