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Proceedings Paper

Low-threshold, quasi-cw terahertz parametric amplification in an external ring cavity with an MgO:LiNbO3 Crystal
Author(s): Shingo Maeda; Tatsuya Ohira; Yuma Takida; Hiroshi Kumagai; Shigeki Nashima
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Paper Abstract

The terahertz wave has been attracted recently because of its wide ranging applications in various fields. Since the appearance of a high power near-infrared light source, coherent terahertz waves have been generated successfully using PC antennas, Q-switch Nd:YAG laser or femto second ultrashort pulses laser. Actually, however, there is no tunable and high-reputation terahertz wave source. Then, we have been focusing on picosecond pulsed laser, because picosecond pulsed laser has smaller linewidth than femtosecond pulse and higher-reputation than Q-switch Nd: YAG laser. In addition, picosecond pulses' peak power can be enhanced in a high finesse compact external cavity to overcome the threshold of terahertz parametric generation and oscillation, because the pulse is relatively small spatially, and the spectrum is relatively narrow. Therefore, we developed a terahertz parametric generator with an MgO-doped LiNbO3(MgO: LN) nonlinear crystal in an external ring cavity for the enhancement. Moreover, the generated idler light was recycled in the ring cavity to provide a contribution to parametric oscillation. As a result, we obtained terahertz wave radiation at high-reputation of 80MHz.

Paper Details

Date Published: 21 February 2011
PDF: 8 pages
Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79171P (21 February 2011); doi: 10.1117/12.874333
Show Author Affiliations
Shingo Maeda, Osaka City Univ. (Japan)
Tatsuya Ohira, Osaka City Univ. (Japan)
Yuma Takida, Osaka City Univ. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)
Shigeki Nashima, Osaka City Univ. (Japan)

Published in SPIE Proceedings Vol. 7917:
Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X
Konstantin L. Vodopyanov, Editor(s)

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