Extended Data Fig. 7: Raw spectra from the FHG experiment.
From: Extremely efficient terahertz high-harmonic generation in graphene by hot Dirac fermions
These as-measured spectra show the spectral amplitude as determined from a measurement with the bare SiO2 substrate as a reference and a measurement of the graphene sample. The incident THz peak field in the fundamental at 0.37 THz was 40 kV cm−1 when using two filters in the incident beam. Insignificant transmission at the fundamental frequency and no spurious background at the FHG frequency band is observed in the reference field measurement.
