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Short-Wavelength (λ ≈ 3.6 μm) In0.73Ga0.27Asndash;AlAsndash;InP Quantum-Cascade Laser

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3 Author(s)
Semtsiv, M.P. ; Phys. Dept., Humboldt-Univ., Berlin ; Dressler, S. ; Masselink, W.T.

We describe the design and implementation of a short-wavelength quantum-cascade laser emitting in the range of 3.6-3.7 mum at 77 K and in the range of 3.8-3.9 mum at 300 K. The shortest wavelength laser emission observed at 77 K is lambda=3.62 mum. The active region is based on the strain-compensated In0.73Ga0.27As-AlAs heterosystem on InP. The laser operates in pulsed mode up to 300 K, and in continuous-wave mode at 77 K. Laser threshold current densities are as low as 600 A/cm2 at 10 K, 800 A/cm2 at 77 K, and 3.8 kA/cm2 at 300 K in pulsed mode. The temperature coefficient T0 is as high as 143 K. Driven with 50% duty cycle at 77 K, lasers deliver up to 70 mW average power per facet and the differential quantum efficiency is as high as 14% per cascade

Published in:

Quantum Electronics, IEEE Journal of  (Volume:43 ,  Issue: 1 )