Resonant X-Ray Second Harmonic Generation

抄録

The purpose at this beamtime was to observe coherent resonant second harmonic generation (SHG) in Gallium Arsenide (GaAs) around the Ga K-edge. The experiment followed a previous measurement of SHG far above resonances in diamond preformed at the SACLA x-ray free electron laser [1]. However, as opposed to the case of far above resonance SHG, the description of resonant SHG requires a full quantum model. We did not measure nonlinear second harmonic generation in GaAs during that beamtime. We could only estimate an upper limit for the magnitude of the effect.