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- W1997264879 abstract "Intersubband transitions in quantum well have extremely large oscillator strengths and induce strong nonlinear effects in structures where inversion symmetry is broken, realized by growing AlGaAs quantum wells with asymmetrical A1 gradients. These compositionally asymmetrical multiquantum wells may thus be viewed as giant “quasimolecules” optimized for optimal nonlinearities in the mid infrared. Optical rectification as well as second harmonic generation have been measured in those structures using a continuous CO2 laser. At 10.6 μm the nonlinear coefficients are more than 3 orders of magnitude higher in these samples than for bulk GaAs (i.e. χ0(2) = 5.3 × 10−6m/V, χ2ω(2) = 7.2 × 10−7 m/V) and are in good agreement with theoretical predictions. We present more complex “pseudo-molecules” involving weakly coupled quantum wells. The optical rectification effects in these devices are so large χ0(2) = 1.6 × 10−3 m/V) that application to infrared detection may be envisioned." @default.
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- W1997264879 title "Compositionally asymmetrical multiquantum wells: “Pseudo-molecules” for giant optical nonlinearities in the infrared (9–11 μm)" @default.
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- W1997264879 doi "https://doi.org/10.1016/0749-6036(90)90333-3" @default.
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