Abstract
This paper describes the fi rst demonstration of the time-domain measurements of terahertz (THz)-wave pulses generated from a picosecond optical parametric oscillator (ps-OPO). Unlike pyroelectric detectors, photoconductive antennas allow us to observe the time-discrete THz-wave pulses that depend on arrayed Si-prism couplers. By replacing them with a larger single type, the phase distortion of THzwave pulses was compensated and a single THz-wave pulse with the peak frequency of ～0.2 THz was obtained.
