Abstract
A high-energy THz-wave output has been experimentally demonstrated with a terahertz-wave parametric oscillator based on a surface-emitted configuration. Through optimizing the cavity length and pump beam size, the maximum THz-wave output energy of 854 nJ pulse−1 was obtained at 1.62 THz. The conversion efficiency was 0.57 × 10–5, corresponding to the photon conversion efficiency of 0.099%. The THz beam profile was measured with a THz imager, which had a Gaussian profile. The measured beam diameter sizes were 423 μm and 258 μm in the horizontal and vertical directions, respectively. A wide tunable range from 0.75 to 2.81 THz was realized.
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