Heterodyne terahertz electro-optic sampling using DAST crystal

For the first time, we demonstrate heterodyne EO sampling of terahertz pulses in a DAST crystal. Compared with lithium niobate, which was used in our previous heterodyne EO sampling studies, organic DAST crystal has a 1.5 times larger EO coefficient. Our experimental results demonstrate that DAST is a very promising material for highly sensitive terahertz EO sampling.