Journal
JETP LETTERS
Volume 85, Issue 5, Pages 227-230Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364007050025
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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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