Journal
OPTICS EXPRESS
Volume 12, Issue 19, Pages 4650-4658Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.12.004650
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We demonstrate the use of a transient polarization grating induced by two femtosecond laser pulses propagating in a LiNbO3 crystal for the generation of frequency tunable, narrow-band, picosecond THz pulses. Employing pump pulses with 150 fs duration and 2 muJ energy, the generated THz pulse has an energy up to 1.8 pJ, a pulse duration of 3 - 5 ps and a bandwidth of 0.1 THz. The central frequency can be tuned in the range from 0.5 to 3 THz. The generation efficiency of the transient grating method in comparison to other techniques is discussed. The possibility of shaping the temporal waveform of the THz pulses by simply shaping the spatial intensity distribution of the pump pulses is demonstrated. (C) 2004 Optical Society of America.
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