Free-electron laser nonlinear spectroscopy of doubly resonant (5.5-3.0um and 4.1-2.1 um)InGaAs/AlGaAs asymmetric quantum wells

Eric L. Martinet; Gary L. Woods; Herman C. Chui; James S. Harris Jr.; Martin M. Fejer; Chris W. Rella; Bruce A. Richman

doi:10.1117/12.175710

11 May 1994 Free-electron laser nonlinear spectroscopy of doubly resonant (5.5-3.0um and 4.1-2.1 um)InGaAs/AlGaAs asymmetric quantum wells

Eric L. Martinet, Gary L. Woods, Herman C. Chui, James S. Harris Jr., Martin M. Fejer, Chris W. Rella, Bruce A. Richman

Author Affiliations +

Proceedings Volume 2139, Quantum Well and Superlattice Physics V; (1994) https://doi.org/10.1117/12.175710
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

Conduction band intersubband absorption and second harmonic generation (SHG) are demonstrated in doubly resonant asymmetric step high indium content quantum wells (QW) grown on a GaAs substrate. Intersubband absorption peaks at 5.51 micrometers and 3.05 micrometers corresponding to the 1 to 2 and 1 to 3 transitions are measured. The susceptibility of SHG from the QW, (Chi) _QW⁽²), is measured using a free electron laser by interference between the SHG fields generated from the QW and the GaAs substrate. A large asymmetry in the SHG power with rotation angle of the sample arising from (Chi) _QW⁽²) is observed. The magnitude and phase of (Chi) _QW⁽²) is measured in the 4.6 - 6.3 micrometers pump wavelength range. (Chi) _QW⁽²) is of maximum amplitude at 6.0 micrometers with a value of 145 +/- 20 nm/V. A change in the sign of the phase of (Chi) _QW⁽²) within the SHG resonance is demonstrated for the first time. Agreement of both the linear and nonlinear properties to a simple model assuming Lorentzian linewidths is discussed. SHG of 2.0 micrometers light is also demonstrated in coupled In_0.60Ga_0.40As/AlAs quantum wells.

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Eric L. Martinet, Gary L. Woods, Herman C. Chui, James S. Harris Jr., Martin M. Fejer, Chris W. Rella, and Bruce A. Richman "Free-electron laser nonlinear spectroscopy of doubly resonant (5.5-3.0um and 4.1-2.1 um)InGaAs/AlGaAs asymmetric quantum wells", Proc. SPIE 2139, Quantum Well and Superlattice Physics V, (11 May 1994); https://doi.org/10.1117/12.175710

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