Broadband in-line terahertz 2D imaging: comparative study with time-of-flight, cross- correlation, and Fourier transform data processing

Ushakov, A.A.; Chizhov, P.A.; Bukin, V.V.; Savel’ev, A.B.; Garnov, S.V.

Авторы: Ushakov A.A., Chizhov P.A., Bukin V.V., Savel’ev A.B., Garnov S.V.
Журнал: Journal of the Optical Society of America B: Optical Physics
Том: 35
Номер: 5
Год издания: 2018
Издательство: Optical Society of America
Местоположение издательства: United States
Первая страница: 1159
Последняя страница: 1164
DOI: 10.1364/JOSAB.35.001159
Аннотация: Apulsed broadband (from 0.1 to 1.5 THz), in-line, terahertz (THz) time domain electro-optical sampling is applied for the visualization of phase objects by using a large-aperture electro-optical crystal (ZnTe, 1cm× 1cm). The waveforms of the THz pulses are generated in a lithium niobate (LiNbO3) crystal pumped by femtosecond pulses with a tilted amplitude front, and measured by a 2D THz imaging system. This system images the object under study in theTHzrange via a polytetrafluoroethylene (PTFE) lens in the 2f − 2f geometry onto aZnTe crystal and then images the crystal surface on aCMOScamera using electro-optical sampling. Reconstruction of the image in such a scheme is implemented by processing the received 3D spatial-temporal distributions of the THz field in three different ways: (i) by detecting the displacement of the maximum peak position of the THz pulse due to a phase delay in the object under study; (ii) by using a cross-correlation function analysis; and (iii) by a Fourier transformation of a THz waveform and subsequent extraction of the phase difference at each THz frequency. Images of transparent PTFE objects were obtained. Main features of the resulting imaging system are discussed.
Добавил в систему: Ушаков Александр Александрович

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Broadband in-line terahertz 2D imaging: comparative study with time-of-flight, cross- correlation, and Fourier transform data processingстатья

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