Abstract

Terahertz (THz) pulses with a peak power of 2kW were generated in a noncollinear phase-matched GaAs crystal at room temperature. Two 200ns pulses from a dual-beam TEA CO2 laser were used for difference frequency mixing in the crystal. A comb of narrow lines (Δνν104) was obtained in the 0.53THz range with a step of 40GHz. By comparing the effective nonlinearity of GaSe with that of GaAs for THz generation, the electro-optic nonlinear coefficient for GaSe was measured to be deo=24.3±10%pmV. Using simulations we show that a 1kWTHz pulse could be amplified by a factor of 2×104 to a 10MW level in a 2m long single-pass free-electron laser.

© 2007 Optical Society of America

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