Phase-matched 2nd harmonic generation in asymmetric doublequantum wells
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ABSTRACT Phase-matched SHG, resonantly enhanced near X=8.6Wm, with -1% efficiency and up to 30 W peak power has been observed in asymmetric double multi-quantum well structures. Waveguide-mode and 450 wedge multi-bounce geometries were used. INTRODUCTION Quantum well structures can be tailor-made to have giant 2nd and 3rd order intersubband optical nonlinearities" 3 , enhanced near subband resonances, which may be useful for optical frequency conversion, phase conjugation, optical bistability, etc. Greatly enhanced nonlinearities in semiconductor multiple quantum wells (MQW's) look very attractive for the efficient generating new frequencies via frequency mixing and second harmonic generation (SHG). Nonetheless, SHG and difference frequency conversion efficiencies reported so far are rather small (
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