We report generation of terahertz (THz) radiation in a planar $61\text{-}\mu \mathrm{m}$ -thick GaAs waveguide with a ${\mathrm{TM}}_0$ propagation mode, achieved by phase-matched difference frequency mixing. The THz output was centered near $2\mathrm{THz}$ and had $1\mu \mathrm{W}$ average power. As a pump source we utilized both the signal and the idler outputs of a near-degenerate type II synchronously pumped optical parametric oscillator operating near $2\mu \mathrm{m}$ with the average powers of 250 and $750\mathrm{mW}$ , correspondingly.

© 2008 Optical Society of America

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