Abstract
The narrowing and “red” shift of the spectrum of a femtosecond laser pulse due to the high-efficiency transformation to terahertz radiation by means of optical rectification in a LiNbO3 crystal are experimentally observed. These changes are in good agreement with the description of the appearance of the terahertz radiation as the difference-frequency generation and make it possible to determine the energy of terahertz pulses. A photon-number transformation coefficient larger than 50% is obtained.
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Original Russian Text © A.G. Stepanov, A.A. Mel’nikov, V.O. Kompanets, S.V. Chekalin, 2007, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2007, Vol. 85, No. 5, pp. 279–282.
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Stepanov, A.G., Mel’nikov, A.A., Kompanets, V.O. et al. Spectral modification of femtosecond laser pulses in the process of highly efficient generation of terahertz radiation via optical rectification. Jetp Lett. 85, 227–230 (2007). https://doi.org/10.1134/S0021364007050025
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DOI: https://doi.org/10.1134/S0021364007050025