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Room-temperature operation of 3.6 μm In0.53Ga0.47As/Al0.48In0.52As quantum cascade laser sources based on intracavity second harmonic generation

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8 Author(s)
Jang, M. ; Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78758, USA ; Adams, R.W. ; Chen, J.X. ; Charles, W.O.
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We discuss a design of short-wavelength quantum cascade laser sources based on intracavity second harmonic generation. A passive heterostructure tailored for giant optical nonlinearity is integrated on top of an active region and patterned for quasiphase matching. We demonstrate operation of λ≈3.6 μm lattice-matched InGaAs/AlInAs/InP sources with approximately 6 μW of second-harmonic output at room temperature and conversion efficiency of approximately 130 μW/W2. Threshold current densities of devices with a nonlinear section were similar to that of the reference lasers without the nonlinear section.

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Applied Physics Letters  (Volume:97 ,  Issue: 14 )