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Proceedings Paper

Single-cycle terahertz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3 and applications to nonlinear optics
Author(s): Hideki Hirori; Koichiro Tanaka
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Paper Abstract

Using a tilted-pump-pulse-front scheme, we generate single-cycle terahertz (THz) pulses by optical rectification of femtosecond laser pulses in LiNbO3. In our THz generation setup, to obtain optimal THz beam characteristics and pumpto- THz conversion efficiency the condition that an image of a grating coincides with a tilted-optical-pulse front is fulfilled. Generated THz pulses have spectra centered at around 1 THz. A designed focusing geometry enables tight focus of the THz beam with a spot size close to the diffraction limit, and the maximum THz electric field of 1.2 MV/cm is obtained. In addition, the nonlinear interactions of GaAs quantum wells with the intense THz pulses have been studied. Here we show that the intense THz pulse, unlike a DC bias, can generate a substantial number of electron-hole pairs forming excitons that emit near-infrared luminescence. The bright luminescence associated with carrier multiplication suggests that the carriers coherently driven by a strong field can efficiently gain enough kinetic energy to induce a series of impact ionizations, which we demonstrate can increase the number of carriers by about three orders of magnitude on picosecond timescale.

Paper Details

Date Published: 15 February 2012
PDF: 6 pages
Proc. SPIE 8240, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI, 82400B (15 February 2012); doi: 10.1117/12.910063
Show Author Affiliations
Hideki Hirori, Kyoto Univ. (Japan)
Japan Science and Technology Agency (Japan)
Koichiro Tanaka, Kyoto Univ. (Japan)
Japan Science and Technology Agency (Japan)

Published in SPIE Proceedings Vol. 8240:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI
Konstantin L. Vodopyanov, Editor(s)

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