Extended Data Fig. 1: Experimental set-up.
From: Extremely efficient terahertz high-harmonic generation in graphene by hot Dirac fermions
Tunable multicycle THz pulses (red) from the undulator of the TELBE facility2 are used to irradiate the graphene sample. 100-fs pulses from a Ti:sapphire laser system (brown) are used to probe the transmitted and emitted THz pulses by free-space electro-optic sampling. PD, photodiode; BS, beamsplitter; Pol., polarizer.
