Abstract
Based on a comprehensive model of waveguide-mode second-harmoic generation in semiconductor quantum wells, we determine material, structural and waveguide parameters that are predicted to yield conversion efficiences exceeding by two orders of magnitude the best experimental results obtained to date and discuss the reasons for the failure to observe high efficiencies in previous experimental studies. An optimized In 0.53Ga 0.47As In 0.52Al 0.48 As asymmetric double-well structure is predicted to produced a peak efficiency of 14% at 10.6 μm for a pump-beam intensity of 20 MW cm −2. A novel mechanism for rapidly modulating the second-harmonic output from 14% to 0 by tuning the coherence length with an applied electric field is analyzed.
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