Abstract
This report shows that intense multicycle terahertz pulses can be generated in two-dimensional quasi-phase-matching structures formed by placing a binary phase mask in front of the periodically poled lithium niobate crystal. The terahertz wave is emitted perpendicular to the direction of the pump pulse propagation, which is favorable for their independent control. A terahertz peak power of 0.6 MW at a frequency of 0.5 THz is predicted for the crystal at 100 K temperature. The efficiency of the pump-to-terahertz conversion is estimated to be 1.5%, with relatively moderate pump pulse energy of 4 mJ. These results could be further improved by resonance enhancement of the pump intensity in an optical cavity or by a proper choice of the pump pulse format.
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