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  • 1
    Electronic Resource
    Electronic Resource
    Detailed analysis of second-harmonic generation near 10.6 μm in GaAs/AlGaAs asymmetric quantum wells (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 57 (1990), S. 215-217 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the observation of resonant intersubband second-harmonic generation in asymmetric GaAs/AlGaAs quantum wells using a cw or Q-switched tunable CO2 laser as the pumping source. The dependence of the second-harmonic intensity with the pump photon wavelength is presented for the first time. A Lorentzian-like second-harmonic line shape is found with a maximum at 10.9 μm and a linewidth of 0.4 μm (4.1 meV). These results are in good agreement with theoretical predictions. The expected quadratic dependence of the second-harmonic conversion efficiency with pump intensity is well verified for intensities up to 150 kW/cm2. The calibrated second-harmonic power reaches 0.13 μW for a cw pump power of 0.8 W. The value of 7.2×10−7 m/V deduced for the second-order nonlinear susceptibility is about 1900 times greater than that found in bulk GaAs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.103742
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Novel all-optical 10 μm waveguide modulator based on intersubband absorption in GaAs/AlGaAs quantum wells (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2645-2647 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Efficient all-optical modulation of mid-infrared radiations based on photoinduced intersubband absorption of a GaAs/AlGaAs multiquantum well structure is demonstrated at room temperature. The sample designed for mid-infrared waveguiding was grown by molecular beam epitaxy. A double-resonance spectroscopy of both interband and intersubband transitions of the quantum wells is presented. The intersubband resonance is found at 9.56 μm. An AlGaAs laser diode is used to optically pump the quantum wells. On/off modulation ratios as high as 150:1 are obtained with only 45 mW pump power and for mid-infrared input powers up to 0.5 W. The frequency bandwidth of the device is presently comparable to that of acousto-optic modulators available at mid-infrared wavelengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105925
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    Paper (German National Licenses)
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