Abstract
With a photoconductive antenna, we demonstrate time-domain detection of terahertz (THz) pulses generated from a noncollinear phase-matched, picosecond THz parametric oscillator. Since time-domain detection enables us to detect THz waves sensitively, the dynamic range of the power spectrum is ∼1000 times improved in comparison with that of a pyroelectric detector. Furthermore, multiple THz pulses are observed because of the time delay between arrayed Si prism couplers. When a single, larger Si prism coupler or a trapezoidal MgO:LN crystal is employed instead, single monocycle THz pulses are observed.
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