21 February 2011 Terahertz generation with tilted-front laser pulses: dynamical theory
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We develop a theory of terahertz emission from a femtosecond laser pulse with tilted intensity front propagating through a prism-shaped electro-optic crystal. The theory accounts for transient effects at the entrance boundary of the crystal and allows us to explore the dynamics of terahertz generation in the crystal. In particular, transverse walk-off length is introduced as an important parameter of the terahertz field formation process. Two typical experimental situations - LiNbO3 excited with Ti:sapphire laser (0.8 μm wavelength) at room and cryogenic temperatures - are considered, and new schemes, in which GaAs is excited at 1.8 and 3.5 μm, are proposed and analyzed. The parameters of the laser pulse (transverse size, tilt angle, and pulse duration) and crystal size maximizing the terahertz yield are calculated.
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M. I. Bakunov, M. I. Bakunov, S. B. Bodrov, S. B. Bodrov, E. A. Mashkovich, E. A. Mashkovich, "Terahertz generation with tilted-front laser pulses: dynamical theory", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79170J (21 February 2011); doi: 10.1117/12.877933; https://doi.org/10.1117/12.877933

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