Phys. Rev. Lett. 72, 2183–2186 (1994)Resonant harmonic generation and dynamic screening in a double quantum wellReceived 10 December 1993; published in the issue dated 4 April 1994 Second- and third-harmonic generation are observed in a semiconductor heterostructure which approximates a two-state system with an 11-meV level spacing. A resonance in the second- (third-) harmonic generation is found when the depolarization-shifted infrared absorption peak is Stark tuned through 2 (3) times the pump frequency. These resonances are thus associated with the depolarization-shifted, and not the bare, intersubband energy. Data are analyzed with a theory of second-harmonic generation including dynamic screening. Saturation is observed at pump intensities >10 kW/cm2. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.72.2183
DOI:
10.1103/PhysRevLett.72.2183
PACS:
42.65.Ky, 73.20.Dx, 78.66.Fd
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