Difference-frequency generation and sum-frequency generation near the band gap of zincblende crystals

We present recent experimental results of difference‐frequency generation (DFG) and sum‐frequency generation (SFG) from zincblende materials. We measure the radiation field of difference‐frequency generation and the radiation intensity of sum‐frequency generation versus crystallographic orientation and fundamental photon energy. The simultaneous measurement of the angular dependence of polarized DFG and SFG is well characterized by the bulk second‐order nonlinearity calculation. Pronounced resonant behaviors near the GaAs band gap for both radiations (DFG and SFG) are compared.

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