Generation of Ultra-broadband THz Pulses at a 200 kHz Repetition Rate with Peak Electric Field Above 100 kV/cm

We demonstrate a table-top source delivering ultra-broadband THz pulses with electric field strength exceeding 100 kV/cm at a repetition rate of 200 kHz. The source is based on optical rectification of 23 fs pulses at 1030 nm. We generate THz pulses extending to 11 THz with field amplitude of 150 kV/cm using a GaP crystal and extending up to 30 THz with field amplitude of 104 kV/cm using a GaSe crystal. Our THz source opens a route towards nonlinear time-resolved THz experiments with high signal-to-noise ratios.