  We characterize the terahertz (THz) generation of
N-benzyl-2-methyl-4-nitroaniline (BNA), with crystals ranging in thickness from
123-700 {\mu}m. We compare excitation using 800-nm and 1250 to 1500-nm
wavelengths. Pumping BNA with 800-nm wavelengths and longer near-infrared
wavelengths results in a broad spectrum, producing out to 6 THz using a 100-fs
pump, provided the BNA crystal is thin enough. ~200 {\mu}m or thinner crystals
are required to produce a broad spectrum with an 800-nm pump, whereas ~300
{\mu}m thick crystals are optimal for broadband THz generation using the longer
wavelengths. We report the favorable THz generation and optical characteristics
of our BNA crystals that make them attractive for broadband, high-field THz
generation, and we also find significant differences to BNA results reported in
other works.

Optics;Materials Science