We generated $1\mathrm{mW}$ of average output power at $2.8\mathrm{THz}$ (bandwidth of $\sim 300\mathrm{GHz}$ ) in a diffraction-limited beam by placing a $6\text{-}\mathrm{mm}$ -long quasi-phase-matched GaAs crystal inside the cavity of a synchronously pumped optical parametric oscillator (OPO). The OPO used type-II-phase-matched periodically poled lithium niobate as a gain medium and was pumped by a mode-locked laser at $1064\mathrm{nm}$ , with a $7\mathrm{ps}$ pulse duration, $50\mathrm{MHz}$ repetition rate, and $10\mathrm{W}$ average output power. The terahertz radiation was generated by difference frequency mixing between the signal and idler waves of the near-degenerate doubly resonant OPO.

© 2007 Optical Society of America

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