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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1992),
  • paper QTuN5

Band-gap engineering of coupled-quantum-well "molecules" with large-field-tunable nonlinear optical properties

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Abstract

We discuss semiconductors exhibiting large- electric-field-tunable nonlinear optical properties associated with intersubband transitions in the infrared. By careful bandgap engineering, we have designed coupledwell semiconductors (Fig. 1) in the AlInAs/GaInAs system with extremely large |χ2ω(2)| and |χ3ω(3)| and have been able to observe for the first time the resonant Stark enhancement of |χ2ω(2)| third-harmonic generation, and multiphoton ionization in a quantum well. These structures are characterized by a large linear Stark effect so that the nonlinear susceptibilities can be resonantly enhanced or quenched by application of a moderate electric field.

© 1992 Optical Society of America

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