Towards generation of mJ-level ultrashort THz pulses by optical rectification

Details Towards generation of mJ-level ultrashort THz pulses by optical rectification Towards generation of mJ-level ultrashort THz pulses by optical rectification

2011-03-11

arxiv.org/abs/1103.2279v1

Physics

Optics

7 pages, 4 figures

Scientific paper

Optical rectification of ultrashort laser pulses in LiNbO3 by tilted-pulse-front excitation is a powerful way to generate near single-cycle terahertz (THz) pulses. Motivated by various applications, calculations were carried out to optimize the THz peak electric field strength. The results predict THz output with peak electric field strength on the MV/cm level in the 0.3-1.5 THz frequency range by using optimal pump pulse duration of about 500 fs, optimal crystal length, and cryogenic temperatures for reducing THz absorption in LiNbO3. The THz electric field strength can be increased further to tens of MV/cm by focusing. Using optimal conditions together with the contact grating technique THz pulses with 100 MV/cm field strength and energies on the tens-of-mJ scale are feasible.

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