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Intersubband χ3 in coupled InGaAs-AlGaAs multiple quantum wells

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3 Author(s)
Rabinovich, W.S. ; Naval Res. Lab., Washington, DC, USA ; Beadie, G. ; Katzer, D.S.

The third-order nonlinearity, χ3(ω,ω,-ω), is measured for a mid-infrared intersubband transition in strained InGaAs-AlGaAs multiple quantum wells (MQW's). The high conduction band offset of this system allows an intersubband transition at 3.1 μm. The level structure of the quantum well is designed to include a meta-stable trapping level, resulting in a peak saturation intensity of 6 MW/cm2 at Brewster's angle, approximately 20 times lower than would be found in a square quantum well with similar linewidth. A near-resonant n2 of 8.4×10-7 cm2/W at 3.1 μm is calculated. The off-resonant n2 is also calculated and shown to be attractive at wavelengths as short as 1.55 μm

Published in:

Quantum Electronics, IEEE Journal of  (Volume:34 ,  Issue: 6 )