caa a22 4500 445305746 CHVBK 20180317142612.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10762-011-9780-y doi (NATIONALLICENCE)springer-10.1007/s10762-011-9780-y A Method of Calibration of Terahertz Wave Brightness Under Nonlinear-Optical Detection [Elektronische Daten] [G. Kitaeva, S. Kovalev, A. Penin, A. Tuchak, P. Yakunin] A new method is proposed for calibration of the terahertz wave spectral brightness. The method is based on the use of quantum and thermal field fluctuations as intrinsic references under nonlinear-optical detection. Both effective brightness of the thermal fluctuations and temperature of the laser-pumped nonlinear-optical crystal can be measured absolutely within the calibration procedure also. It is shown that the accuracy of the terahertz wave brightness calibration is strongly dependent on the value of the terahertz wave losses in the nonlinear-optical crystal. The scheme of quasi-phase matched terahertz wave detection in periodically poled lithium niobate is considered. Dispersion of the absorption coefficient in the terahertz frequency range is measured by a three-frequency interference method under spontaneous parametric down-conversion for nominally pure and Mg-doped lithium niobate crystals. The influence of the terahertz radiation losses in Mg-doped lithium niobate crystals is estimated. Springer Science+Business Media, LLC, 2011 Terahertz detection nationallicence Radiance calibration nationallicence Spontaneous parametric conversion nationallicence Spectral brightness nationallicence Terahertz absorption nationallicence Kitaeva G. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut Kovalev S. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut Penin A. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut Tuchak A. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut Yakunin P. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/10(2011-10-01), 1144-1156 1866-6892 32:10<1144 2011 32 10762 https://doi.org/10.1007/s10762-011-9780-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10762-011-9780-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kitaeva G. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Kovalev S. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Penin A. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Tuchak A. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 700 1- Yakunin P. Faculty of Physics, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia aut NATIONALLICENCE 773 0- Journal of Infrared, Millimeter, and Terahertz Waves Springer US; http://www.springer-ny.com 32/10(2011-10-01), 1144-1156 1866-6892 32:10<1144 2011 32 10762 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer