We demonstrate efficient optical rectification in the organic crystal BNA (N-benzyl-2-methyl-4-nitroaniline). driven by a temporally compressed. commercially available industrial Yb-laser system operating at a 540 kHz repetition rate. Our terahertz (THz) source reaches 5. https://safeersappliancers.shop/product-category/bosch-nbs113br0b-serie-2-built-under-59cm-a-b-electric-double-oven-stainless/