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Single-cycle terahertz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in
4.S. Leinß, T. Kampfrath, K. v. Volkmann, M. Wolf, J. T. Steiner, M. Kira, S. W. Koch, A. Leitenstorfer, and R. Huber, Phys. Rev. Lett. 101, 246401 (2008).
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13.J. Hebling, G. Almási, I. Z. Kozma, and J. Kuhl, Opt. Express 10, 1161 (2002).
17.Note that of 1, of 780 nm, of 2.23, and of 5.16 are used for the calculation in Fig. 2 (Ref. 18).
20.An EO signal measured by balanced photodetectors was calibrated to electric field amplitude with the formula [see Q. Wu and X.-C. Zhang, Appl. Phys. Lett. 71, 1285 (1997)];
20.for the GaP detection crystal used here, the refractive index [see Handbook of Optical Constants of Solids, edited by E. D. Palik (Academic, London, 1985)];
20.the thickness . Fresnel transimission coefficients for the GaP crystal surface and for the Si wafer were used.
21.M. Reid and R. Fedosejevs, Appl. Opt. 44, 149 (2005).
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Using the tilted-pump-pulse-front scheme, we generate single-cycle terahertz (THz) pulses by optical rectification of femtosecond laser pulses in . In our THz generation setup, the condition that the image of the grating coincides with the tilted-optical-pulse front is fulfilled to obtain optimal THz beam characteristics and pump-to-THz conversion efficiency. By using an uncooled microbolometer-array THz camera, it is found that the THz beam leaving the output face of the LN crystal can be regarded as a collimated rather than point source. The designed focusing geometry enables tight focus of the collimated THz beam with a spot size close to the diffraction limit, and the maximum THz electric field of 1.2 MV/cm is obtained.
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