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Proceedings Paper

Tunable picosecond THz-wave generation based on trapezoidal MgO:LiNbO3 crystal in novel pentagram-shaped pump-enhancement cavity
Author(s): Yuma Takida; Yuzuru Tadokoro; Hiroshi Kumagai; Shigeki Nashima; Ataru Kobayashi
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Paper Abstract

It is well known that lithium niobate (LiNbO3) has excellent characteristics for efficient tunable/broadband THz-wave generation. Over the last few years, we have investigated novel THz-wave sources based on MgO-doped LiNbO3 (MgO:LiNbO3), and have succeeded in developing a tunable picosecond THz-wave source by using a novel pentagramshaped pump-enhancement cavity. One of the limiting factors in efficient THz-wave generation is the strong absorption by MgO:LiNbO3 in THz-wave region. To overcome this problem, we employ a surface-emitted configuration which consists of a trapezoidal MgO:LiNbO3 crystal and a pump-enhancement cavity folded in the shape of a pentagram. The pentagram-shaped cavity is designed for the noncollinear dual resonance of both pump and one of the down-converted waves. As a result, 1.5-ps pump pulses from a mode-locked Ti:sapphire laser operating at 780 nm allow tunable THzwave generation via parametric down-conversion resulting from stimulated phonon-polariton scattering in the MgO:LiNbO3 crystal. By slightly translating the position of one of the cavity mirrors, we experimentally find that the THz-wave frequency is tunable in the range from 0.1 to 3.5 THz with the average output power of dozens of nanowatts. The maximum THz-wave average power is up to 40 nW around 2 THz at the pump power of 800 mW, which is several times higher than the THz-wave output generated by using rectangular MgO:LiNbO3 crystals for Si-prism-coupled configuration under the same pump condition.

Paper Details

Date Published: 27 March 2013
PDF: 6 pages
Proc. SPIE 8604, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII, 86041F (27 March 2013); doi: 10.1117/12.2001627
Show Author Affiliations
Yuma Takida, Osaka City Univ. (Japan)
The Japan Society for the Promotion of Science (Japan)
Yuzuru Tadokoro, Osaka City Univ. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)
Kitasato Univ. (Japan)
Shigeki Nashima, Osaka City Univ. (Japan)
Ataru Kobayashi, Osaka City Univ. (Japan)

Published in SPIE Proceedings Vol. 8604:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XII
Konstantin L. Vodopyanov, Editor(s)

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