Intense broadband THz generation in the organic crystal BNA by compression of ytterbium laser pulses based on a gas-filled hollow-core fiber

We investigate the enhanced THz generation characteristics of the organic crystal BNA when pumped by compressed ytterbium laser pulses. When the pump pulses are compressed down to 42 fs using a gas-filled hollow-core fiber and chirped mirrors, the THz conversion efficiency is increased by 75%, and the generated frequency spectrum extends up to 12 THz. These findings demonstrate the benefits of using compressed ytterbium laser pulses for enhancing THz generation in suitable nonlinear crystals for the development of intense and broadband THz sources.