High conversion efficiency of second‐harmonic generation in step quantum wells

Zhenghao Chen,Dafu Cui,Meihua Li,Chao Jiang,Junming Zhou,Guozhen Yang

Applied Physics Letters（1992）

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摘要

Second‐harmonic generation due to intersubband transitions in GaAs/AlxGa1−xAs step quantum well structures has been studied with a tunable TEA CO2 laser. The maximum value of χ(2)(2ω) is found to be ∼9×10−7 m/V. Using a multipass or ‘‘waveguide’’ structure, a conversion efficiency of more than 3×10−4 has been obtained.

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