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Proceedings Paper

Coherent electro-optical detection of THz-wave generated from synchronously pumped picosecond THz parametric oscillator
Author(s): Yuma Takida; Tatsuya Ohira; Yuzuru Tadokoro; Hiroshi Kumagai; Shigeki Nashima
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Paper Abstract

Terahertz (THz) radiation via parametric down-conversion of optical pulses in a nonlinear optical crystal is an attractive way to develop frequency tunable THz-wave sources. Therefore, we have focused on developing low-laser-powerpumped THz-wave parametric sources and then successfully demonstrated a synchronously-pumped picosecond THz parametric oscillator (TPO) in pump-enhanced idler-resonant cavity with a bulk 5 mol% MgO-doped lithium niobate (MgO:LN) crystal. In this paper, toward coherent electro-optical (EO) detection of THz waves generated from our synchronously pumped picosecond TPO, we reported time-domain measurements of the THz electric fields using a bowtie- shaped low-temperature grown gallium arsenide (LT-GaAs) photoconductive (PC) antenna as a THz detector. As a result, we obtained temporal waveforms of the THz electric pulses, for the different number of Si-prism couplers, and then found that the radiated THz waves separated multiple unanticipated pulses by use of the arrayed-prism coupling technique. Also, we compared the time-domain system with a Fourier transform Michelson interferometer using a highresistance silicon (Si) beam splitter, from the some viewpoints. The present results reveal great prospects for the realization of THz spectroscopy and imaging applications using our THz-wave source.

Paper Details

Date Published: 15 February 2012
PDF: 6 pages
Proc. SPIE 8240, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XI, 82400A (15 February 2012); doi: 10.1117/12.907824
Show Author Affiliations
Yuma Takida, Osaka City Univ. (Japan)
Tatsuya Ohira, Osaka City Univ. (Japan)
Yuzuru Tadokoro, Osaka City Univ. (Japan)
Hiroshi Kumagai, Osaka City Univ. (Japan)
Shigeki Nashima, Osaka City Univ. (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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