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Mid-Infrared Quantum Cascade Lasers With Electrical Control of the Emission Frequency

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3 Author(s)
Min Jang ; Electrical and Computer Engineering Department, University of Texas at Austin, Austin, TX, USA ; Surgey Suchalkin ; Mikhail A. Belkin

We discuss the design of mid-infrared quantum cascade lasers in which the emission frequency can be rapidly modulated by applied bias voltage. The devices are based on integrating a layer with voltage-variable refractive index, based on Stark-tunable inter-sub-band transitions, below the laser active region. A three-terminal configuration is used to independently bias the laser active region and the refractive index variation layer. The ultimate performance of the proposed scheme is analyzed theoretically and proof-of-principle devices are demonstrated experimentally. Experimentally, λ ≈ 10 μm lasers demonstrate up to 4.5-GHz frequency tuning at a temperature of 80 K.

Published in:

IEEE Journal of Quantum Electronics  (Volume:49 ,  Issue: 1 )