High-Intensity THz Pulses Generation In Lithium Niobate Using A Reflective Echelon Scheme
Résumé
This work analyzes how the beam size and the repetition rate affect the THz generation efficiency in lithium niobate (LiNbO3) using the RES (Refractive Echelon Mirror) configuration. Our THz source is driven by an ytterbium-fibre-based chirped-pulse amplifier system. The system delivers ultrashort pulses of 300fs duration with a maximum energy of 240 μJ at 330 kHz. It is found that by optimizing the pump beam size on the LiNbO 3 crystal, we measure a THz power of 114 mW for 44.5 W pump power at 205 MHz repetition rate, corresponding to a total optical-to-THz efficiency of 0.25%.