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Observation of large second order susceptibility via intersubband transitions at λ∼10 μm in asymmetric coupled AlInAs/GaInAs quantum wells
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10.The definition of integrated absorption strength is is the absorption fraction and is related to the reflectivity in all the wavelength range of interest and the transmission by where
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13.Note that the detected intersubband spontaneous emission at can be shown to be completely negligible due to the extremely small quantum efficiency of electronic transitions and the nondirectionality of the emission.
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