Abstract
Terahertz (THz) pulses with a peak power of were generated in a noncollinear phase-matched GaAs crystal at room temperature. Two pulses from a dual-beam TEA laser were used for difference frequency mixing in the crystal. A comb of narrow lines was obtained in the range with a step of . 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 . Using simulations we show that a pulse could be amplified by a factor of to a level in a long single-pass free-electron laser.
© 2007 Optical Society of America
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