Abstract
Terahertz waves are generated using a femtosecond laser pulse in a periodically poled stoichiometric lithium tantalate crystal and simultaneously detected via a non-collinear optical parametric interaction inside the same crystal. Real time up-conversion signal between the generated THz and an optic probe pulses is measured depending on the beam overlapped conditions using a general silicon-photodiode for the THz detection. The non-collinear geometry is to facilitate manipulated property of the position-dependent bandwidth at narrow and broad bandwidths of 45 GHz and 3.3 THz, respectively at the one crystal. Furthermore, an aperture effect at the detection part is characterized as the function of size and position owing to the spatial distribution of the frequency conversion signal and it is applied in optimization of the in-situ detection scheme.
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Acknowledgements
This research was partially supported by the National Research Foundation (NRF) of Korea funded by the Ministry of Education, Science and Technology (R15-2008-006-02001-0), (No. 2010-0009146) and also by the Asian Laser Center Program provided by the GIST. Author (N. E. Yu) was also partially supported by the Happy tech. program through the NRF (No. 2011-0020956).
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Lee, KS., Ko, DK., Takekawa, S. et al. Characterization of in-situ terahertz detection by optical interaction in a periodically poled stoichiometric lithium tantalate nonlinear crystal. J Infrared Milli Terahz Waves 35, 833–839 (2014). https://doi.org/10.1007/s10762-014-0091-y
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DOI: https://doi.org/10.1007/s10762-014-0091-y