Terahertz wave parametric amplifier

The importance of terahertz (THz) wave techniques has been demonstrated in various fields, and the range of applications is now expanding rapidly. However, the practical implementation of THz science to solve the real-world problems is restricted due to the lack not only of convenient high power THz...

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Bibliographic Details
Published in:Optics letters 2014-03, Vol.39 (6), p.1649-1652
Main Authors: Tripathi, Saroj R, Taira, Yuusuke, Hayashi, Shin'ichiro, Nawata, Kouji, Murate, Kousuke, Minamide, Hiroaki, Kawase, Kodo
Format: Article
Language:English
Subjects:
Amplification
Beams (radiation)
Crystals
Gain
Magnesium
Noise levels
Nonlinearity
Optical data processing
Pumps
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Summary:The importance of terahertz (THz) wave techniques has been demonstrated in various fields, and the range of applications is now expanding rapidly. However, the practical implementation of THz science to solve the real-world problems is restricted due to the lack not only of convenient high power THz wave emitters and sensitive detectors but also of efficient quasi-optical active devices such as amplifiers. In this work, we demonstrate the direct amplification of THz waves in room temperature using magnesium oxide-doped lithium niobate (MgO:LiNbO3) crystals as the nonlinear gain medium. The input THz wave is injected as a seed beam along with the pump beam into the nonlinear crystal and it is amplified by the optical parametric process. We report gain in excess of 30 dB with an input THz pulse energy of less than 1 pJ. We believe that this demonstration will contribute to the convenience and further applicability of THz frequency techniques.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.39.001649