In this Letter, we introduce a new method of estimation of the terahertz (THz) field amplitude. This method uses second-harmonic generation (SHG) in the presence of THz and DC fields in gaseous media. We take into account contributions from both nonionized molecules and free plasma electrons to the nonlinear process of SHG. We analyze the applicability of this method of detection to obtaining correct information on the waveform and amplitude of broadband THz pulses.
© 2014 Optical Society of America
Original Manuscript: April 2, 2014
Revised Manuscript: May 22, 2014
Manuscript Accepted: May 23, 2014
Published: July 3, 2014
Alexander V. Borodin, Mikhail N. Esaulkov, Alexander A. Frolov, Alexander P. Shkurinov, and Vladislav Ya. Panchenko, "Possibility of direct estimation of terahertz pulse electric field," Opt. Lett. 39, 4092-4095 (2014)