Abstract
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. Calculations were carried out to optimize the output THz peak electric field strength. The results predict peak electric field strengths 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 focused electric field strength and energies on the tens-of-mJ scale are feasible.
Highlights
Optical rectification (OR) of femtosecond laser pulses is an efficient method to generate ultrashort THz pulses
The calculated peak electric field strength of the THz pulses in air immediately after the output surface of the crystal is shown in figure 3(b) for different temperatures as a function of the Fourier-limited pump pulse duration (τ)
Numerical calculations were performed in order to maximize the electric field strength of THz pulses generated by tilted-pulse-front excitation in LN, motivated by various applications
Summary
Optical rectification (OR) of femtosecond laser pulses is an efficient method to generate ultrashort THz pulses. 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.
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