Abstract
The possibility of the surface-emitting second-harmonic generation (SHG) based on intersubband transitions in multiple quantum-well (QW) structures is examined theoretically. The critical role of valence band mixing is demonstrated. The off-diagonal SHG coefficients, necessary for the surface-emitting SHG, are evaluated for the transitions between the valence subbands in GaAs/AlAs QW structures are found to be comparable in magnitude to the diagonal SHG coefficients reported in literature.
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